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Re: serveRAID M5014 SAS

From: Mark Kirkwood <mark(dot)kirkwood(at)catalyst(dot)net(dot)nz>
To: Grzegorz Jaśkiewicz <gryzman(at)gmail(dot)com>
Cc: Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, Greg Smith <greg(at)2ndquadrant(dot)com>, postgres performance list <pgsql-performance(at)postgresql(dot)org>
Subject: Re: serveRAID M5014 SAS
Date: 2011-05-28 10:15:15
Message-ID: 4DE0CB33.5060703@catalyst.net.nz (view raw or flat)
Thread:
Lists: pgsql-performance
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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