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Date:      Fri, 08 Aug 2008 22:39:39 +0200
From:      Ivan Voras <ivoras@freebsd.org>
To:        freebsd-fs@freebsd.org
Subject:   Re: Strange (?) hangs with ZFS/rsync.
Message-ID:  <g7iaug$ltg$2@ger.gmane.org>
In-Reply-To: <18880785.post@talk.nabble.com>
References:  <18880785.post@talk.nabble.com>

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Maximillian Dornseif wrote:
> I have a ZFS based backup server which rsyncs from a dozen other machin=
es.
> There is only a single rsync active for any point in time and the syste=
m is
> used for nothing else. It has an amd64 kernel and 4GB RAM. I tried to f=
ollow
> the ZFS tuning guide.
>=20
> For a few weeks the machine works well. Since monday it rsync always ha=
ngs
> when fetching a big logfile from a remote machine.=20
>=20
> The two rsync processes are in state "zfs:&b" and "zfs:lo" and can't be=

> killed.
> The other strange thing is that the system is reporting 3367M (!) wired=

> memory.

These look like well known problems with ZFS (see=20
http://wiki.freebsd.org/ZFSKnownProblems). A new version of the ZFS port =

  is currently under development, if you want to try it, you need a=20
8-CURRENT machine and this patch:
http://lists.freebsd.org/pipermail/freebsd-fs/2008-July/004887.html

People have reported that the new patch resolves hangs such as yours.


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