Date: Wed, 28 Mar 2001 09:50:34 +0930 From: Greg Lehey <grog@lemis.com> To: Brian Somers <brian@Awfulhak.org> Cc: "Michael C . Wu" <keichii@peorth.iteration.net>, dillon@FreeBSD.ORG, fs@FreeBSD.ORG, hackers@FreeBSD.ORG Subject: Re: Vinum stripe size (was: tuning a VERY heavily (30.0) loaded server) Message-ID: <20010328095034.M1161@wantadilla.lemis.com> In-Reply-To: <200103270839.f2R8daw48428@hak.lan.Awfulhak.org>; from brian@Awfulhak.org on Tue, Mar 27, 2001 at 09:39:36AM %2B0100 References: <grog@lemis.com> <200103270839.f2R8daw48428@hak.lan.Awfulhak.org>
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On Tuesday, 27 March 2001 at 9:39:36 +0100, Brian Somers wrote: >> On Tuesday, 20 March 2001 at 11:11:44 -0600, Michael C . Wu wrote: >>> [Lengthy email, bear with me please, it is quite interesting. >>> This box averages 30.0 load with no problems.] >>> >>> <snip> >>> >>> Average file size is about 4K. /home/bbsusers* is on a vinum >>> stripe'd volume with 3 Ultra160 9G 10000RPM drives on sym0 at stripe >>> size 256K, Greg: I know this should be a prime number, >> >> No, there's no requirement for it to be a prime number. The only >> problem is that with 32 MB cylinder groups and a power of two stripe >> size and subdisk count, you end up with all the superblocks on one >> subdisk, which is a performance issue. Choose the stripe size so that >> the superblocks are roughly evenly distributed. > > A performance issue ? Surely you've misspelt ``reliability'' ? I don't see a reliability issue here. Greg -- Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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