Date: Fri, 17 Feb 2012 10:24:42 +0000 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: freebsd-fs@freebsd.org Subject: Re: ZFS Snapshot problems Message-ID: <4F3E2AEA.7080401@infracaninophile.co.uk> In-Reply-To: <4F3A7264.8080301@infracaninophile.co.uk> References: <4F377457.4080807@FreeBSD.org> <20120212084052.GA43095@icarus.home.lan> <4F3789C1.9000903@FreeBSD.org> <4F37A8E7.7060102@brockmann-consult.de> <4F37B25A.10002@FreeBSD.org> <4F37BA49.50700@brockmann-consult.de> <4F37C52A.2030803@infracaninophile.co.uk> <4F3A30A2.9050603@FreeBSD.org> <4F3A6D44.4040105@brockmann-consult.de> <4F3A7264.8080301@infracaninophile.co.uk>
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On 14/02/2012 14:40, Matthew Seaman wrote:
> Hmmm... no. That sounds like a thing to try when I have a day or so
> that I can take the machine down for. Probably right around the point
> that I do the upgrade to 9.x. Thinking about it, I'd probably split the
> mirror, rebuild one of the drives, pull the ZFSes across, boot from the
> rebuilt drive and then add the old drive back to the mirror.
Ah. I've worked out what the problem is. dedup. Turning dedup off has
made everything behave normally.
I only turned on dedup as an experiment in the first place, so no great
loss. However, it seems that the bad effects due to dedup only appeared
by chance -- the machine was running fine for months until a change in
operation triggered the problem. That was what should have been a
completely innocuous change from using anoncvs to mirroring /home/ncvs
using csup(1) for the ports tree.
Cheers,
Matthew
--
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
JID: matthew@infracaninophile.co.uk Kent, CT11 9PW
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