Comment by cesarb

Comment by cesarb 5 days ago

> Btrfs [...] still doesn't match ZFS in features [...]

Isn't the feature in question (array expansion) precisely one which btrfs already had for a long time? Does ZFS have the opposite feature (shrinking the array), which AFAIK btrfs also already had for a long time?

(And there's one feature which is important to many, "being in the upstream Linux kernel", that ZFS most likely will never have.)

wkat4242 5 days ago

ZFS also had expansion for a long time but it was offline expansion. I don't know if btrfs has also had online for a long time?

And shrinking no, that is a big missing feature in ZFS IMO. Understandable considering its heritage (large scale datacenters) but nevertheless an issue for home use.

But raidz is rock-solid. Btrfs' raid is not.

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unsnap_biceps 5 days ago

Raidz wasn't able to be expanded in place before this. You were able to add to a pool that included a raidz vdev, but that raidz vdev was immutable.

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- wkat4242 5 days ago
  
  Oh ok, I've never done this, but I thought it was already there. Maybe this was the original ZFS from Sun? But maybe I just remember it incorrectly, sorry.
  I've used it on multi-drive arrays but I never had the need for expansion.
  
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  ryao 5 days ago
  
  You could add top level raidz vdevs or replace the members of a raid-z vdev with larger disks to increase storage space back then. You still have those options now.
  
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