Replacing dead drives in ZRAID2

Rich rercola at pha.jhu.edu
Wed May 2 21:18:23 UTC 2012


It's perfectly possible to do a 3-way RAID-Z2 - just not useful, AFAIK.

Also, Simon, I think the disconnect between you and the mailing list
is that you are observing bad behavior of the system when you remove
the drives, and you think this is a ZFS problem. This is not a ZFS
problem - if the underlying storage driver (ahd) freezes up and stops
handling requests (which is what it sounds like you're describing
here), there's not much ZFS can do about it.

- Rich

On Wed, May 2, 2012 at 5:05 PM, Mark Felder <feld at feld.me> wrote:
> First of all, you're testing on decade old SCSI hardware that probably
> hasn't seen any serious use on a newer FreeBSD install in a very, very long
> time.
>
> Secondly, I'm confused about the concept of a "3 drive RAIDZ2". How is that
> even possible? Two drives have to be parity, so the last drive is... the
> entire dataset? Why aren't you just doing a 3-way mirror?
>
> And finally yes, you can just yank drives in a ZFS array to simulate a
> failure. After reinsertion you have to manually add them back to the pool,
> but it certainly works.
>
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