RAID-Z in a disk-failure.

[Alexander Leidinger]

On Sat, 26 Mar 2011 15:42:57 +0100 Anders Andersson
<pipatron at gmail.com> wrote:

> Evening! I have a question about ZFS in a FreeBSD setting, more
> specifically about RAID-Z. I have never used ZFS so I might have
> misunderstood something,  but imagine this situation:
> 
> You're using ZFS in RAID-Z with 4 disks. One of these gets a
> catastrophic failure. You replace the disk with a new one, but when
> the RAID-Z is rebuilt, the software notices that one sector/block on
> another disk has become corrupted. It notices this because ZFS keeps a
> checksum.
> 
> What happens then? Since the redundancy is temporarily disabled
> because of the failed disk, this sector/block is nowhere to be found.
> My hope is that the system will handle this gracefully, so that only
> the file using this block will be unreadable, but the rest of the data
> is available and can be rebuilt. The worst that could happen is that
> the rebuild is refused and the whole pool is gone.
> 
> Have I missed something in this scenario?

If a corruption can not be corrected, tt's only the file (or
directory-subtree) with this corruption which is unreadable.

Bye,
Alexander.

-- 
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