Date: Wed, 9 Sep 2015 11:15:30 -0453.75 From: "William A. Mahaffey III" <wam@hiwaay.net> To: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: Storage question Message-ID: <55F059D8.5000101@hiwaay.net> In-Reply-To: <C48993B7-EF03-4EBE-B949-601509711EF3@kraus-haus.org> References: <55EF3D23.5060009@hiwaay.net> <20150908220639.20412cbd@gumby.homeunix.com> <55EF5409.8020007@yahoo.com> <55EFC2DA.3020101@hiwaay.net> <08B351DD-AA48-4F30-B0D6-C500D0877FB3@lafn.org> <55F02DC8.7000706@hiwaay.net> <20150909150626.5c3b99e5.freebsd@edvax.de> <55F031A0.40500@hiwaay.net> <20150909145820.c3b48aafad4f70553c1c1fd8@sohara.org> <55F0451A.5080709@hiwaay.net> <20150909160005.d3b84775c3d0748014a871e5@sohara.org> <55F04D78.8070508@hiwaay.net> <C48993B7-EF03-4EBE-B949-601509711EF3@kraus-haus.org>
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On 09/09/15 10:51, Paul Kraus wrote:
> Swap on zvol is a bad idea (as you may have already found). The issue, as best I can tell, is that since ZFS grabs all the RAM it can, and SWAP is used in low RAM situations, there are times were SWAP is trying to write to the zvol and ZFS is trying to decrease it’s RAM usage (because of memory pressure) so it’s performance drops. Functionally it becomes a race state that ends badly.
Yeah, I figured that out *right* after I hit the 'return' key ;-) ....
--
William A. Mahaffey III
----------------------------------------------------------------------
"The M1 Garand is without doubt the finest implement of war
ever devised by man."
-- Gen. George S. Patton Jr.
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