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- เผยแพร่เมื่อ 21 มี.ค. 2023
- What is RAID?
A redundant Array of Independent Disks (RAID) is a mechanism that can prevent data loss by combining multiple drives into one logical storage unit. Multiple drives provide redundancy by spreading data across them, which can provide protection against one or more drives failing based on the RAID level used. RAID configuration is easy as the default QNAP NAS settings will recommend an ideal RAID structure for your NAS.
RAID management made flexible
QNAP NAS supports various RAID types that provide varying levels of performance and data redundancy. Based on the number of drives in your NAS, you can choose from single; RAID 0, 1, 5, 6, 10, 50, 60; and hot spare configurations.
QNAP NAS with the QuTS hero operating system also supports Triple Parity to provide protection against three drives failing, while the Triple Mirror provides mirroring protection for three drives.
RAID 50/60 strikes a balance between capacity, protection, and performance for high-capacity NAS with multiple drive configurations. For businesses using a NAS with over 10 drives, RAID 50/60 not only provides greater data protection than a single RAID 5/6 but also maximizes usable storage space compared to RAID 10. Besides data storage, and with the random write performance boost when using SSD RAID, RAID 50/60 also offers a great choice.
Assigning a hot spare gives extra protection against data loss. If a hard drive in a specific RAID group fails, the RAID group will be automatically rebuilt with the hot spare and the remaining healthy drives to ensure continuous system operation. The global hot-spare drives can also be shared across multiple RAID groups.
RAID Scrubbing is used to verify the data integrity of disk groups with RAID 5 and RAID 6 configurations. It works by running a redundancy check to detect and correct inconsistencies that are undetectable during routine usage. QNAP NAS users are recommended to run RAID Scrubbing monthly: periodically running RAID Scrubbing can detect potential corrupted data or drives at an early stage, giving your NAS the chance to attempt automatic repairs or to report drive-related issues, helping to increase the integrity of user data, and to proactively ensure the security of disk groups.
Raid Calculator
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0:06 - Introduction to RAID Setup
2:46 - Setting up RAID 0 on your QNAP NAS
6:30 - Setting up RAID 10 on your QNAP NAS
9:23 - Setting up RAID 5+1 (RAID 5 with hot spare) on your QNAP NAS
12:31 - Setting up RAID 6 on your QNAP NAS
15:10 - Setting up RAID 50 on your QNAP NAS
18:20 - ZFS RAID explanation
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Thanks for this video. Has ZFS moved on yet to allow additional disks to be added at a later date to expand the pool? If not, do you know if it's in the pipeline? This restriction is probably the biggest negative with ZFS versus other file systems.
Sadly not, that is still a limitation with ZFS.
@@QNAPUK I believe OpenZFS have added the ability to extend vdev in release 2.1. My question is which zfs release QuTS hero is based on.
Expanding a RAIDZ vdev by a single disk whilst possible in newer versions of OpenZFS is still not necessarily a good idea as data will not be distributed evenly across drives once new ones are added to the vdev which may impact performance.
@@QNAPUK Is that what they were asking though? ZFS can absolutely have devices added to expand the POOL and has had that for quite some time. Even the QuTS docs say you can do it. The caveat with expanding the pool is that you need to expand by a number of devices appropriate for your chosen configuration. I've been running ZFS here for years (not QNAP, yet) and add/remove mirrors to/from my primary pool all the time. Expanding VDEVs is a different story altogether.
This may be a dumb question but once the raid is built, over time as drives get replaced can I adjust the raid size? i.e. I start with 4x4 TB drives and replace each 1 at a time with 8TB drives, once all drives are 8TB (I understand your limited to the smallest drive in a raid) can I adjust the raid partition size?
Yes absolutely you can, and thats how you would normally migrate from a small to larger drives in a RAID group. Eventually when you've replaced the last drive, you can go to Storage & Snapshots, and Expand the RAID the extra space the 8Tb's have provided. We go in to more detail here on how to do it - th-cam.com/video/dcMof3oCfRE/w-d-xo.html - Thanks 😊
Hello, I have just ordered a QNAP TS-233 and a single 4TB hdd, I want to now if I can start off using one drive and then in a few months add another drive and make it raid1. Will I lose my data on the first disk when changing to raid1. Do I have to start off with 2 disks? or can i change to raid 1 later when I add a disk
Yes, we call it RAID migration, you can go from a single drive to RAID 1 when you add the second drive. You will not lose the data from the first disk when doing this. More info here: www.qnap.com/en/how-to/tutorial/article/online-raid-level-migration
Hi, does RAID 6 allow option for spare disks? How should I proceed when adding new disc to array?
Yes, you would first create your RAID and add the hot spare after. So if you have an 8-bay NAS, you would first create your RAID6 with just 7 disks, once that has been created you can go manage the Storage Pool again and choose the option to add a Hot Spare to it. It's a little different with QTS, you can add the Hot Spare during RAID creation with that.
@@QNAPUKthanks. And it's possible to create RAID 6 with only for example 5 drives and add new ones later? If no, how should I proceed when buying new disc?
Hi, can I understand whether RAID6 in this context is Radiz2 or it is indeed a traditional RAID6?
It is definitely RAIDZ2, we just chose to use a more conventional naming convention, under the hood it is ZFS so will use RAIDZ2.
Hi, I running quts with 4 x 10TB seagate exos x18 drives, I'm running a 10gig network so am I right in assuming raid 10 is best performance under zfs, I know I'll loose half storage capacity... Thanks.
There is only so much performance available from 4 x HDD's, there isn't really a configuration you can do with them that will max out a 10GbE port, even RAID 0 (which i do not recommend) will fall short as each drive can only do about 200MB/s with ideal data.
Can I convert a RAID 6 array to a RAID 5 in the event I need more space?
No sadly
No you cannot downgrade the RAID.