Excellent visual and explanation..Thank you...I especially appreciate the explanation of the home user vs enterprise regarding 1 Gb connection and SHR.. That really helps me..since I'm a home user..
Your videos are the greatest! Thank you for sharing your knowledge and breaking down the NAS information so simple that almost anyone can understand it. Keep up the good work.
Ever since I learned what SHR-1 and SHR-2 were, I moved from RAID10 to them and I've never had any disturbance at all. The best choice is the economic one for SHR. I suggest using 1 slot for Hot spare too, or if you're like me, an inactive HS meaning a disk that is waiting to be used and is 'Not in use' at this time so that if you're on your trip you can repair the pool manually.
Great explanation of SHR, thanks a lot! Two follow-up suggestions/questions: 1. How does the rebuild process/logic works when a faulty drive is being replaced under SHR? What is the impact on rebuild speed/time (which seems to be faster for SHR than for RAID)? Will there be any differences in rebuild speed/time depending on which specific drive failed in the SHR array? --> I guess that rebuild time for faulty 6TB drive (only 1 "sub-array" or Group on it) will be faster than rebuild time for faulty 16TB drive (total of 3 separate "sub-arrays" or Groups on it) --> But in general, how does rebuild time relate to single drive / total array capacity? Is rebuild time for first SHR group of 5x 6TB partitions the same as rebuild time for RAID 5 array of 5x 6TB partitions? And what is rebuild time for an array of 3x or 4x 6TB partitions vs an array of 5x 6TB partitions? 2. Based on point 1 above, it would be great to use the same Excel-based approach to explain what happens when, starting from an existing SHR setup: SCENARIO A. We replace one of the 6TB drives by a new drive of lower capacity than largest 16 TB drive (but larger than 6TB). My guess at how the process works, but would be interested in this being confirmed: --> SHR identifies which existing sub-arrays/groups are impacted by the swap (here only Group 1) --> SHR uses parity info on remaining disks to rebuild ONLY the impacted groups that were present on old drive --> SHR checks whether addition of new drive allows for creation of additional group/sub-array on top of existing ones (not in this case, but why? Does it have to make with SHR only being able to apply partition scheme of either old 6 TB drive or largest 16 TB drive to the new drive?) --> Hence no increase in available SHR capacity SCENARIO B. We replace one of the 6TB drives by a new 14TB drive of (lower capacity than largest 16 TB drive, but higher capacity than second largest 12 TB drive) --> Why extra 2 TB on two largest drives not exploitable by SHR for capacity expansion? Like in Scenario A abvove, does it have to make with SHR only being able to apply partition scheme of either old 6 TB drive or largest 16 TB drive to the new drive? SCENARIO C. We replace one of the 6TB drives by a new 16TB drive (same capacity as largest drive & corresponding increase in available SHR capacity) --> What happens to Groups 2 & 3 sub-arrays? Is extra capacity available on new 16 TB drive used for their benefit as well, i.e. adding one extra drive to each sub-array?
Very detailed. I’m lazy and just use Synology’s disk calculator to see how much upgrades will work. Have DS1821+. Was filled with 4TB IW Pro’s, SHR-2. Just put in 4 Exos 16TB drives. Gained 24 additional storage. More than enough for my needs for now. Keep up the amazing videos.
Good video, one thing I might of missed, if you explained it, from the tutorial is that SHR can only handle you installing the same size or larger disks in your array. so if you have a 3*8TBs and then buy 2*4TBs you have to rebuild the array from scratch to use smaller drives. I almost missed this cavaet when I setup my SHR configuration. TL;DR start with the smallest drives your liable to put in the array first.
Hi, great explanation. In your example, you have 3 different partitions for your SHR pool. What if you gradually replace the 6TB, 8TB, and 12TB drives with 16TB drives, will the 3 partitions still exist across those drives as well, or will it reconfigure to 1 single partition with a single parity drive, and therefore perform as well as the RAID 5 pool?
I have a question. This video does an awesome job explaining the differences between SHR vs RAID for setup. I have purchased my first NAS, a DS1522+, along with three 12TB Iron Wolf Pro NAS disks. When I fill the other slots on my NAS, I plan on adding two more 12TB, or I might increase to 16TB or 20TB if I need the space at that time. Knowing this, is it still best to install SHR1 or should I install RAID 5? Is SHR1 still the best choice?
very good explanation, appreciate the quality video. will probably use SHR in my home NAS setup instead of RAID5, even though I don't plan on upgrading in the future, but you never know!
Good choice! Back in the days when I got my first NAS I went with RAID5 and did not intent to increase storage. But guess what: After 5 years I ran out of space. I could not afford to buy 4 new HDs. Therefore I moved all the data to a NAS of a friend and converted my own NAS to SHR1. Now over the last 10 years I replaced every drive that’s damaged with whatever HD I can buy for around 100€ at that time. Thereby, thanks to SHR1, my storage increases stepwise with my needs without a lot of additional costs.
@SpaceRex Thanks a lot for your helpful videos, you helped me chose which device to buy (DS923+). One question: If I add 4x 4TB drives with SHR, how is it posible that a single 4TB drive is used to "backup" the rest of my data (12TB)? Or did I misunderstand? Thanks in advance!
Hey Will! GREAT videos, I have watched and learned a TON. Thank you! My ds1621xs+ arrives soon. I am filling it with all 16tb drives. Would you recommend the SHR1 or Raid 5. I understand that the SHR1 would allow for expansion easier, but if I have it fully populated with 16tb drives, is there any point? Thanks again!
