Date: Tue, 22 Jul 2014 20:02:12 +0200 From: Ralf Mardorf <ralf.mardorf@rocketmail.com> To: freebsd-questions@freebsd.org Subject: Re: [Bulk] Re: How much swap space for a 32 GB RAM system? Message-ID: <1406052132.7452.7.camel@rocketmail.com> In-Reply-To: <lqm7dg$vau$1@ger.gmane.org> References: <53CE8BB8.7030303@qeng-ho.org> <53CE8F62.8090701@tysdomain.com> <lqm7dg$vau$1@ger.gmane.org>
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On Tue, 2014-07-22 at 13:35 -0400, Michael Powell wrote: > Since I don't use such things (me sysadmin - not a coder) I'm not as > knowledgeable, but I seem to recall that a crash dump needs a swap > that is as large as physical memory. "My 48GB swap file system isn't fully recognized. Q. What is the max amount of swap a system can use? A. Are you sure you want/need that much swap anyway? The old-school 2-4x RAM doesn't really apply, though you may want a bit more than 1x physical RAM if you are capturing a crash dump, and some systems have >32GB RAM now. Swap can be limited by kern.maxswzone which controls the size of metadata use to track swap (8.X default is 64MB allowing ~15GB of swap). Note other changes are required to have >8x physical RAM for swap." - https://commons.lbl.gov/display/~jwelcher@lbl.gov/FreeBSD +Random+FAQ Interesting thread, since there isn't an answer for Linux and I plan to use a new FreeBSD install in the close future too.
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