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SubjectRe: Dumb question: Which is "better" SCSI or IDE disks?
On Mon, 14 Dec 1998, C S Hendrix wrote:

> A couple of minutes ago I got 5.25 MB/sec for the same drive.
>
> The RAID devices I have get just about identical values from hdparm.
> [...]
> I personally think this system should be faster than that. It is
> a DPT 2044W, dual PPro running Linux 2.1.124, Dario's DPT driver
> with all the performance goodies checked, and dual Seagate Hawk
> fast-wide SCSI drives. I know those drives aren't the fastest
> around, but they aren't terrible either.

The DPT is not the problem (I use them myself). See my other
messages on linux-kernel regarding RAID, Seagates and chunk
sizes. The caching strategy used by Seagate drives appears to
go to pieces when you read, skip, read, skip in anything other
than 32k chunks. The default RAID chunk size used by md is
not 32k...

Mike

--
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On my desk I have a work station...
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| Mike Jagdis | Internet: mailto:mike@roan.co.uk |
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