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Re: RAID Stripe size

From: evgeny gridasov <eugrid(at)fpm(dot)kubsu(dot)ru>
To: "bm\\mbn" <miki(at)canaan(dot)co(dot)il>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: RAID Stripe size
Date: 2005-09-20 10:53:07
Message-ID: 20050920145307.1a111595.eugrid@fpm.kubsu.ru (view raw or flat)
Thread:
Lists: pgsql-performance
Hi Everybody!

I've got a spare machine which is 2xXEON 3.2GHz, 4Gb RAM
14x140Gb SCSI 10k (LSI MegaRaid 320U). It is going into production in 3-5months.
I do have free time to run tests on this machine, and I could test different stripe sizes
if somebody prepares a test script and data for that.

I could also test different RAID modes 0,1,5 and 10 for this script.

I guess the community needs these results.

On 16 Sep 2005 04:51:43 -0700
"bm\\mbn" <miki(at)canaan(dot)co(dot)il> wrote:

> Hi Everyone
> 
> The machine is IBM x345 with ServeRAID 6i 128mb cache and 6 SCSI 15k
> disks.
> 
> 2 disks are in RAID1 and hold the OS, SWAP & pg_xlog
> 4 disks are in RAID10 and hold the Cluster itself.
> 
> the DB will have two major tables 1 with 10 million rows and one with
> 100 million rows.
> All the activities against this tables will be SELECT.
> 
> Currently the strip size is 8k. I read in many place this is a poor
> setting.
> 
> Am i right ?

-- 
Evgeny Gridasov
Software Developer
I-Free, Russia

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