Raid-Z Expansion

OpenZFS
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Has there been any further progress on the Raid-Z Expansion feature?

I saw that the pull had been closed, but where are we up to as far as testing and progress into the mainstream?

Is anybody following it?

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I think it was merged.

1 Like
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Thanks, but I wonder what version it becomes available from?

I know it will depend on the different OS builders but for example, the Ubuntu box I’m on now is

  • zfsutils-linux 2.1.5-1ubuntu6~22.04.4
  • zfs mod version 2.2.0-0ubuntu1~23.10.2
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I don’t see #15022 mentioned in any of the release notes on github. Based on the date it was merged, I would think it was included in the 2.2.0 release.

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It looks like Ubuntu users are out of luck still, even with the new LTS 24.04 according to the Man pages.

https://manpages.ubuntu.com/manpages/noble/en/man8/zpool-attach.8.html

Attaches new_device to the existing device. The existing device cannot be part of a raidz configuration. If device is not currently part of a mirrored configuration, device automatically transforms into a two-way mirror of device and new_device. If device is part of a two-way mirror, attaching new_device creates a three-way mirror, and so on. In either case, new_device begins to resilver immediately and any running scrub is cancelled.

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I just upgraded from 2.1.14 to 2.2.4. The man page is different now.
https://manpages.debian.org/unstable/zfsutils-linux/zpool-create.8.en.html

Edit: Just realized I posted the wrong man page.
Looks like in 2.2.4, expanding raidz still isn’t possible.
https://manpages.debian.org/unstable/zfsutils-linux/zpool-attach.8.en.html

But there was a commit for it.

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It is expected to be available in TrueNAS SCALE 24.10

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Looks like RAID-Z Expansion will be available in ZFS 2.3.0

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