[zfs-discuss] PSARC recover files?

[Tim Cook]

On Tue, Nov 10, 2009 at 2:40 PM, BJ Quinn <bjquinn at seidal.com> wrote:

> Say I end up with a handful of unrecoverable bad blocks that just so happen
> to be referenced by ALL of my snapshots (in some file that's been around
> forever).  Say I don't care about the file or two in which the bad blocks
> exist.  Is there any way to purge those blocks from the pool (and all
> snapshots) without having to restore the whole pool from backup?
>


No.  The whole point of a snapshot is to keep a consistent on-disk state
from a certain point in time.  I'm not entirely sure how you managed to
corrupt blocks that are part of an existing snapshot though, as they'd be
read-only.  The only way that should even be able to happen is if you took a
snapshot after the blocks were already corrupted.  Any new writes would be
allocated from new blocks.

--Tim
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