From: Jeff Garzik <jgarzik@pobox.com>
To: "Rev. Jeffrey Paul" <sneak@datavibe.net>
Cc: Joshua Baker-LePain <jlb17@duke.edu>, linux-raid@vger.kernel.org
Subject: Re: 3ware escalade vs software raid, from a different jeff
Date: Thu, 19 Feb 2004 19:38:51 -0500 [thread overview]
Message-ID: <4035571B.505@pobox.com> (raw)
In-Reply-To: <20040219175630.GA20790@datavibe.net>
Rev. Jeffrey Paul wrote:
> I have always avoided the promise fasttrak cards for exactly that
> reason ("hardware" being in quotes). It's my understanding that
> they're not much more than their udma cards with drivers that do most
> of the RAIDing.
Actually, Promise is one of the very few companies that are doing
something innovative in RAID... Their hardware is not 100% software
RAID nor 100% hardware RAID. They instead follow the model of network
cards -- perform all key operations on the board, and let the host CPU
handle the rest.
> It was also my understanding that the 3ware cards are true hardware
> raid and are up to the task of something like this, which would also
> explain why they're 4x the cost.
Correct.
> I am looking at a four disk raid5 or raid10, and it seems like
> the interrupt load from four drives on four channels might be a bit
> excesive. I'm going to be running critical services on the machine
> that the drives are in (namely mysql and nfs) and don't want to worry
> about performance.
Once your spindles can max out your PCI bus bandwidth, -then- you can
start worrying about PCI bandwidth and interrupt load ;-)
Jeff
next prev parent reply other threads:[~2004-02-20 0:38 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-18 21:48 3ware escalade vs software raid, from a different jeff Rev. Jeffrey Paul
2004-02-18 22:58 ` Jeff Garzik
2004-02-19 11:49 ` Holger Kiehl
2004-02-19 12:06 ` Joshua Baker-LePain
2004-02-19 17:56 ` Rev. Jeffrey Paul
2004-02-19 19:58 ` Michael
2004-02-19 20:18 ` Ricky Beam
2004-02-19 22:04 ` Scsi adapters and software raid Bob Hillegas
2004-02-20 0:33 ` Kanoa Withington
2004-02-20 4:27 ` Jeff Garzik
2004-02-19 22:33 ` 3ware escalade vs software raid, from a different jeff Scott Long
2004-02-19 23:52 ` Guy
2004-02-19 22:29 ` Scott Long
2004-02-20 4:26 ` Jeff Garzik
2004-02-20 4:40 ` Scott Long
2004-02-20 0:38 ` Jeff Garzik [this message]
2004-02-20 7:19 ` Joshua Baker-LePain
2004-02-19 12:11 ` Måns Rullgård
2004-02-19 12:32 ` Holger Kiehl
2004-02-19 12:32 ` Jeff Garzik
-- strict thread matches above, loose matches on Subject: below --
2004-02-23 22:23 Jeff Gray
2004-02-24 8:06 ` Holger Kiehl
2004-02-24 14:16 ` Joshua Baker-LePain
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