ZFS Hangs

Adrian Chadd adrian at freebsd.org
Sun Nov 4 17:22:17 PST 2007

On 05/11/2007, Thomas Sparrevohn <Thomas.Sparrevohn at btinternet.com> wrote:

> Oh my god - Overlooked that ;-) - funny that -  Its a bit tricky as it not possibly to dump a kernel
> when the swap is on ZFS - I did a test with all debugging enabled and the problem
> did not show up - which makes it somewhat nasty - I check if I can reproduce it
> with only DDB enabled
> But as I said - I have been running with root on ZFS for quite a while without problems -
> There are however two things that does not make much sense
> 1) number of vnodes are reduces to 100,000  by the kernel (AMD64)
> 2) If I extent the cache size "wildly" it seems to be stable about 600MB +- 67MB

You can dump to a non-ZFS swap partition thats not being used for
swap. Just set it as your dumpdev but don't put it in /etc/fstab.


Adrian Chadd - adrian at freebsd.org

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