Date: Tue, 2 Jan 2007 00:01:51 -0500 From: Gary Palmer <gpalmer@freebsd.org> To: Ivan Voras <ivoras@fer.hr> Cc: freebsd-geom@freebsd.org Subject: Re: Recommended gmirror solution with swap? Message-ID: <20070102050151.GA90174@in-addr.com> In-Reply-To: <enbim8$d91$1@sea.gmane.org> References: <975053160612310913t3dadcc02yfac58f6fbf0a49df@mail.gmail.com> <enbim8$d91$1@sea.gmane.org>
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On Mon, Jan 01, 2007 at 07:07:59PM +0100, Ivan Voras wrote: > Michael Knoll wrote: > > I am planning on converting my FreeBSD machine to use gmirror on two > > 40gig drives. Reading the handbook and other sites with instructions > > on configuring gmirror, I notice they all disable swap. Is this > > acceptable? Is it expected swap be on another drive? If so, is there > > a solution which I can keep the swap on the mirror. as I don't have > > another drive? > > There's no technical problem with it, it's more a matter of organization > and convenience. For example: you don't really need the swap to survive > a crash, so there's no need to introduce the overhead of mirroring it - > better to leave 2x the space configured as swap area. If you have more > than one area, the system should take advantage of it and use both to > maximize speed (in theory this should work as an implicit RAID0 across > the swap areas). Except in the case where a drive holding some swapped out memory goes bad and the system panics or crashes as a result. It might not make as much sense for desktops, but if I were (still) building servers I'd mirror everything that the system depended on to run.
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