On Jul 25, 2009, at 12:24, roland wrote:
why can i loose a whole 10TB pool including all the snapshots with
the logging/transactional nature of zfs?
Because ZFS does not (yet) have an (easy) way to go back a previous
state. That's what this bug is about:
need a way to rollback to an uberblock from a previous txg
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6667683
While in most cases ZFS will cleanly recover after a non-clean
shutdown, there are situations where the disks doing strange things
(like lying) have caused the ZFS data structures to become wonky. The
'broken' data structure will cause all branches underneath it to be
lost--and if it's near the top of the tree, it could mean a good
portion of the pool is inaccessible.
Fixing the above bug should hopefully allow users / sysadmins to tell
ZFS to go 'back in time' and look up previous versions of the data
structures.
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