Date: Sun, 12 Feb 2012 14:48:11 +0000 From: Luke Marsden <luke-lists@hybrid-logic.co.uk> To: Peter =?ISO-8859-1?Q?Ankerst=E5l?= <peter@pean.org> Cc: stable@freebsd.org Subject: Re: Swap on zvol - recommendable? Message-ID: <1329058091.2541.104.camel@pow> In-Reply-To: <A8CE0B38-C313-4B14-BEEC-ED16366D0A5B@pean.org> References: <99FFD8AE-F4E0-4BD9-92BC-45D8C8A31383@punkt.de> <A8CE0B38-C313-4B14-BEEC-ED16366D0A5B@pean.org>
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> On Feb 6, 2012, at 11:57 AM, Patrick M. Hausen wrote: >=20 > > Hi, all, > >=20 > > is it possible to make a definite statement about swap on zvols? > >=20 > > I found some older discussions about a resource starvation > > scenario when ZFS arc would be the cause of the system > > running out of memory, trying to swap, yet the ZFS would > > not be accessible until some memory was freed - leading to > > a deadlock. > >=20 > > Is this still the case with RELENG_8? The various Root on > > ZFS guides mention both choices (decicated or gmirror > > partition vs. zvol), yet don't say anything about the respective > > merits or risks. I am aware of the fact that I cannot dump to > > a raidz2 zvol ... > >=20 On Tue, 2012-02-07 at 20:53 +0100, Peter Ankerst=C3=A5l wrote: > I can just tell you I had this problem still in 8.1 and it was a HUGE > problem. System stalled every two weeks or so. Now when the swap is > moved away from zfs it works fine. >=20 I can confirm that this is still a problem on 8.2 and 9.0. --=20 CTO, Hybrid Logic +447791750420 | +1-415-449-1165 | www.hybrid-cluster.com=20
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