Hello, I am coming from an old QNAP 2 bay NAS with 2x 6TB disks which are now full. My consideration is the following: If I buy a 4 bay Synology NAS and another 6TB disk, the raid calculator for SHR shows an available space of 12TB and a space for security of 6TB. Can this be correct, that for 12TB of data, 6TB of security is sufficient? Excuse my bad English, many greetings from Germany!
So in the case of a two bay (220+). If I start out with a 4TB and 6TB with SHR1, I will have a 4TB storage pool with 2TB of wasted space. Farther on down the line, if I replace the 4TB with a 6TB then I can have a 6TB storage pool with no wasted space...correct? Thanks for the video.
Excellent Video.. However, toward the end, I did not understand how you could only get 4 TB increase when you added two 8 TB drives to an SHR that already contained five 4 TB drives... Somebody care to answer?
whats the real difference between shr2 and raid10? if i cannot afford to have a nas backup for some months, with a 4 bay nas, should shr2 will be more safer bet or raid10 to protect data loss in case of failure?
Thanks for the explanation. I have a question. For example, I have a 4T and a 2T drive with SHR2 setup, and 4T of data is in it. Now if the 4T drive dies, it is impossible for the 2T drive to have 4T of data. But if the 2T drive dies, will there be any data loss?
So you could not have an SHR2 setup with this, as SHR2 requires 3 disks min. If it was an SHR1 setup you would only have 2TB of usable data as SHR takes the largest drive for space redundancy
@@SpaceRexWill Thanks for the quick reply! In this case, is it possible to use half of the 4T drive as a mirror of the 2T drive and store important data (which can be recovered if one of the drives fails), and then use the rest of the 4T to store some less important data?
I have a shr with 6tb and 10tb hdd in my Synology 2 bay nas. My 6tb hdd is failing, i am planning to replace it with amother 10 hdd. Would it mean i will now have she capacity based on 6td failing drive or she will rebuild based on 10td and I will have closer to 10tb capacity. Please let me know.
Thanks for this video man! I'm wondering if SHR is still fast enough to edit 6k video... (mid 2017 iMac, specced out, Resolve) I'm also planning to use 10gbe. But maybe I should be looking at Thunderbolt 3 drives... hmm. EDIT: Well cool, I'm about to check out your more recent video on using a Synology for video editing. Hopefully you talk about SHR a bit. 🙂
Hi, great info indeed. But sir i would like to get help regarding my files that were overwritten by ou old nas to new nas :( i don't know where and what to do😢
This is off topic, but I have a DS718+ with Raid1 and still has ext3 file system (when I migrated from my DS210+ I don’t remember if it asked for ext4 or BTRFS. I don’t see any problems and even experienced a HD failure. It rebuilt the system perfectly. My question: I have a complete USB backup. Do I leave #1 drive in and install ext4 on the new drive? Then replace #1 with the new ext4 drive and perform a restore? There’s no info on ext3 to ext4 and the videos I see have me create a new NAS setup. I still want my static ips and all packages. Will this work? Thank you Tom
Yeah I guess so. Maybe it is keeping the old deleted things???? that's the only thing I can think. It should be smaller if anything with compression and dedup
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I believe RAID means “Redundant Array of Independent Disks” (and not “Inexpensive”)… or I’m wrong?
Hey, thank you for sharing your knowledge. I have an old qnap and you made me want to go synology... I've already choose the ds1621+ and am going to use with 4 18tb hdd's for now and plan to add another 2 18tb in the future... From what I've learned I'm going raid5 which I believe will be better in this case... Now I just don't know what file system to choose and will give better performance... What do you think?
I should probably ask Synology this question but maybe I can get a better answer here. Using SHR in an 8 bay NAS with a max capacity of 48TB I'm curious if I'm missing something. Per the Synology calculator if I use 2 drives at 12TB and 6 drives at 4 TB it adds up to 48 TB with 12TB for parity and 36TB useable. With 8 drives at 6TB its the same 48TB but only 6 TB for parity giving 42TB useable space. Do I end up with additional fault tolerance due to the additional 6 TB in the first scenario? The calculator shows no "wasted" space as it does with other potential configs. Cost is about $9/TB better on the scenario with 8 drives at 6TB. Given this info and having an above average concern for data loss, what would you do?
You do not end up with any additional fault tolerance. In both scenarios its simply the largest disk in the pool that is used for parity, allowing you to loose any single disk. the reason that the 12 TB scenario has 12 TB of parity the parity section has to be as large as the largest disk to ensure that if that largest disk fails, all the data on it is also in parity
oof, I have various size HDD also -- no wonder. How do I change my HDs in the DS1522+ from RAID5 to SHR? What's the easiest way to back up the HDs so I can make the change to SHR -- onto portable drives? I'm guessing I'll have to swipe the HDs clean and reconfigure all over again? thnx.
