Date: Wed, 02 Aug 2006 23:32:30 -0500 From: Eric Anderson <anderson@centtech.com> To: Kevin Taber <kevin.taber@gmail.com> Cc: freebsd-performance@freebsd.org Subject: Re: RAID 5 stripe size and newfs args Message-ID: <44D17C5E.3020401@centtech.com> In-Reply-To: <ef1ccf060608022059l3e2deae0pd2a541601137fa7e@mail.gmail.com> References: <ef1ccf060608022059l3e2deae0pd2a541601137fa7e@mail.gmail.com>
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On 08/02/06 22:59, Kevin Taber wrote: > Hardware: HP DL380 G4, 3.2Ghz Xeon EM64T, Smart Array 6i, 3GB RAM, 2 logical > drives: 2 x 36GB Ultra320 15k and 4 x 146GB Ultra320 10k > RAID setup in question: 4 x 146GB Ultra320 drives ( roughly 300GB raid 5 ) > > > I'm setting this array up for samba use... Windows 2003 folders will > redirect to a share. I'm going with a raid stripe size of 128KB, what > should my newfs args be? I have heard mixed answers via IRC. I think if I recall correctly you'll want to make sure your filesystem starts on one of the stripe offsets, so either at 0 bytes, or 128k byte offset. If I recall, either phk@ or scottl@ knew the right magic for that. Maybe this paper is related: http://db.usenix.org/events/fast02/schindler/schindler_html/index.html The best way to know for sure, is to test it with your type of workload (simulated or real). Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology Anything that works is better than anything that doesn't. ------------------------------------------------------------------------
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