topic HP Smart Array 6402 Cache config in Disk Enclosures

HP Smart Array 6402 Cache config

TomasD — Thu, 11 Jan 2007 04:37:34 GMT

Hi,
I've got HP Smart Array 6402 there's battery backed ram on it that I've recently upgraded from 128mb to 512mb, under the System Management Homepage, Home -> Storage ->Smart Array 6400 Controller in Slot 1, Accelerator section I've got following:
<...>
Total Memory: 576 MB
Read Cache: 50%
Write Cache: 50%
<...>
I was wondering if it's possible to change memory percentages for reading writing? This is file server and as I know the optimal configuration for file server is
80% read
20% write

Also is there any way of monitoring current write and read memory loads on the cache?

Thanks all for your help

Re: HP Smart Array 6402 Cache config

Rob Leadbeater — Thu, 11 Jan 2007 08:18:12 GMT

Hi,

You should be able to change the cache ratio from the ACU (Array Configuration Utility).

Cheers,

Rob

Re: HP Smart Array 6402 Cache config

mits — Fri, 12 Jan 2007 03:33:53 GMT

See section "Changing the controller cache ratio" of HP Array Configuration Utility
User Guide. See section "ReadCache, WriteCache" as well.

Syntax:
modify cr=#/#|?
where is a controller, and #/# is the cache ratio in the format read percentage/write
percentage.
Example command:
=> ctrl slot=3 modify cr=25/75

Re: HP Smart Array 6402 Cache config

TomasD — Fri, 12 Jan 2007 04:17:44 GMT

Thanks to both of you, you've been a great help! I found it! (:

Re: HP Smart Array 6402 Cache config

TomasD — Fri, 12 Jan 2007 05:53:06 GMT

works