Perfect, Mike. You made it dead simple. I had heard a more complex explanation that satisfied me, but now (having heard yours) I can explain it to anyone myself. Thanks!
Alex thank you. Hopefully that goes up as I get more consistent with my production. Had a lot of personal challenges. Hopefully I’m at the tail end of all of that.
OK, so I understand how a parity disk can reconstruct the parity bit of each sector (the first bit), but how does it get the other 32,767 bits in that sector? Does the parity drive store the parity information for every single bit on the array like this? for a 4TB array, that would be calculating the parity for 3.2x10^13 bits all together.
Thanks for this video, Mike. I am just getting my feet wet learning about Unraid. I see you haven't posted videos in a while. Hope you are doing well. Any other places I can see your content or posts?
Yes doing very well thank you. Had a lot of things happen in life, and got busy. I’m going to start these videos back up again in the next one or two months. Sorry about the delay. Feel free to pester me from time to time. I’m glad the video was helpful to you !
You could also add and explain that in unRAID, if parity drive and one of your 4 data drives fail, you lose data only on those 2 drives. Other 3 drives are still fine and you don't lose whole array, because data is not striped like in RAID 5 or 6 configuration. That is one of the main advantages of unRAID.
Glad to see more videos. Do you by any chance do one-on-one remote in consultations? Or Skype help sessions? I've got some weird things going on with my 2 unraid server so I think just need a more experienced eye to look over the settings
Reedith, occasionally I can do this. Please contact me privately. (Go to my main TH-cam page by clicking on "Mike Fury Tech" above, click on "About" and below that you will see an icon to send a private message. Please include an e-mail address for me to contact you.
Your JPG has a file size, usually KB which is Kilobyte, or 1024 bytes, each byte is compossed out of 8 bits. Those are either 0 or 1. Each bit has a unique address, same goes for each drive, that way unraid knows which bits to use together.
Is this standard for Unraid? I was under the assumption that unraid didnt stripe data and redundancy were on file level not sector level. This just sounds like normal Raid Jbod.
abvmoose87 this is normal for UNRAID. This is not RAID stripping. In normal RAID 5, actual files are stripped across volumes. So if you lost your parity disk AND one additional disk, you would lose everything. With UNRAID files are stored in whole on individual disks. In RAID 5 you don’t have a separate parity disk, but parity bits on each disk. In UNRAID you have a parity disk that handles the parity bits for all other disks in the entire array. Each disk does not have parity information. This, if you were to lose a parity disk AND one more disk in UNRAID you would only lose the files on that additional disk. The rest of the array would have your files and remain operational. That is the beauty of UNRAID. You can add an additional parity disk in UNRAID, thus increasing your fault tolerance. You can do the same in RAID with RAID 6. RAID has the advantage of faster performance due to stripping. Excellent for systems that need top performance. (Databases, multiple user access, etc) UNRAID is better from a fault tolerance and simplicity perspective. Perfect for media servers, archive data or SOHO use. There are other non storage advantages to UNRAID, but that goes beyond the scope of this discussion. I hope this helps. - mike
Perfect, Mike. You made it dead simple.
I had heard a more complex explanation that satisfied me,
but now (having heard yours) I can explain it to anyone myself. Thanks!
Thank you for the kind comment. That's exactly the result I was hoping to achieve.
Thank you Mike for the video! You made it much easier to understand than other youtubers! I can't believe you only have 1k subs!
Alex thank you. Hopefully that goes up as I get more consistent with my production.
Had a lot of personal challenges. Hopefully I’m at the tail end of all of that.
Ok that really helped me to understand how parity functions. Thanks for explaining it this way, sector to sector.
Great video brotha, thanks for you time and knowledge!
OK, so I understand how a parity disk can reconstruct the parity bit of each sector (the first bit), but how does it get the other 32,767 bits in that sector? Does the parity drive store the parity information for every single bit on the array like this? for a 4TB array, that would be calculating the parity for 3.2x10^13 bits all together.
Great explanations!!! Thank you
Finally it makes sense
Thanks for this video, Mike. I am just getting my feet wet learning about Unraid. I see you haven't posted videos in a while. Hope you are doing well. Any other places I can see your content or posts?
Yes doing very well thank you.
Had a lot of things happen in life, and got busy. I’m going to start these videos back up again in the next one or two months. Sorry about the delay. Feel free to pester me from time to time.
I’m glad the video was helpful to you !
You could also add and explain that in unRAID, if parity drive and one of your 4 data drives fail, you lose data only on those 2 drives. Other 3 drives are still fine and you don't lose whole array, because data is not striped like in RAID 5 or 6 configuration. That is one of the main advantages of unRAID.
I think I did mention that in the video. (Or perhaps another video). That is one of the best reasons to choose UnRAID. :-) Thanks for mentioning it!
Great video Mike! Thanks for sharing it with us.😎👍JP
Glad to see more videos. Do you by any chance do one-on-one remote in consultations? Or Skype help sessions? I've got some weird things going on with my 2 unraid server so I think just need a more experienced eye to look over the settings
Reedith, occasionally I can do this. Please contact me privately. (Go to my main TH-cam page by clicking on "Mike Fury Tech" above, click on "About" and below that you will see an icon to send a private message. Please include an e-mail address for me to contact you.
If I am not mistaken, can the parity drive can also be larger than the biggest storage drive?
Yes, it can be larger. It needs to be the same size or larger. It cannot be smaller.
Good explanation, thanks
Great video!
When I write a jpg file to the array, how do you get a 1 or a 0 for your sector parity calculation?
Your JPG has a file size, usually KB which is Kilobyte, or 1024 bytes, each byte is compossed out of 8 bits. Those are either 0 or 1. Each bit has a unique address, same goes for each drive, that way unraid knows which bits to use together.
Can you use an 8tb parity drive and 4 Tb drives x 5 in an array?
Dan Dee yes. Absolutely
Is this standard for Unraid? I was under the assumption that unraid didnt stripe data and redundancy were on file level not sector level. This just sounds like normal Raid Jbod.
abvmoose87 this is normal for UNRAID. This is not RAID stripping.
In normal RAID 5, actual files are stripped across volumes. So if you lost your parity disk AND one additional disk, you would lose everything.
With UNRAID files are stored in whole on individual disks. In RAID 5 you don’t have a separate parity disk, but parity bits on each disk. In UNRAID you have a parity disk that handles the parity bits for all other disks in the entire array. Each disk does not have parity information.
This, if you were to lose a parity disk AND one more disk in UNRAID you would only lose the files on that additional disk. The rest of the array would have your files and remain operational. That is the beauty of UNRAID.
You can add an additional parity disk in UNRAID, thus increasing your fault tolerance. You can do the same in RAID with RAID 6.
RAID has the advantage of faster performance due to stripping. Excellent for systems that need top performance. (Databases, multiple user access, etc)
UNRAID is better from a fault tolerance and simplicity perspective. Perfect for media servers, archive data or SOHO use. There are other non storage advantages to UNRAID, but that goes beyond the scope of this discussion.
I hope this helps.
- mike
@@MikeFuryTech Thanks for the great explanation