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David,

Have you reviewed the iSeries Disk Arm Requirements document available at
the following URL?

http://www-1.ibm.com/servers/eserver/iseries/perfmgmt/diskarm.htm

If these are the published guidelines you are referring to, then it would
not be much help.  But they have gone to the trouble of benchmarking their
various controllers and adjusting their disk arm recommendations based upon
specific hardware.

Sorry, no direct experience with your configuration.

Regards,
Andy Nolen-Parkhouse


> On Behalf Of David Morris
> Subject: I/O guidelines
> 
> Does anyone have any supportable guidelines related to the new 2757
> controllers and 4326 drives? IBM's published guidelines seem overly
> conservative and the business partner we purchased our 825 from seems
> overly optimistic. They differ by a factor of 4. We are trying to narrow
> in on a reasonable upgrade to our 20 drives that are becoming a
> bottleneck. I can come up with a number that works but it would be
> really helpful if we had another opinion that wasn't as skewed.
> 
> Thanks,
> 
> David Morris




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