Date: Wed, 24 Mar 2010 23:30:20 +0100 From: Miroslav Lachman <000.fbsd@quip.cz> To: Michal <michal@ionic.co.uk> Cc: freebsd-stable@freebsd.org Subject: Re: Multi node storage, ZFS Message-ID: <4BAA927C.802@quip.cz> In-Reply-To: <4BAA4DB6.80604@ionic.co.uk> References: <4BAA3409.6080406@ionic.co.uk> <b269bc571003240920r3c06a67ci1057921899c36637@mail.gmail.com> <C901C61A8023D94FD0DFBF27@192.168.1.44> <b269bc571003241014u3a97bf81v8e21742440bef8af@mail.gmail.com> <4BAA4DB6.80604@ionic.co.uk>
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Michal wrote: > On 24/03/2010 17:14, Freddie Cash wrote: > >> >> Yes, that would be helpful (mirrored slogs, until we get slog removal >> support). >> >> As would an L2ARC (cache) device in the head node. >> >> As well as lots and lots and lots of RAM. >> >> And as fast of ethernet NICs as you can get between the head node and the >> storage nodes. >> >> And, and, and, and ... :) >> > > As far as I know more RAM is more important the fast CPU, so RAM is the > order of the day, and I guess it depends what you think fast CPU is, but > I wasn't planning on a duel CPU or anything top of the range. I have > some duel core's knocking around... Any modern multicore CPU will be fine. And more RAM you have, the larger ARC / prefetch will be used (more read speed you will gain) > Michael, I sort of understand what you are talking about with ZIL, but > not completely, so thanks for the pointers, there are clearly things I > have not thought about. This links can be useful to you ZFS L2ARC http://blogs.sun.com/brendan/entry/test ZFS Evil Tuning Guide http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide#Disabling_the_ZIL_.28Don.27t.29 ZFS ZIL + L2ARC SSD Setup http://www.mail-archive.com/zfs-discuss@opensolaris.org/msg34674.html Miroslav Lachman
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