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From: Greg Smith <gsmith@gregsmith.com>
Cc: Sean Davis <sdavis2@mail.nih.gov>
Cc: pgsql-performance@postgresql.org
Subject: Re: [OT] RAID controllers blocking one another?
Date: Thu, 17 Jan 2008 18:23:47 -0500 (EST)
Message-ID: <Pine.GSO.4.64.0801171807060.18514@westnet.com> (raw)
In-Reply-To: <dcc563d10801171307p4869b0ayc27c3433c19455ba@mail.gmail.com>
References: <264855a00801171217m4e6211e6y5f4d0e12ce86db5c@mail.gmail.com>
	<dcc563d10801171307p4869b0ayc27c3433c19455ba@mail.gmail.com>

On Thu, 17 Jan 2008, Scott Marlowe wrote:

> On Jan 17, 2008 2:17 PM, Sean Davis <sdavis2@mail.nih.gov> wrote:
>> two3-ware cards, one 9640SE-24 and one 9640SE-16
> Sounds like they're sharing something they shouldn't be.  I'm not real
> familiar with PCI-express.  Aren't those the ones that use up to 16
> channels for I/O?  Can you divide it to 8 and 8 for each PCI-express
> slot in the BIOS maybe, or something like that?

I can't find the 9640SE-24/16 anywhere, but presuming these are similar to 
(or are actually) the 9650SE cards then each of them is using 8 lanes of 
the 16 available.  I'd need to know the exact motherboard or system to 
even have a clue what the options are for adjusting the BIOS and whether 
they are shared or independant.

But I haven't seen one where there's any real ability to adjust how the 
I/O is partitioned beyond adjusting what slot you plug things into so 
that's probably a dead end anyway.  Given the original symptoms, one thing 
I would be suspicious of though is whether there's some sort of IRQ 
conflict going on.  Sadly we still haven't left that kind of junk behind 
even on current PC motherboards.

--
* Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD



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