Date: Wed, 09 Feb 2005 10:37:12 -0800 From: "Mark A. Garcia" <mag@hamletinc.com> To: "Marc G. Fournier" <scrappy@hub.org> Cc: freebsd-questions@freebsd.org Subject: Re: vinum in 4.x poor performer? Message-ID: <420A5858.6020602@hamletinc.com> In-Reply-To: <20050209001254.G94338@ganymede.hub.org> References: <20050208231208.B94338@ganymede.hub.org> <20050208234602.M94338@ganymede.hub.org> <20050209001254.G94338@ganymede.hub.org>
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Marc G. Fournier wrote: > > Self-followup .. the server config is as follows ... did I do maybe > mis-configure the array? > > # Vinum configuration of neptune.hub.org, saved at Wed Feb 9 00:13:52 > 2005 > drive d0 device /dev/da1s1a > drive d1 device /dev/da2s1a > drive d2 device /dev/da3s1a > drive d3 device /dev/da4s1a > volume vm > plex name vm.p0 org raid5 1024s vol vm sd name vm.p0.s0 drive d0 plex > vm.p0 len 142314496s driveoffset 265s plexoffset 0s > sd name vm.p0.s1 drive d1 plex vm.p0 len 142314496s driveoffset 265s > plexoffset 1024s > sd name vm.p0.s2 drive d2 plex vm.p0 len 142314496s driveoffset 265s > plexoffset 2048s > sd name vm.p0.s3 drive d3 plex vm.p0 len 142314496s driveoffset 265s > plexoffset 3072s > > bassed on an initial config file that looks like: > > neptune# cat /root/raid5 > drive d0 device /dev/da1s1a > drive d1 device /dev/da2s1a > drive d2 device /dev/da3s1a > drive d3 device /dev/da4s1a > volume vm > plex org raid5 512k > sd length 0 drive d0 > sd length 0 drive d1 > sd length 0 drive d2 > sd length 0 drive d3 > It's worth pointing out that your performance on the raid-5 can change for the better if you avoid having the stripe size be a power of 2. This is especially true if the (n)umber of disks are a 2^n. Cheers, -.mag
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