From: Marc Bevand <bevand_m@epita.fr>
To: linux-raid@vger.kernel.org
Subject: Re: 1x 3ware controllers vs. 2x 3ware controllers
Date: Fri, 30 Jul 2004 17:00:51 +0200 [thread overview]
Message-ID: <cedoda$qn4$1@sea.gmane.org> (raw)
In-Reply-To: <200407300815.18296.mrwatts@fast24.co.uk>
Mark Watts wrote:
> With the performance issues I'm seeing with the 8506-4LP's I have, I wouldn't
> recommend them to anyone currently...
>
> The thread on LKML from a few days ago about mke2fs -j and 8506-4LP says it
> all, but basically and reasonable amount of I/O brings a Dual Opteron system
> to its knees.
> And by reasonable I mean copying ISO images from a usb2 drive to a raid 5 (4 x
> 250GB maxtor) or even just formatting a 600MB partition.
I would be interested to see the output of 'vmstat 1' while your system is
so slow.
IMHO you shouldn't draw such conclusion ("reasonable amount of I/O brings a
Dual Opteron system to its knees") from your particular case. The 3 HT links
of the Opteron make this CPU particularly adapted to I/O operations.
Personnaly, on a dual Opteron, I am able to read datas from 4 SATA disks at
about 225 MB/s, with CPU time used at about 32%, awd with a system still
reasonably responsive.
--
Marc Bevand http://www.epita.fr/~bevand_m
Computer Science School EPITA - System, Network and Security Dept.
next prev parent reply other threads:[~2004-07-30 15:00 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-30 3:53 1x 3ware controllers vs. 2x 3ware controllers Adam Hunt
2004-07-30 4:50 ` Scott T. Smith
2004-07-30 6:45 ` Luca Berra
2004-07-30 7:15 ` Mark Watts
2004-07-30 7:22 ` Mark Watts
2004-07-30 8:14 ` Scott T. Smith
2004-07-30 15:00 ` Marc Bevand [this message]
2004-07-30 16:17 ` Mark Watts
2004-07-30 23:53 ` Jim Buttafuoco
2004-07-31 8:49 ` Mikael Abrahamsson
2004-07-31 14:24 ` Jon Lewis
2004-07-31 16:28 ` Mikael Abrahamsson
2004-07-31 16:42 ` Mark Watts
2004-07-31 17:40 ` Jurriaan
2004-08-01 7:00 ` Mikael Abrahamsson
2004-08-01 7:08 ` Gordon Henderson
2004-08-01 9:18 ` Mikael Abrahamsson
2004-08-01 9:51 ` Mark Watts
2004-08-01 12:11 ` Mikael Abrahamsson
2004-08-01 15:01 ` Mark Watts
2004-08-01 15:10 ` Jim Buttafuoco
2004-08-01 15:27 ` Mikael Abrahamsson
2004-08-01 15:33 ` Mark Watts
2004-08-01 17:18 ` Gordon Henderson
2004-08-02 12:54 ` Mark Watts
2004-08-02 13:04 ` Gordon Henderson
2004-08-02 9:40 ` Mark Watts
2004-08-03 1:58 ` [RAID] " Julian Cowley
2004-08-03 2:05 ` Definition of hotswap, was " Scott T. Smith
2004-08-03 11:55 ` Tim Small
2004-08-22 17:52 ` Maurice Hilarius
2004-08-03 11:47 ` Software vs. Hardware RAID Tim Small
2004-08-03 15:58 ` Ricky Beam
2004-08-01 15:06 ` 1x 3ware controllers vs. 2x 3ware controllers Jim Buttafuoco
2004-08-01 15:24 ` Mikael Abrahamsson
2004-08-01 17:57 ` Scott T. Smith
2004-08-01 19:28 ` David Greaves
2004-08-01 22:32 ` Mikael Abrahamsson
2004-08-02 18:02 ` Mark Hahn
2004-08-02 18:07 ` Scott T. Smith
2004-08-01 17:53 ` Scott T. Smith
2004-08-02 10:22 ` what is the best multi-SATA-controller-on-a-single-board out there? Tim Small
2004-08-02 21:09 ` Jon Lewis
2004-08-02 22:48 ` robin-lists
2004-08-03 8:55 ` Tim Small
2004-08-03 17:45 ` Jon Lewis
2004-08-04 8:24 ` Tim Small
2004-07-31 13:11 ` 1x 3ware controllers vs. 2x 3ware controllers Joshua Baker-LePain
-- strict thread matches above, loose matches on Subject: below --
2004-07-30 10:16 Mark Watts
2004-07-30 12:59 ` Joshua Baker-LePain
2004-07-30 13:24 ` Mark Watts
2004-07-30 13:30 ` Joshua Baker-LePain
2004-07-31 8:44 ` Mikael Abrahamsson
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