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From: Mark Kirkwood <mark.kirkwood@catalyst.net.nz>
To: Grzegorz Jaśkiewicz <gryzman@gmail.com>
Cc: Kevin Grittner <Kevin.Grittner@wicourts.gov>
Cc: Greg Smith <greg@2ndquadrant.com>
Cc: postgres performance list <pgsql-performance@postgresql.org>
Subject: Re: serveRAID M5014 SAS
Date: Sat, 28 May 2011 22:15:15 +1200
Message-ID: <4DE0CB33.5060703@catalyst.net.nz> (raw)
In-Reply-To: <BANLkTimiYqgbTBqhC9Ad0VgiE3Efo=UK7Q@mail.gmail.com>
References: <BANLkTi=fE2YCS0Lra42ei1hFrKqXdVk2jA@mail.gmail.com>
	<4DDD81BB.4080801@catalyst.net.nz>
	<4DDD85C7.6030109@catalyst.net.nz>
	<BANLkTi=PAymQvudx1eyuuOV9vAAoydan9g@mail.gmail.com>
	<4DDE0E77.6070804@catalyst.net.nz>
	<4DDEDFFF.1060304@2ndquadrant.com>
	<4DDEE0CF.5040800@catalyst.net.nz>
	<4DDEE580.3040305@catalyst.net.nz>
	<4DDF7110020000250003DDD4@gw.wicourts.gov>
	<4DE032BB.1070401@catalyst.net.nz>
	<BANLkTimiYqgbTBqhC9Ad0VgiE3Efo=UK7Q@mail.gmail.com>

On 28/05/11 21:42, Grzegorz Jaśkiewicz wrote:
> Yeah, I got it Mark.
>
> Unfortunately my current management decided to suspend that
> investigation for a while, so I can't get any tests done or anything
> like that.
>
> However we found out that another server we have shows similar issues.
> The same card, slightly different motherboard and completely different
> disks.
> The basic issue is around concurrent reads and writes. The card is
> ok-ish when one process hammers the disks, but as soon as it is
> multiple ones - it just blows (and I use it as a technical term ;) ).
> Still, with only one process reading/writing - the raid card sucks big
> time performance wise.
>

Sorry, Grzegorz I didn't mean to suggest you were not listening, I meant 
to ask if you could run the megaraid cli command to see if it showed up 
a battery!

If/when your management decide to let you look at this again, I'll be 
happy to help if I can!

Best wishes

Mark



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