Date: Tue, 27 Mar 2001 09:39:36 +0100 From: Brian Somers <brian@Awfulhak.org> To: Greg Lehey <grog@lemis.com> Cc: "Michael C . Wu" <keichii@peorth.iteration.net>, dillon@FreeBSD.ORG, fs@FreeBSD.ORG, hackers@FreeBSD.ORG, brian@Awfulhak.org Subject: Re: Vinum stripe size (was: tuning a VERY heavily (30.0) loaded server) Message-ID: <200103270839.f2R8daw48428@hak.lan.Awfulhak.org> In-Reply-To: Message from Greg Lehey <grog@lemis.com> of "Tue, 27 Mar 2001 17:16:53 %2B0930." <20010327171653.G1161@wantadilla.lemis.com>
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> 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'' ?
> Greg
> --
> Finger grog@lemis.com for PGP public key
> See complete headers for address and phone numbers
--
Brian <brian@Awfulhak.org> <brian@[uk.]FreeBSD.org>
<http://www.Awfulhak.org>; <brian@[uk.]OpenBSD.org>
Don't _EVER_ lose your sense of humour !
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