Date: Fri, 30 May 2003 11:57:33 -0700 From: "Drew Tomlinson" <drew@mykitchentable.net> To: <peo@intersonic.se>, "Chuck Swiger" <cswiger@mac.com> Cc: freebsd-questions@freebsd.org Subject: Re: Vinum performance Message-ID: <050a01c326dd$54802ce0$6e2a6ba5@tagalong> References: <3ED72156.1070905@intersonic.se><20030530101845.GG40976@wantadilla.lemis.com> <3ED74FF4.2010905@intersonic.se><3ED77728.8080009@mac.com> <3ED77BB3.4080900@intersonic.se>
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----- Original Message ----- From: "Per olof Ljungmark" <peo@intersonic.se> To: "Chuck Swiger" <cswiger@mac.com> Cc: <freebsd-questions@freebsd.org> Sent: Friday, May 30, 2003 8:41 AM > > What ratio of reads to writes do you expect? > > Had no expectations really, I'm new to Vinum. > > >> Copying 170 files total 319MB TO the Vinum volume takes about 2m45s. > >> Copying same files FROM the Vinum volume to another volume on a > >> hardware raid5 controller takes 43s. > > > > > > A 3-1 ratio in speeds for software RAID-5 versus hardware doesn't strike > > me as being very wrong.... > > > >> This machine is not in production yet so I can still make changes to > >> the configuration. The current block size is 16384 and the stripe size > >> 419k. I assume it would be a good idea to change that to for example > >> 491,520? > > > > > > ...or try a few stripe sizes, such as 64K or 128K. FWIW - The man page suggests avoiding powers of 2 and a minimum 128K strip size. Cheers, Drew > Thanks for your comments, I felt it was a good idea just to check before > we start to use this piece seriously then I will not be able to touch it > for changing configuration. Will try different stripe sizes as per your > advice. > > /per olof > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" > >
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