Re: serveRAID M5014 SAS - Mailing list pgsql-performance

From Mark Kirkwood
Subject Re: serveRAID M5014 SAS
Date
Msg-id 4DE0CB33.5060703@catalyst.net.nz
Whole thread Raw
In response to Re: serveRAID M5014 SAS  (Grzegorz Jaśkiewicz <gryzman@gmail.com>)
List 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

pgsql-performance by date:

Previous
From: Grzegorz Jaśkiewicz
Date:
Subject: Re: serveRAID M5014 SAS
Next
From: Greg Smith
Date:
Subject: Re: The shared buffers challenge