Well... I have been storing my photo data of years on a Synology NAS 1515+, and I think I selected Synology's method of a RAID, something like a + 1 drive, likely SHR?.. or something I am not remembering so well..But it is 1 disk fault tollerant. Unfortunately my $900 5 drive NAS had hardware issues(risistors, transistors, CPU bug, PSU). Out of warranty , I had to repair it without Synology assistance at all! Boo Synology!! I had to take out the drives. to do so. Now that its all up and running......Guess what? I mixed up the order of how I took them out!!! What can I do to put the drives back into the NAS without messing up my data? Does it simply not boot? And I have to keep trying until its correct, or??? Do I need to open up a PC box and start connecting the drive to read some info on the drive to ID its orders? (Well explained btw! Good delivery, and explanation)
I have DS 920+ with 4 HDD- 10 TB each which one is best. HOME purpose i am going to read and write from multiple laptops and Phones- Video/pics/files etc. If I use SHR-1 can i update only one disk at a time for ex 16 one 10 remaining 3. Will it be possible. Please advice your video was awesome thanks a lot
So SHR-1 will allow you to slowly upgrade if that is the question you are asking. The first new drive you add will not get you any storage increase (as it will now be the largest) but from there you will get an additional 6TB (10->16TB) for each drive you upgrade
Hi NAS Noob here. I've recently bought DS1522+ for video storage and editing off. I bought all the extras SDs for cache and 10Gb connection. I currently have 5 8TB NAS drives for the machine. I was going to set up as SHR1 but I understand from this i wouldnt be able to take advanatage of the 10GB connection for editing through the NAS if set up on SHR1, I would have to instead use RAID 5 to make use of the 10GB connection. This is annoying as down the line I would like to buy the extension block for this machine and fill it with larger 16tb drives. My NAS sits on my desk and I wanted to connect directly to Mac studio and edit of that. Is this possible in SHR1 or do I go RAID 5?
This would not work the way you expect it to. SHR is simple. It takes the largest drive. In your case that’s the 12TB which means you would have 9 TB usable. But if you have 4x 3TB drives SHR would take a 3 TB drive and you also would have 9 TB
So, if I understood this correctly: If you had all the disks of the same size, the read/write speed of the SHR1 and RAID5 configurations would be virtually identical, since there is only one "partition" of RAIDing and all the drives are used for each file. Is this correct? - Eero
What if your Synology hardware fails and you're using SHR? Means your data is inaccessible unless you replace your Synology hardware with new Synology Hardware. If using RAID, you'd have more options on your next NAS solution.
@@SpaceRexWill Oof, so you mean I can't really recover my RAID 5 data should my Synology NAS fail and I switch to an alternative NAS maker, I need Synology tools to recover it?
Hi Rex I have the Synology 720+ I am wondering if I chose SHR will I be able to install a larger drive later? I have two 4TB right now and would like to upgrade in the future adding 8TB to one side then being able to upgrade the other side to another 8TB once I'm able to afford it. I would like to do this with out having to dumb the nas to my PC. I just went thru that to get the 4TB installed from 2TB
@@SpaceRexWill So if you have 10g connection and all same size drives, SHR is good, but if you're using different size drives it's better for RAID? Building out my first NAS and want to make sure I'm on the right track! Really appreciate all your content!
I have a 2-bay with the same HDD using SHR1. I had wanted redundancy in case one of my drive fails to protect my photos. Why shouldn't I just configure the drives as RAID0 and then use an inexpensive external USB 3.0 backup drive for periodic backup? That would increase my total storage and I'll have a removable backup drive. Just wanted to hear your thoughts. thanks
I have a 6 bay SHR configuration with 2x 16TB Iron Wolf drives in it. I have 4x 8TB Barracuda drives I would like to add to my SHR configuration. Is this possible or can I only add another 16TB drives or larger?
I am upgrading my DS718+II to a DS918+. I am currently using SHR on the 718+II. What is the best file structure to use on the 918+. I plan on moving the 2 8TB drives on the 718+II in the new 918+ and adding 2 more 8TB for a total of 4 8TB drives. Thanks in advance for any help.
Thanks for yo0ur timely response. If I understand correctly I migrate my two 8TB drives to my 918+ using Synology Migration and after that process is complete then add my 2 new hard drives as drive 3 and 4 and let DSM reconfigure the array as a SHR of 4 drive. Am I correct?
So I have a DS920+ and I have 2x12TB drives in there with 2x12TB due at the weekend, so in total I will have 4x12TB. Is there any downside to me to use SHR over RAID-5 please? I assume they will be identical, but more futureproof if i were to add in 2 higher drives at some point ( No I can't imagine I will either :-) )
@@SpaceRexWill Cheers, much appreciated :-) I don't suppose you have a done a tutorial on the USB Copy options by any chance have you? At this point I have multiple large portable drives that i would like to get on to the NAS, mainly so I can consolidate them all, but then want to be able to clear some of those portables and use them as a backup for the data that is on the NAS. At that point, I think I will find differential backups to be the most useful.
I got a ds218+ with only one 4TB installed. I want to install a second 8TB. When the 4TB is full it shouldn't be a problem replacing it with another 8TB correct ??
100% SHR. RAID10 is not necessary for anyone but very specific enterprise users who need to be able to have crazy up time and performance with spinning disks. You will see no benefit from RAID10 with the 920+
I needed to replace a HD in one of my servers and trusted this video to increase my SHR Volume (5x8TB), and it failed. I installed a 10 TB HD in one slot, trusting the recommendation that Synology would then allow me to expand the volume size by the delta of this one replaced HD in SHR, which is what I have installed on this server, but it did NOT. The DSM didn't give me the option of increasing the volume size. After the "repair" stage, it just let me add the new drive to the existing volume as if it were a 4 TB drive.
That is because you added one single disk. As I said here SHR takes the largest disk for redundancy. Therefore since the 10TB drive was now the largest it was used for redundancy. If you add another drive it will work
@@SpaceRexWill ah, I see. I completely did not take that away from the video. I'll listen to it again, but I interpreted this very differently. My first setup already HAD that redundancy, so I falsely assumed the rest would be recognized. In any event, thank you very much for clarifying. Your videos are very informing, and the example you did in Excel to show the raid differences was very helpful.
