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Date:      Mon, 5 Nov 2007 10:21:49 +0900
From:      "Adrian Chadd" <adrian@freebsd.org>
To:        "Thomas Sparrevohn" <Thomas.Sparrevohn@btinternet.com>
Cc:        freebsd-current@freebsd.org, Peter Schuller <peter.schuller@infidyne.com>
Subject:   Re: ZFS Hangs
Message-ID:  <d763ac660711041721k2d428f94o35ee316113110d04@mail.gmail.com>
In-Reply-To: <200711050041.38229.Thomas.Sparrevohn@btinternet.com>
References:  <200711021208.25913.Thomas.Sparrevohn@btinternet.com> <200711041423.54336.Thomas.Sparrevohn@btinternet.com> <472DDEA2.7080804@FreeBSD.org> <200711050041.38229.Thomas.Sparrevohn@btinternet.com>

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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

-- 
Adrian Chadd - adrian@freebsd.org



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