From: | Rob Fielding <rob(at)dsvr(dot)net> |
---|---|
To: | pgsql-performance(at)postgresql(dot)org |
Subject: | Re: OT: Help with performance problems |
Date: | 2004-04-26 09:01:58 |
Message-ID: | 408CD006.3090004@dsvr.net |
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Thread: | |
Lists: | pgsql-performance |
scott.marlowe wrote:
> On Fri, 23 Apr 2004, Chris Hoover wrote:
>
>
>>DB's on Powervaults 220S using raid 5 (over 6 disks)
>
>
> What controller is this, the adaptec? We've found it to be slower than
> the LSI megaraid based controller, but YMMV.
Wow, really? You got any more details of the chipset, mobo and kernel
driver ?
I've been taken to my wits end wrestling with an LSI MegaRAID 320-1
controller on a supermicro board all weekend. I just couldn't get
anything more than 10MB/sec out of it with megaraid driver v1 OR v2 in
Linux 2.4.26, nor the version in 2.6.6-rc2. After 2 days of humming the
Adaptec mantra I gave in and switched the array straight onto the
onboard Adaptec 160 controller (same cable and everything). Software
RAID 5 gets me over 40MB sec for a nominal cpu hit - more than 4 times
what I could get out of the MegaRAID controller :( Even the 2nd SCSI-2
channel gets 40MB/sec max (pg_xlog :)
And HOW LONG does it take to detect drives during POST....ohhhh never
mind ... I really just wanna rant :) There should be a free counseling
service for enraged sysops.
--
Rob Fielding
rob(at)dsvr(dot)net
www.dsvr.co.uk Development Designer Servers Ltd
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