I have the DS920+. I have 3 x 14TB disks. I wanted to do the SHR-1 Raid 5 but I was told if the controller hardware fails all the disks will be screwed. Is this true? Does the controller contain any raid information on there which will ruin the whole 3 x 14TB disks? Therefore apart from the 1 disk failure is there any other single point of failures on the DS920+ I should be aware of ? Urgent!!!
whoever told you the controller hardware existed is wrong. There is no hardware controller in a Synology, only software. If the cables fail then the pool offline and you should be fine to restore. But still have a backup of your critical data
@@SpaceRexWill So if I use RAID 5 instead of RAID 1, apart from being able to lose 1 disk is it totally unstable to use RAID 5. What are the single point of failures apart from losing more than 1 disk? Does any of the RAID information get stored anywhere else apart from the disks? Any other downside to using RAID 5?
Does anybody have a way to read an SHR RAID drive with a USB external hard drive enclosure? It shows up in device manager and disk management, but it doesn't come up as a drive in windows explorer. Is there a way to do that?
SpaceRex thanks buddy! I swear you answer comments note than any other tech TH-camr around, absolutely love your videos and you make some fairly complex concepts really understandable
So that is what I did and I actually regret not going with SHR1. if you have all equal disks SHR1 is RAID5 under the hood. But with SHR you get to add larger disks later
i prefer 1 on site raid 0 and 1 offsite raid 0, bcz no matter how many raid or shr u use if thr is power surge or smthing else happn who knows what u r doomed
So no advantage of your drives are the same and you have no need to expand. If anything data recovery from a SHR can be much more convoluted then a hardware raid1. In the event of a nas failure and you need to get data from a SHR volume, you appear to need all the disks from the array. Doesn't this mean you don't have redundancy... www.synology.com/en-global/knowledgebase/DSM/tutorial/Storage/How_can_I_recover_data_from_my_DiskStation_using_a_PC
", you must install all the drives (excluding hot spare drives) in your PC at the same time". My hardware raid1, I didn't need to do any of that, it was just a regular ext4 volume I could copy from **ANY** of the drives in the array.
So that is just explaining to the user to make sure to include all of the drives. If you had three drives in SHR you would have a RAID 5 (basically) meaning you would have to have two of the drives. But instead they explain it as “add all the drives” for simplicity. If you have RAID1 with a 2 drive bay it’s honestly not worth SHR as you can’t expand
no it's not outputting. it's rather better than just regular cut. If you think pauses is weird, try to record video to a camera yourself without pausing or forgetting what the beginning of your sentence was :D
Does SHR affect performance when running with all same size disks vs RAID? For example, if I have a 2-Bay Synology with two same-size disks, can I pick SHR for future-proofing and not worry about any performance-impacting overhead?
![[Full] 4 ต่อ 4 Celebrity EP.920 | 3 พ.ย. 67 | one31](http://i.ytimg.com/vi/KwiW2M_kAg4/mqdefault.jpg)
Excellent visual and explanation..Thank you...I especially appreciate the explanation of the home user vs enterprise regarding 1 Gb connection and SHR.. That really helps me..since I'm a home user..
Your videos are the greatest! Thank you for sharing your knowledge and breaking down the NAS information so simple that almost anyone can understand it. Keep up the good work.
Ever since I learned what SHR-1 and SHR-2 were, I moved from RAID10 to them and I've never had any disturbance at all. The best choice is the economic one for SHR. I suggest using 1 slot for Hot spare too, or if you're like me, an inactive HS meaning a disk that is waiting to be used and is 'Not in use' at this time so that if you're on your trip you can repair the pool manually.
Great explanation of SHR, thanks a lot!
Two follow-up suggestions/questions:
1. How does the rebuild process/logic works when a faulty drive is being replaced under SHR? What is the impact on rebuild speed/time (which seems to be faster for SHR than for RAID)? Will there be any differences in rebuild speed/time depending on which specific drive failed in the SHR array?
--> I guess that rebuild time for faulty 6TB drive (only 1 "sub-array" or Group on it) will be faster than rebuild time for faulty 16TB drive (total of 3 separate "sub-arrays" or Groups on it)
--> But in general, how does rebuild time relate to single drive / total array capacity? Is rebuild time for first SHR group of 5x 6TB partitions the same as rebuild time for RAID 5 array of 5x 6TB partitions? And what is rebuild time for an array of 3x or 4x 6TB partitions vs an array of 5x 6TB partitions?
2. Based on point 1 above, it would be great to use the same Excel-based approach to explain what happens when, starting from an existing SHR setup:
SCENARIO A. We replace one of the 6TB drives by a new drive of lower capacity than largest 16 TB drive (but larger than 6TB). My guess at how the process works, but would be interested in this being confirmed:
--> SHR identifies which existing sub-arrays/groups are impacted by the swap (here only Group 1)
--> SHR uses parity info on remaining disks to rebuild ONLY the impacted groups that were present on old drive
--> SHR checks whether addition of new drive allows for creation of additional group/sub-array on top of existing ones (not in this case, but why? Does it have to make with SHR only being able to apply partition scheme of either old 6 TB drive or largest 16 TB drive to the new drive?)
--> Hence no increase in available SHR capacity
SCENARIO B. We replace one of the 6TB drives by a new 14TB drive of (lower capacity than largest 16 TB drive, but higher capacity than second largest 12 TB drive)
--> Why extra 2 TB on two largest drives not exploitable by SHR for capacity expansion? Like in Scenario A abvove, does it have to make with SHR only being able to apply partition scheme of either old 6 TB drive or largest 16 TB drive to the new drive?
SCENARIO C. We replace one of the 6TB drives by a new 16TB drive (same capacity as largest drive & corresponding increase in available SHR capacity)
--> What happens to Groups 2 & 3 sub-arrays? Is extra capacity available on new 16 TB drive used for their benefit as well, i.e. adding one extra drive to each sub-array?
still unanswered.
