Strange (?) hangs with ZFS/rsync.

[Ivan Voras]

Maximillian Dornseif wrote:
> I have a ZFS based backup server which rsyncs from a dozen other machines.
> There is only a single rsync active for any point in time and the system is
> used for nothing else. It has an amd64 kernel and 4GB RAM. I tried to follow
> the ZFS tuning guide.
> 
> For a few weeks the machine works well. Since monday it rsync always hangs
> when fetching a big logfile from a remote machine. 
> 
> 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 
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 
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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