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Re: Adaptec 5805 SAS Raid

From: Leigh Dyer <leigh(at)eclinic(dot)com(dot)au>
To: Glyn Astill <glynastill(at)yahoo(dot)co(dot)uk>, "Pgsql-Performance ((E-mail))" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Adaptec 5805 SAS Raid
Date: 2008-03-14 22:34:08
Message-ID: 47DAFD60.1090602@eclinic.com.au (view raw or flat)
Thread:
Lists: pgsql-performance
Glyn Astill wrote:
> Any of you chaps used this controller?
> 

It looks very similar to the rebadged Adaptec that Sun shipped in the 
X4150 I ordered a few weeks ago, though the Sun model had only 256MB of 
cache RAM. I was wary of going Adaptec after my experiences with the 
PERC/3i, which couldn't even seem to manage a single disk's worth of 
read performance from a RAID-1 array, but I was pleasantly surprised by 
this card. I'm only running a RAID-1 array on it, with 2 146GB 10krpm 
SAS drives, but I was impressed with the read performance -- it seems 
quite happy to split sequential reads across the two disks.

Here are the bonnie++ numbers I took during my run-in testing:

Version  1.03       ------Sequential Output------ --Sequential Input- 
--Random-
                     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- 
--Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP 
/sec %CP
membrane        12G 54417  89 86808  15 41489   6 59517  96 125266  10 
629.6   0
                     ------Sequential Create------ --------Random 
Create--------
                     -Create-- --Read--- -Delete-- -Create-- --Read--- 
-Delete--
files:max:min        /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP 
/sec %CP
membrane         16 19496  97 +++++ +++ 14220  68  7673  40 +++++ +++ 
5246  26

I'm not sure if I'd yet be comfortable running a larger array for a 
database on an Adaptec card, but it's definitely a great improvement on 
the earlier Adaptec hardware I've used.

Thanks
Leigh

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