On Fri, August 13, 2010 07:52, Edward Ned Harvey wrote:
> If you have ZIL disabled, then sync=async. Up to 30sec of all writes are
> lost. Period.
>
> But there is no corruption or data written out-of-order. The end result
> is as-if you halted the server suddenly, flushed all the buffers to disk,
> and then powered off.
With the proviso that you should ideally be using a version of OpenSolaris
later than snv_128 which allows you to go back a previous uberblock/txg in
case the more recent one(s) are not viable:
"zpool recovery support"
http://arc.opensolaris.org/caselog/PSARC/2009/479/
"need a way to rollback to an uberblock from a previous txg"
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6667683
http://www.c0t0d0s0.org/archives/6067-PSARC-2009479-zpool-recovery-a.html
If you're at ZFSv20 or later, you're pretty much guaranteed to have this
functionality:
http://hub.opensolaris.org/bin/view/Community+Group+zfs/20
I'm hoping this, and slogs removal are incorporated into Solaris-proper soon:
http://hub.opensolaris.org/bin/view/Community+Group+zfs/19
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