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Leonid Podolny wrote:
> Hi, list.
> I'm having a weird problem with an MD raid. The configuration is as
> follows: 16 SCSI disks connected in pairs into MD raid-0. /dev/sda and
> /dev/sdb form /dev/md0, etc. The machine is dual xeon running rh9.
> I'm running a stress test on the machine and I get inadequate results.
> iostat shows about 80% utilization on all the "first" disks (sda, sdc,
> sde, etc) and about 20% utilization on all the "second" disks.
>
After reading my own letter, I think that my point is not very clear.
When I run the same test on 16 separate disks (i.e. no RAID) all the
disks work at about 90% and the overall result is significantly (~70%)
better. Thus, it looks like software raid ruins the performance instead
of improving it.
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