ZFS & Bittorent -> Hang?

Ivan Voras ivoras at freebsd.org
Thu Apr 3 11:43:36 UTC 2008


jbsnyder wrote:
> Hi -
> 
> I'm not yet filing a PR on this since I'm wondering if anyone else has
> experienced this issue.  I've got ZFS running on a raid-z with 4 disks,
> C2Duo 2.33 Ghz, 64-bit FreeBSD 7 release, 4GB RAM.  For the most part this
> has been working perfectly, but I recently I tried using transmission-daemon
> (a bittorrent client/daemon) to download a few things and noticed that if it
> runs for an extended period of time, a lot of processes are waiting on zfs
> and just hang.  If I'm not logged in while this is happens, SSH access
> hangs.  Also, if I manage to be logged in, AFP access to the volume, and
> some heavier disk access items (like building from ports at stages of
> unzipping archives and checksumming) seem to hang as well.
> 
> I've not done extensive testing, but the same behavior has been exhibited
> both times I've tried it.  The interesting thing is that the transmission
> seems to keep on chugging, and does finish downloading eventually, it's just
> that everything else doesn't get a chance at getting some IO, even if I kill
> the transmission-daemon.
> 
> I've done the recommended tweaks on the freebsd wiki for AMD64 machines, and
> I'm running ULE.  Otherwise things are pretty standard.
> 
> I'll file a more detailed PR with some additional testing if nobody else has
> encountered this and/or has a workaround.

http://wiki.freebsd.org/ZFSKnownProblems

This looks like #1.

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