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From: Thomas Sparrevohn <Thomas.Sparrevohn@btinternet.com>
To: "Adrian Chadd" <adrian@freebsd.org>
Date: Mon, 5 Nov 2007 11:14:20 +0000
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Cc: freebsd-current@freebsd.org, Peter Schuller <peter.schuller@infidyne.com>
Subject: Re: ZFS Hangs
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On Monday 05 November 2007 01:21:49 Adrian Chadd wrote:
> On 05/11/2007, Thomas Sparrevohn <Thomas.Sparrevohn@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
> 

Hmm - What do you mean - A traditional BSD partition or a ZFS volume?