PE4600 and Red Hat Questions

Abe Hayhurst abe at
Fri Jun 21 18:51:00 CDT 2002

How many MB/sec did you get with 128KB vs. 256KB vs. 512KB for sequential
read/write vs. random read/write?

>-----Original Message-----
>From: Seth Mos [mailto:knuffie at]
>Sent: Friday, June 21, 2002 4:21 PM
>To: Arjan van de Ven; Abe Hayhurst
>Cc: linux-poweredge at
>Subject: Re: PE4600 and Red Hat Questions
>At 16:35 21-6-2002 -0400, Arjan van de Ven wrote:
>>for raid0/1 I'd recommend 64K to 128Kb... smaller is worse generally.
>>Playing with the caching settings (and readahead) is worth it, the optimal
>>settings for these very much depends on the workload
>128KB works well in combo with both the 10KRPM and 15KRPM disks.
>I tested this on a PERC3/DC in a 2550 with raid10. Larger gives you better
>sequential throughput.

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