Date: Fri, 30 May 2003 14:35:00 +0200 From: "Per olof Ljungmark" <peo@intersonic.se> To: Greg 'groggy' Lehey <grog@FreeBSD.org> Cc: freebsd-questions@freebsd.org Subject: Re: Vinum performance Message-ID: <3ED74FF4.2010905@intersonic.se> In-Reply-To: <20030530101845.GG40976@wantadilla.lemis.com> References: <3ED72156.1070905@intersonic.se> <20030530101845.GG40976@wantadilla.lemis.com>
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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. Sorry for the minimal info given in initial post - The bottleneck is write performance, reading from the documentation this is normally a weak point in Vinum/raid5 setups. The volume will be used for storing temporary files with sizes in the 1-4MB range, a few hundreds at a time. Reads are fine but writes a bit slow. 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. 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? If you could please confirm if I could look for further improvements or if the performance is about what one should expect. Many thanks, Per olof
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