Trouble with snapshots
crahman at gmail.com
Wed Apr 2 00:31:10 PDT 2008
> > This is happening on a system set up with journaled ufs filesystems,
> > so that may be part of the problem. The system is running amd64
> > with an Intel Q6600.
> I thought gjournal and soft updates were supposed to be mutually
> exclusive (the latter is required for UFS snapshots). Anyway, even if
> they are supposed to work together this interaction is almost certainly
> the cause.
I actually think that snapshots are a part of UFS2 and that they work
just fine with or without soft updates.
I was wondering if the problems I've seen are limited strictly to
gjournal-based UFS2 systems. I'm guessing that they are, based upon
the fact that the problems are dramatic enough to have shown up in
discussion if they were widespread. But I also wondered if perhaps
the additional concurrency associated with multiple processors might
be a factor.
As it is, it may be prudent for someone intending to use dump with
snapshots to hold off on building filesystems with gjournal until this
Other than this problem, the gjournal/ufs integration has worked
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