PE4600 and Red Hat Questions

Abe Hayhurst abe at wedographics.com
Fri Jun 21 16:53:00 CDT 2002


Is the stripe size the size of the chunk of data that is put on an
individual hard drive?

What size chunks does Linux expect to get? Wouldn't it expect to get
standard SCSI 64kb chunks?

If 128kb is good, is 256 kb better? How high can you go?

>-----Original Message-----
>From: Seth Mos [mailto:knuffie at xs4all.nl]
>Sent: Friday, June 21, 2002 4:21 PM
>To: Arjan van de Ven; Abe Hayhurst
>Cc: linux-poweredge at dell.com
>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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