Very detailed. I’m lazy and just use Synology’s disk calculator to see how much upgrades will work. Have DS1821+. Was filled with 4TB IW Pro’s, SHR-2. Just put in 4 Exos 16TB drives. Gained 24 additional storage. More than enough for my needs for now.
Keep up the amazing videos.
Good video, one thing I might of missed, if you explained it, from the tutorial is that SHR can only handle you installing the same size or larger disks in your array.
so if you have a 3*8TBs and then buy 2*4TBs you have to rebuild the array from scratch to use smaller drives.
I almost missed this cavaet when I setup my SHR configuration.
TL;DR start with the smallest drives your liable to put in the array first.
Very good point!
Fantastic Explanation, just about to purchase my first NAS and you answered all my questions in this video. thx.
Hey thanks!
Excellent video. Wish I had watched this one before I decided on RAID 5. Keep it up!
Best video on the topic I have seen yet. Thanks!
Nice video as always! I like the simple but knowledgeable explanations etc.
That was a great explanation of SHR, thanks!
The excel math made this video soooo worth it
Hi, great explanation. In your example, you have 3 different partitions for your SHR pool. What if you gradually replace the 6TB, 8TB, and 12TB drives with 16TB drives, will the 3 partitions still exist across those drives as well, or will it reconfigure to 1 single partition with a single parity drive, and therefore perform as well as the RAID 5 pool?
Great video! I love SHR, been using it for years.
Yeah its awesome for home use!
I have a question. This video does an awesome job explaining the differences between SHR vs RAID for setup. I have purchased my first NAS, a DS1522+, along with three 12TB Iron Wolf Pro NAS disks. When I fill the other slots on my NAS, I plan on adding two more 12TB, or I might increase to 16TB or 20TB if I need the space at that time. Knowing this, is it still best to install SHR1 or should I install RAID 5? Is SHR1 still the best choice?
This is the setup I’m going for, what did you end up using? I’m thinking that if it’s all 12TB drives then it’s better in a RAID5?
Great point; just because it is on a raid that does not mean it is backed up.
Exactly! with RAID your 'backup' gets corrupted at the exact time a file does!
very good explanation, appreciate the quality video. will probably use SHR in my home NAS setup instead of RAID5, even though I don't plan on upgrading in the future, but you never know!
Good choice! Back in the days when I got my first NAS I went with RAID5 and did not intent to increase storage. But guess what: After 5 years I ran out of space.
I could not afford to buy 4 new HDs. Therefore I moved all the data to a NAS of a friend and converted my own NAS to SHR1. Now over the last 10 years I replaced every drive that’s damaged with whatever HD I can buy for around 100€ at that time. Thereby, thanks to SHR1, my storage increases stepwise with my needs without a lot of additional costs.
Greatly explained, but you forgot to illustrate, that you can more easily recover a raid 5 array on multiple systems instead of the SHR array.
@SpaceRex Thanks a lot for your helpful videos, you helped me chose which device to buy (DS923+). One question: If I add 4x 4TB drives with SHR, how is it posible that a single 4TB drive is used to "backup" the rest of my data (12TB)? Or did I misunderstand? Thanks in advance!
awesome work ! I followed your videos to setup my ds220+.
Glad I could help!
Hey Will! GREAT videos, I have watched and learned a TON. Thank you! My ds1621xs+ arrives soon. I am filling it with all 16tb drives. Would you recommend the SHR1 or Raid 5. I understand that the SHR1 would allow for expansion easier, but if I have it fully populated with 16tb drives, is there any point? Thanks again!
You will not have shr1 there. Xs doesn’t support it.
Hello, I am coming from an old QNAP 2 bay NAS with 2x 6TB disks which are now full. My consideration is the following: If I buy a 4 bay Synology NAS and another 6TB disk, the raid calculator for SHR shows an available space of 12TB and a space for security of 6TB. Can this be correct, that for 12TB of data, 6TB of security is sufficient?
Excuse my bad English, many greetings from Germany!
The best explanation! Thanks a lot
Thank you, great explanation 👍🏼👍🏼
Great job bro. This has really helped.
Awesome! Thank you for the clarification.
Great explanation!!
So in the case of a two bay (220+). If I start out with a 4TB and 6TB with SHR1, I will have a 4TB storage pool with 2TB of wasted space. Farther on down the line, if I replace the 4TB with a 6TB then I can have a 6TB storage pool with no wasted space...correct? Thanks for the video.
Very good explanation. I got it now.
Excellent Video.. However, toward the end, I did not understand how you could only get 4 TB increase when you added two 8 TB drives to an SHR that already contained five 4 TB drives... Somebody care to answer?
He made a mistake thats the answer. to get 4 TB you just add one 4TB drive
Great explenation. Thank you SHR for the win.
whats the real difference between shr2 and raid10? if i cannot afford to have a nas backup for some months, with a 4 bay nas, should shr2 will be more safer bet or raid10 to protect data loss in case of failure?
Honestly with 4 Bays SHR1 is going to be enough. SHR2 would probably be overkill as hd rebuild times are not that long with 4 bays
Thanks for the explanation. I have a question. For example, I have a 4T and a 2T drive with SHR2 setup, and 4T of data is in it. Now if the 4T drive dies, it is impossible for the 2T drive to have 4T of data. But if the 2T drive dies, will there be any data loss?
So you could not have an SHR2 setup with this, as SHR2 requires 3 disks min.
If it was an SHR1 setup you would only have 2TB of usable data as SHR takes the largest drive for space redundancy
@@SpaceRexWill Thanks for the quick reply! In this case, is it possible to use half of the 4T drive as a mirror of the 2T drive and store important data (which can be recovered if one of the drives fails), and then use the rest of the 4T to store some less important data?
