From: bert hubert <ahu@ds9a.nl>
To: Johannes Ruscheinski <ruschein@mail-infomine.ucr.edu>
Cc: Joel Jaeggli <joelja@darkwing.uoregon.edu>, linux-kernel@vger.kernel.org
Subject: Re: Best Low-cost IDE RAID Solution For 2.6.x? (OT?)
Date: Sun, 28 Dec 2003 22:56:44 +0100 [thread overview]
Message-ID: <20031228215644.GA32140@outpost.ds9a.nl> (raw)
In-Reply-To: <20031228213535.GA21459@mail-infomine.ucr.edu>
On Sun, Dec 28, 2003 at 01:35:35PM -0800, Johannes Ruscheinski wrote:
> Fisrt of all: thanks for the advice Joel! Two questions: why not use the
> hardware raid capability of the Promise tx4000 and if we'd use software
> raid instead, what would be the CPU overhead?
For the cost differential between linux native RAID and an external device
of similar capabilities, outfit yourself with an additional CPU. I don't use
RAID5 a lot but to a modern CPU, checksumming dozens of megabytes/second is
child's play:
raid5: measuring checksumming speed
8regs : 1479.600 MB/sec
32regs : 744.400 MB/sec
pIII_sse : 1649.200 MB/sec
pII_mmx : 1806.000 MB/sec
p5_mmx : 1915.200 MB/sec
raid5: using function: pIII_sse (1649.200 MB/sec)
This is on a 800MHz Celeron, so a recent >2Ghz system will do lots better
still.
--
http://www.PowerDNS.com Open source, database driven DNS Software
http://lartc.org Linux Advanced Routing & Traffic Control HOWTO
next prev parent reply other threads:[~2003-12-28 21:56 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-28 18:04 Best Low-cost IDE RAID Solution For 2.6.x? (OT?) Johannes Ruscheinski
2003-12-28 18:50 ` Joel Jaeggli
2003-12-28 21:35 ` Johannes Ruscheinski
2003-12-28 21:45 ` Arjan van de Ven
2003-12-28 22:14 ` Johannes Ruscheinski
2003-12-28 23:05 ` H. Peter Anvin
2003-12-29 1:18 ` Wakko Warner
2003-12-28 21:56 ` bert hubert [this message]
2003-12-28 23:36 ` Joel Jaeggli
2004-01-07 23:28 ` bill davidsen
2003-12-29 2:10 ` Samuel Flory
2003-12-29 13:41 ` Tomas Szepe
2003-12-29 18:59 ` Johannes Ruscheinski
2003-12-29 19:04 ` Samuel Flory
2003-12-29 19:06 ` Tomas Szepe
2003-12-30 0:03 ` Wakko Warner
2003-12-30 6:54 ` Tomas Szepe
2003-12-30 14:41 ` Wakko Warner
2003-12-30 20:58 ` Samuel Flory
2004-01-07 23:35 ` bill davidsen
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