From: Greg Smith <greg@2ndquadrant.com>
To: Scott Marlowe <scott.marlowe@gmail.com>
Cc: Dan Birken <birken@gmail.com>
Cc: pgsql-performance <pgsql-performance@postgresql.org>
Subject: Re: Which RAID Controllers to pick/avoid?
Date: Thu, 03 Feb 2011 01:15:32 -0500
Message-ID: <4D4A4804.3040307@2ndquadrant.com> (raw)
In-Reply-To: <AANLkTinB98Wgk+pzA_A9Ro=LTtmJJXFrkLVVM6h_d+AP@mail.gmail.com>
References: <AANLkTimyRh1ieWxpCo1ht2D1fkmL+Ca_8ABBEw6yN2WR@mail.gmail.com>
<4D4A411A.3040102@2ndquadrant.com>
<AANLkTinB98Wgk+pzA_A9Ro=LTtmJJXFrkLVVM6h_d+AP@mail.gmail.com>
Scott Marlowe wrote:
> On Wed, Feb 2, 2011 at 10:46 PM, Greg Smith <greg@2ndquadrant.com> wrote:
>
>> example. Scott Marlowe was griping recently about a similar issue in some
>> of the LSI models, too. I suspect it's a problem impacting several of the
>> larger RAID cards that use the big Intel IOP processors for their RAID
>> computations, given that's the part with the heatsink on it.
>>
>
> Specifically the LSI 8888 in a case that gave very low amounts of air
> flow over the RAID card. The case right above the card was quite hot,
> and the multilane cable was warm enough to almost burn my fingers whe
Interesting...that shoots down my theory. Now that I check, the LSI
8888 uses their SAS1078 controller, which is based on a PowerPC 440
processor--it's not one of the Intel IOP processors at all. The 8308
Dan has as an option is using the very popular Intel IOP333 instead,
which is also used in some Areca 1200 series cards (1220/1230/1260).
The Adaptec 5405 and 5805 cards both use the Intel IOP348, as does the
Areca 1680. Areca puts a fan right on it; Adaptec does not. I
suspect the only reason the 5805 cards have gotten more reports of
overheating than the 5405 ones is just because having more drives
typically connected increases their actual workload. I don't think
there's actually any difference between the cooling situation between
the two otherwise.
--
Greg Smith 2ndQuadrant US greg@2ndQuadrant.com Baltimore, MD
PostgreSQL Training, Services, and 24x7 Support www.2ndQuadrant.us
"PostgreSQL 9.0 High Performance": http://www.2ndQuadrant.com/books
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-performance@postgresql.org
Cc: greg@2ndquadrant.com, scott.marlowe@gmail.com, birken@gmail.com
Subject: Re: Which RAID Controllers to pick/avoid?
In-Reply-To: <4D4A4804.3040307@2ndquadrant.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox