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Re: Slow Performance on a XEON E5504

From: Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>
To: Felix Schubert <input(at)fescon(dot)de>
Cc: "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Slow Performance on a XEON E5504
Date: 2012-08-25 13:04:51
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Lists: pgsql-performance
On Sat, Aug 25, 2012 at 6:59 AM, Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> wrote:
> On Sat, Aug 25, 2012 at 6:53 AM, Felix Schubert <input(at)fescon(dot)de> wrote:
>> Hi Scott,
>> the controller is a HP i410 running 3x300GB SAS 15K / Raid 5
> Well it sounds like it does NOT have a battery back caching module on
> it, am I right?

Also what software did you use to benchmark your drive subsystem?
Bonnie++ is a good place to start.  There are better suites out there
but it's been a while for me since I've used them.

Also note the HP i410 is not the fastest RAID controller ever, but it
should be faster than this if it has a battery backed cache on it
which will allow write-back operation.  Without it the controller will
default to write-through, which is much slower.

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