You cannot
I have a shr with 6tb and 10tb hdd in my Synology 2 bay nas.
My 6tb hdd is failing, i am planning to replace it with amother 10 hdd. Would it mean i will now have she capacity based on 6td failing drive or she will rebuild based on 10td and I will have closer to 10tb capacity. Please let me know.
So what happens if I remove a small drive from a fully utilised array and replace it with a larger one; say in the start position of the bays ?…
Thanks for this video man! I'm wondering if SHR is still fast enough to edit 6k video... (mid 2017 iMac, specced out, Resolve) I'm also planning to use 10gbe. But maybe I should be looking at Thunderbolt 3 drives... hmm.
EDIT: Well cool, I'm about to check out your more recent video on using a Synology for video editing. Hopefully you talk about SHR a bit. 🙂
Very helpful 👍🏼 thx
Hi, great info indeed. But sir i would like to get help regarding my files that were overwritten by ou old nas to new nas :( i don't know where and what to do😢
This is off topic, but I have a DS718+ with Raid1 and still has ext3 file system (when I migrated from my DS210+ I don’t remember if it asked for ext4 or BTRFS. I don’t see any problems and even experienced a HD failure. It rebuilt the system perfectly. My question: I have a complete USB backup. Do I leave #1 drive in and install ext4 on the new drive? Then replace #1 with the new ext4 drive and perform a restore? There’s no info on ext3 to ext4 and the videos I see have me create a new NAS setup. I still want my static ips and all packages. Will this work?
Thank you
Tom
SHR has its caveats. Because it handles everything for you, the needed processing power is greater and the read/write perfs pretty bad.
Tutorial suggestion: How to clean up a Hyperbackup drive. My 5TB drive is full, despite me only backing up a 4TB drive without any versioning.
Without any versioning??? That makes no since!
@@SpaceRexWill I know, right? Not sure what's going on. I guess I'll have to wipe the back up drive and start from scratch again 😕
Yeah I guess so. Maybe it is keeping the old deleted things???? that's the only thing I can think. It should be smaller if anything with compression and dedup
I believe RAID means “Redundant Array of Independent Disks” (and not “Inexpensive”)… or I’m wrong?
Both are true
Hey, thank you for sharing your knowledge. I have an old qnap and you made me want to go synology...
I've already choose the ds1621+ and am going to use with 4 18tb hdd's for now and plan to add another 2 18tb in the future...
From what I've learned I'm going raid5 which I believe will be better in this case... Now I just don't know what file system to choose and will give better performance...
What do you think?
So hands down I would go BTRFS. The features that it has makes it a complete game changer
@SpaceRex is it reliable with raid5? I'm a photographer, will edit from the nas but it's mainly for storage and mobile phone uploads too...
Yes BTRFS is going to be more reliable as it has checksums for your data to prevent bit rot over time
I should probably ask Synology this question but maybe I can get a better answer here. Using SHR in an 8 bay NAS with a max capacity of 48TB I'm curious if I'm missing something. Per the Synology calculator if I use 2 drives at 12TB and 6 drives at 4 TB it adds up to 48 TB with 12TB for parity and 36TB useable. With 8 drives at 6TB its the same 48TB but only 6 TB for parity giving 42TB useable space. Do I end up with additional fault tolerance due to the additional 6 TB in the first scenario? The calculator shows no "wasted" space as it does with other potential configs. Cost is about $9/TB better on the scenario with 8 drives at 6TB. Given this info and having an above average concern for data loss, what would you do?
You do not end up with any additional fault tolerance. In both scenarios its simply the largest disk in the pool that is used for parity, allowing you to loose any single disk. the reason that the 12 TB scenario has 12 TB of parity the parity section has to be as large as the largest disk to ensure that if that largest disk fails, all the data on it is also in parity
I had ds423+ with single 8TB HDD, later I added a 12TB hdd, however I'm still getting the same storage. Please help
They are likely setup with SHR1 together (they are now mirroring each other)
Thank you so much!
i have DS1522+ with 18Tb+16tb+2tb+2tb+500gb what you recommend for SHR or RAID5 ?
SHR, otherwise every one of your drives will act like they are 500 gb
oof, I have various size HDD also -- no wonder. How do I change my HDs in the DS1522+ from RAID5 to SHR? What's the easiest way to back up the HDs so I can make the change to SHR -- onto portable drives? I'm guessing I'll have to swipe the HDs clean and reconfigure all over again? thnx.
Well...
I have been storing my photo data of years on a Synology NAS 1515+, and I think I selected Synology's method of a RAID, something like a + 1 drive, likely SHR?.. or something I am not remembering so well..But it is 1 disk fault tollerant.
Unfortunately my $900 5 drive NAS had hardware issues(risistors, transistors, CPU bug, PSU). Out of warranty , I had to repair it without Synology assistance at all! Boo Synology!!
I had to take out the drives. to do so. Now that its all up and running......Guess what?
I mixed up the order of how I took them out!!! What can I do to put the drives back into the NAS without messing up my data? Does it simply not boot? And I have to keep trying until its correct, or??? Do I need to open up a PC box and start connecting the drive to read some info on the drive to ID its orders?
(Well explained btw! Good delivery, and explanation)
The order should not matter!
@@SpaceRexWill Wow! that will be GREAT!
