vinum in 4.x poor performer?
Mark A. Garcia
mag at hamletinc.com
Wed Feb 9 10:38:49 PST 2005
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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