On Thu, 2008-08-07 at 11:34 -0700, Richard Elling wrote:
> How would you describe the difference between the data recovery
> utility and ZFS's normal data recovery process?
I'm not Anton but I think I see what he's getting at.
Assume you have disks which once contained a pool but all of the
uberblocks have been clobbered. So you don't know where the root of the
block tree is, but all the actual data is there, intact, on the disks.
Given the checksums you could rebuild one or more plausible structure of
the pool from the bottom up.
I'd think that you could construct an offline zpool data recovery tool
where you'd start with N disk images and a large amount of extra working
space, compute checksums of all possible data blocks on the images, scan
the disk images looking for things that might be valid block pointers,
and attempt to stitch together subtrees of the filesystem and recover as
much as you can even if many upper nodes in the block tree have had
holes shot in them by a miscreant device.
- Bill
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