I have DS 920+ with 4 HDD- 10 TB each which one is best. HOME purpose i am going to read and write from multiple laptops and Phones- Video/pics/files etc. If I use SHR-1 can i update only one disk at a time for ex 16 one 10 remaining 3. Will it be possible. Please advice your video was awesome thanks a lot
So SHR-1 will allow you to slowly upgrade if that is the question you are asking. The first new drive you add will not get you any storage increase (as it will now be the largest) but from there you will get an additional 6TB (10->16TB) for each drive you upgrade
Hi NAS Noob here. I've recently bought DS1522+ for video storage and editing off. I bought all the extras SDs for cache and 10Gb connection. I currently have 5 8TB NAS drives for the machine. I was going to set up as SHR1 but I understand from this i wouldnt be able to take advanatage of the 10GB connection for editing through the NAS if set up on SHR1, I would have to instead use RAID 5 to make use of the 10GB connection. This is annoying as down the line I would like to buy the extension block for this machine and fill it with larger 16tb drives. My NAS sits on my desk and I wanted to connect directly to Mac studio and edit of that. Is this possible in SHR1 or do I go RAID 5?
Can I have 3 bays with 4tb of available space each and the 4th bay of 12tb used for protection? Will this work under the SHR types???
This would not work the way you expect it to. SHR is simple. It takes the largest drive. In your case that’s the 12TB which means you would have 9 TB usable.
But if you have 4x 3TB drives SHR would take a 3 TB drive and you also would have 9 TB
So, if I understood this correctly: If you had all the disks of the same size, the read/write speed of the SHR1 and RAID5 configurations would be virtually identical, since there is only one "partition" of RAIDing and all the drives are used for each file. Is this correct?
- Eero
Exactly, it would be just a single raid5 volume under the hood
@@SpaceRexWill just perfect! 👌 Thanks for the reply.
What if your Synology hardware fails and you're using SHR? Means your data is inaccessible unless you replace your Synology hardware with new Synology Hardware. If using RAID, you'd have more options on your next NAS solution.
So actually both ways Synology makes a custom volume. They also have a SHR client you can download for linux
@@SpaceRexWill Oof, so you mean I can't really recover my RAID 5 data should my Synology NAS fail and I switch to an alternative NAS maker, I need Synology tools to recover it?
Yes, but they have free clients you can download to do it on linux
Hi Rex I have the Synology 720+ I am wondering if I chose SHR will I be able to install a larger drive later? I have two 4TB right now and would like to upgrade in the future adding 8TB to one side then being able to upgrade the other side to another 8TB once I'm able to afford it. I would like to do this with out having to dumb the nas to my PC. I just went thru that to get the 4TB installed from 2TB
Yes you will be able to do this!
Did I understand correctly that if using 10g connection SHR won't be as good a traditional RAID setup?
Only if you have a mixed raid (different disk sizes, you can end up with some weird slow downs. Still worth it though(
@@SpaceRexWill So if you have 10g connection and all same size drives, SHR is good, but if you're using different size drives it's better for RAID?
Building out my first NAS and want to make sure I'm on the right track! Really appreciate all your content!
thanks very much , great info . so i got 1821+ and 8 hards 10 tera , so that mean no difference for me for both ways since they are identical hards
I have ds1821+ and have 8pcs 8tb drive what raid type should I use. thanks a lot
Look at the video.
I have a 2-bay with the same HDD using SHR1. I had wanted redundancy in case one of my drive fails to protect my photos. Why shouldn't I just configure the drives as RAID0 and then use an inexpensive external USB 3.0 backup drive for periodic backup? That would increase my total storage and I'll have a removable backup drive. Just wanted to hear your thoughts. thanks
This is 100% better, RAID is not a backup, it is just used to keep uptime
This guy has got a tiny wee bit of a WHAM look doesn't he? LOL...handsome guy.
In a SHR pool can i replace 2x 4 TB drive by a single 10 TB drive?
You cannot
I have a 6 bay SHR configuration with 2x 16TB Iron Wolf drives in it. I have 4x 8TB Barracuda drives I would like to add to my SHR configuration. Is this possible or can I only add another 16TB drives or larger?
You can only add drives which are the same size or larger than your smallest drive
I am upgrading my DS718+II to a DS918+. I am currently using SHR on the 718+II. What is the best file structure to use on the 918+. I plan on moving the 2 8TB drives on the 718+II in the new 918+ and adding 2 more 8TB for a total of 4 8TB drives. Thanks in advance for any help.
You should be able to just transfer the drives over and it will all work!
Thanks for yo0ur timely response. If I understand correctly I migrate my two 8TB drives to my 918+ using Synology Migration and after that process is complete then add my 2 new hard drives as drive 3 and 4 and let DSM reconfigure the array as a SHR of 4 drive. Am I correct?
thank you!
So I have a DS920+ and I have 2x12TB drives in there with 2x12TB due at the weekend, so in total I will have 4x12TB. Is there any downside to me to use SHR over RAID-5 please? I assume they will be identical, but more futureproof if i were to add in 2 higher drives at some point ( No I can't imagine I will either :-) )
I would go for SHR. It has now been well tested and it does give you that future upgrade ability!
@@SpaceRexWill Cheers, much appreciated :-) I don't suppose you have a done a tutorial on the USB Copy options by any chance have you? At this point I have multiple large portable drives that i would like to get on to the NAS, mainly so I can consolidate them all, but then want to be able to clear some of those portables and use them as a backup for the data that is on the NAS. At that point, I think I will find differential backups to be the most useful.
I got a ds218+ with only one 4TB installed. I want to install a second 8TB. When the 4TB is full it shouldn't be a problem replacing it with another 8TB correct ??
if you use SHR yes this should be fine
thank u 🤟
I have a 920+ for home and still trying to decide between SHR and Raid 10
100% SHR. RAID10 is not necessary for anyone but very specific enterprise users who need to be able to have crazy up time and performance with spinning disks. You will see no benefit from RAID10 with the 920+
@@SpaceRexWill so what time of rebuild times could I expect if one 8TB drive fails?
