Date: Tue, 3 Jun 2003 10:25:28 +0930 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: Jaye Mathisen <mrcpu@internetcds.com> Cc: freebsd-questions@freebsd.org Subject: Re: Vinum performance Message-ID: <20030603005528.GB6446@wantadilla.lemis.com> In-Reply-To: <20030603004823.GA78992@backmaster.cdsnet.net> References: <3ED72156.1070905@intersonic.se> <20030530101845.GG40976@wantadilla.lemis.com> <20030603004823.GA78992@backmaster.cdsnet.net>
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[-- Attachment #1 --] On Monday, 2 June 2003 at 17:48:23 -0700, Jaye Mathisen wrote: > On Fri, May 30, 2003 at 07:48:45PM +0930, Greg 'groggy' Lehey wrote: >> On Friday, 30 May 2003 at 11:16:06 +0200, Per olof Ljungmark wrote: >>> Using Vinum on 4.7-RELEASE-p10, I wonder what can be done to optimize >>> performance. So far I am not impressed but perhaps I did not configure >>> Vinum optimal, grateful for any hints thanks. >> >> You haven't said what your problem is. It definitely depends on your >> application (which may simply be the way you measure it). >> >> FWIW, the stripe size should be a multiple of the file system block >> size. Yes, the man pages don't necessarily say that, but it's also >> not so important. > > Hmmm, I thought the consensus was to use a weird stripe size to avoid > getting all the inode/superblock stuff on 1 disk. Correct, for some definition of "weird". > I seem to recall somebody saying somethingabout using stripe sizes > like 273k and such... Yes, I once said that. Then it occurred to me that many transfers are complete file system blocks. If you have a stripe size which isn't a multiple of the block size, you'll end up with more transfers split across two devices, which has a negative effect on performance. Greg -- When replying to this message, please copy the original recipients. If you don't, I may ignore the reply or reply to the original recipients. For more information, see http://www.lemis.com/questions.html See complete headers for address and phone numbers [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.0 (FreeBSD) iD8DBQE+2/IAIubykFB6QiMRAs5/AKCZyKi6qFc6EciL9PeacELgan8b4wCfeiR0 WuRnurw8UiYCempJ0EiO7Ag= =QGYq -----END PGP SIGNATURE-----
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