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04.06.2007 at 02:34AM PDT, ID: 22496076
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7.6

Dell 6800 PERC4 adapter: read/write cache

Asked by Jan_Franek in Computer Servers

Tags: , , , ,

I have Dell 6800 server with PERC4 Ultra320 SCSI RAID controller with 256 MB cache.

I did some tests and I have found, that this cache is probably divided to cca 240 MB read cache and only 7 MB write cache. I have used xdd test tool to bypass filesystem cache and I was able to read 240 MB files with very high transfer rate while with 245 MB files transfer rate dropped to about 30%. Write test showed this transfer rate drop when file size changed from 7 MB to 8 MB.

I'd like to increase write portion of the cache. I'm using command line utility named megarc to set controller parameters and I can't see any parameter, that could affect cache division.

Does anybody know, whether it is possible to change the size of write cache on PERC4 controller ?Start Free Trial
[+][-]04.13.2007 at 01:59PM PDT, ID: 18908490

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[+][-]04.16.2007 at 01:04AM PDT, ID: 18916298

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[+][-]04.16.2007 at 06:17AM PDT, ID: 18917394

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[+][-]03.31.2008 at 11:38AM PDT, ID: 21247907

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[+][-]09.08.2008 at 03:05PM PDT, ID: 22422112

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[+][-]09.13.2008 at 12:32PM PDT, ID: 22469008

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About this solution

Zone: Computer Servers
Tags: cache, megarc, perc4, write, dell
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Solution Provided By: Computer101
Participating Experts: 2
Solution Grade: A
 
 
 
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