Why am i watching this video although I have just 2*4TB Hdd installed? ))) All same for me...shr or raid 1
so in case of my 2 x 4 TB disks, shr and raid1 are similar in size, but raid1 is faster? Or is it the same speed with 2 disks?
Honestly they are going to be the same for 2 disks. Raid1 might be slightly faster
I needed to replace a HD in one of my servers and trusted this video to increase my SHR Volume (5x8TB), and it failed. I installed a 10 TB HD in one slot, trusting the recommendation that Synology would then allow me to expand the volume size by the delta of this one replaced HD in SHR, which is what I have installed on this server, but it did NOT. The DSM didn't give me the option of increasing the volume size. After the "repair" stage, it just let me add the new drive to the existing volume as if it were a 4 TB drive.
That is because you added one single disk. As I said here SHR takes the largest disk for redundancy. Therefore since the 10TB drive was now the largest it was used for redundancy.
If you add another drive it will work
@@SpaceRexWill ah, I see. I completely did not take that away from the video. I'll listen to it again, but I interpreted this very differently. My first setup already HAD that redundancy, so I falsely assumed the rest would be recognized.
In any event, thank you very much for clarifying.
Your videos are very informing, and the example you did in Excel to show the raid differences was very helpful.
I have the DS920+. I have 3 x 14TB disks. I wanted to do the SHR-1 Raid 5 but I was told if the controller hardware fails all the disks will be screwed. Is this true? Does the controller contain any raid information on there which will ruin the whole 3 x 14TB disks? Therefore apart from the 1 disk failure is there any other single point of failures on the DS920+ I should be aware of ? Urgent!!!
whoever told you the controller hardware existed is wrong. There is no hardware controller in a Synology, only software. If the cables fail then the pool offline and you should be fine to restore.
But still have a backup of your critical data
@@SpaceRexWill So if I use RAID 5 instead of RAID 1, apart from being able to lose 1 disk is it totally unstable to use RAID 5. What are the single point of failures apart from losing more than 1 disk? Does any of the RAID information get stored anywhere else apart from the disks? Any other downside to using RAID 5?
Thank you!
thanks
ty man
Does anybody have a way to read an SHR RAID drive with a USB external hard drive enclosure? It shows up in device manager and disk management, but it doesn't come up as a drive in windows explorer. Is there a way to do that?
Synology does have a download that you can use. Not sure if it runs fully on windows
@@SpaceRexWill Is it native to Linux?
if i have 6x2tb wd gold in she, will this still be similar performance to RAID5, using 10gbe
They would hav the same performance
SpaceRex thanks buddy! I swear you answer comments note than any other tech TH-camr around, absolutely love your videos and you make some fairly complex concepts really understandable
Thanks! I’m really glad people find these videos so useful!
Fucking Awesome Willy
"if you want 4TB extra you can buy 2x 8TB drives" in SHR. I think this is wrong!
Small Verbal Typo Correction: RAID = Redundant Array of Independent Disks, not Inexpensive Disks
It actually is both (no one can agree) en.wikipedia.org/wiki/RAID
@@SpaceRexWill afaik - you are correct "Inexpensive", haha I was around when that term came into being..
SO to make clear and short - SHR only usfull if you doing RAID5(6). Have no use on Raid1
Right!
Or just buy all equal disks and go with Raid 5 ; )
So that is what I did and I actually regret not going with SHR1. if you have all equal disks SHR1 is RAID5 under the hood. But with SHR you get to add larger disks later
i prefer 1 on site raid 0 and 1 offsite raid 0,
bcz no matter how many raid or shr u use if thr is power surge or smthing else happn who knows what u r doomed
Totally aggeee with you
So no advantage of your drives are the same and you have no need to expand. If anything data recovery from a SHR can be much more convoluted then a hardware raid1.
In the event of a nas failure and you need to get data from a SHR volume, you appear to need all the disks from the array. Doesn't this mean you don't have redundancy...
www.synology.com/en-global/knowledgebase/DSM/tutorial/Storage/How_can_I_recover_data_from_my_DiskStation_using_a_PC
", you must install all the drives (excluding hot spare drives) in your PC at the same time". My hardware raid1, I didn't need to do any of that, it was just a regular ext4 volume I could copy from **ANY** of the drives in the array.
So that is just explaining to the user to make sure to include all of the drives. If you had three drives in SHR you would have a RAID 5 (basically) meaning you would have to have two of the drives. But instead they explain it as “add all the drives” for simplicity. If you have RAID1 with a 2 drive bay it’s honestly not worth SHR as you can’t expand
Broo bro. 4K is very well. good, but it's making echo??? because you don't have a microphone. that's more important! The sound is more important boss
Very difficult to understand what you are explaining. Using the spreadsheet makes it worse to understand what you are doing to calculate disk space
you tend to make really weird pauses. Plus the morphing transition effect is really off putting. Perhaps just cut the video or use some other effect.
no it's not outputting. it's rather better than just regular cut. If you think pauses is weird, try to record video to a camera yourself without pausing or forgetting what the beginning of your sentence was :D
his face and 1000yard stare is so distracting
Great informational videos, but can you please start talking normal ?
Does SHR affect performance when running with all same size disks vs RAID?
For example, if I have a 2-Bay Synology with two same-size disks, can I pick SHR for future-proofing and not worry about any performance-impacting overhead?
If they are all the same size then SHR has no measurable impact
@@SpaceRexWill Thank you, and thanks for the great informative videos!
Thanks!
Thank you!