Expansion does not change the number of failures that can be tolerated without data loss (e.g. a RAID-Z2 is still a RAID-Z2 even after expansion). Beta Was this translation helpful?

January 14, 2025 - After the expansion completes, old blocks remain with their old data-to- parity ratio (e.g. 5-wide RAIDZ2, has 3 data to 2 parity), but distrib‐ uted among the larger set of disks. New blocks will be written with the new data-to-parity ratio (e.g. ...

After the expansion completes, old blocks remain with their old data-to-parity ratio (e.g. 5-wide RAIDZ2, has 3 data to 2 parity), but distributed among the larger set of disks. New blocks will be written with the new data-to-parity ratio (e.g. a 5-wide RAIDZ2 which has been expanded once to ...

November 3, 2023 - Are we able to expand our zfs raidz2 array? Or not. ... Not yet. Maybe we should ask unraid developers when they will implement this?🤔 ... I'm not talking about in unraid, I mean in general. If this is a thing, I'll be moving back to Ubuntu server. more replies More replies More replies More replies More replies More replies ... Then I don't see how this replaces unraid... ... Because one disk expansion is now possible and wasn't before.

July 25, 2025 - The data that exists on the disks prior to the RAIDZ expansion does not automatically restripe from 3x data + 2x parity to 5x data + 2x parity, so it can’t take advantage of the improved storage efficiency of the 7-disk array. The net effect is that you can’t use all of the capacity on your RAIDZ2 pool. You can work ...

February 9, 2022 - The name of the existing raidz vdev is “raidz2-0” and “/var/tmp/6” is the name of the new disk. That looks a little different than disk names in production. The point here is to show placement in the command line for the actual name of the disk. Expect it to take a while as it has to move the data around on the disks. This line will report the progress it is making for you: “raidz expand: Expansion of vdev 0 in progress since Wed Jun 9 16:36:19 2021

Expansion does not change the number of failures that can be tolerated without data loss (e.g. a RAIDZ2 is still a RAIDZ2 even after expansion). A RAIDZ vdev can be expanded multiple times.

June 15, 2021 - With the new code, you'll be able to attach new disks to an existing RAIDz vdev as well. Doing so expands the vdev in width but does not change the vdev type, so you can turn a six-disk RAIDz2 vdev into a seven-disk RAIDz2 vdev, but you can't ...

June 3, 2025 - 2. Maintain Redundancy Levels: Follow identical redundancy levels in all vdevs by maintaining consistent RAID configurations, such as RAIDZ2 or RAIDZ3, across the pool.

March 13, 2024 - If the existing device is a RAID-Z ... of that RAID-Z group. A "raidz expansion" will be initiated, and once the expansion completes, the new device will contribute additional space to the RAID-Z group....

raidz2 4.50G 4.29G 215M - - 60% 95.3% New! Solution · + zpool wait test -t raidz_expand · + zpool status test · pool: test · state: ONLINE · raidz expand: Expansion of vdev 0 copied 4.27G in 0h3m, completed on Wed Jun 9 16:39:31 2021 · config: NAME STATE READ WRITE CKSUM ·

August 4, 2022 - I'm guessing less than 14, meaning that a simple zfs-send(8) is not an option. I don't believe that RAID-Z Expansion is currently available in FreeBSD 13.1-RELEASE, and I think I would have noticed an announcement, However, the article published by the FreeBSD Foundation says Q3 2022, so any time now.

July 25, 2023 - Wait, so if I have an existing single vdev with 8 drives in RAIDZ2 I'd have to wipe that array and re-create it in order to add drives in the future? I didn't get that from the link. ... No, I'm saying you can't turn a RAIDZ1 into a RAIDZ2.

October 24, 2024 - Hi, I know that I can’t add another disk of parity to a RAIDZ. I’d like to understand if this is just something that hasn’t been implemented yet (like RAIDZ Expansion was) or if this is actually not possible and if so,…

You have a RAID-Z pool with 4 disks in it · You want to add a 5th disk