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Re: 3ware vs Areca

From: Greg Smith <gsmith(at)gregsmith(dot)com>
To: Jeffrey Baker <jwbaker(at)gmail(dot)com>
Cc: Pgsql performance <pgsql-performance(at)postgresql(dot)org>
Subject: Re: 3ware vs Areca
Date: 2008-07-20 23:10:18
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Lists: pgsql-performance
On Tue, 15 Jul 2008, Jeffrey Baker wrote:

> Debian "etch", which has a 2.6.18 kernel.  I have contacted Areca
> support (as well as the linux-scsi mailing list) and their responses
> are usually either 1) upgrade the driver and/or firmware even though I
> have the latest drivers and firmware

Well, technically you don't have the latest driver, because that's the one 
that comes with the latest Linux kernel.  I'm guessing you have RHEL5 here 
from that fact that you're using 2.6.18.  I have a CentOS5 system here 
with an Areca card in it.  It installed it initially with the stock 2.6.18 
kernel there but it never worked quite right; all sorts of odd panics 
under heavy load.  All my problems went away just by moving to a generic 
2.6.22, released some time after the Areca card became of more first-class 
citizen maintained actively by the kernel developers themselves.

> 2) vague statements about the disk being incompatible with the 
> controller.

That sort of situation is unfortunate but I don't feel it's unique to 
Areca.  There's lots of reasons why some manufacturers end up with drives 
that don't work well with some controllers, and it is hard to assign blame 
when it happens.  There is something to be said for buying more integrated 
and tested systems; ultimately if you build stuff from parts, you're kind 
of stuck being the QA and that process presumes that you may discover 
incompatible combinations and punt them out in place of ones that do.

* Greg Smith gsmith(at)gregsmith(dot)com Baltimore, MD

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