Should I use RAIDZ or RAIDZ2?
RAIDZ is a better choice for performance, RAIDZ2 will offer better more redundancy in the case of drive failures. RAIDZ is similar to RAID 3/5 not RAID 0. RAIDZ2 is similar to RAID 6. In ZFS a 5 drive RAIDZ performs better than a 5 drive RAIDZ2.
Can you add drives to RAIDZ?
2 Answers. You can’t expand an existing raidz vdev, you have to blow it away and create it again with the new drive(s). See the other answer for better details. Side note: Someone actually worked out that it’s technically possibly to add drives to a raidz, but the functionality hasn’t been implemented.
Is RAIDZ expandable?
RAIDZ vdev expansion Finally, ZFS users will be able to expand their storage by adding just one single drive at a time. This feature will make it possible to expand storage as-you-go, which is especially of interest to budget conscious home users 3.
Can you add disks to RAIDZ2?
Expanding storage in ZFS The heart of a ZFS storage system is the zpool —this is the most fundamental level of ZFS storage. A storage vdev can be one of five types—a single disk, mirror, RAIDz1 , RAIDz2 , or RAIDz3 . You can add more vdevs to a zpool , and you can attach more disks to a single or mirror vdev .
What’s the difference between RaidZ and raidz2?
With raidz, you can loose one drive and not loose data. a raidz2 is basically a raid6, not a raid 0+1. Instead of one disk being able to reconstruct any lost disk like in raidz, there are 2 disks that can be used. with raidz2, you can loose 2 drives and not loose data.
What’s the maximum number of disks you can use in raid Z2?
In RAID-Z2, the maximum number of disks is at least four. You can go further and try RAID-Z3, which has a maximum of at least five disks and the ability to survive damage to up to three disks. RAID-Z3 is rarely used due to its size.
Can you add a vdev to an existing RaidZ array?
So: Leave the RAIDZ array as it is, but add another vdev to the pool, preferrably at least a RAIDZ-2 one. You can indeed add vdevs to an existing pool. But yeah, if you have a non redundant vdev (ie a single drive) and it fails, it will bring down your whole pool since data is striped across top level vdevs (and there’s no way to change that).
Is there a hardware controller for RAID-Z?
Note that there is not a single hardware controller that implements RAID-Z. The ZFS file system uses an additional level of checksums to search for data corruption without displaying the appropriate messages. ZFS uses checksums with any level of redundancy, including single disk pools.