From: "Bill Rugolsky Jr." <rugolsky@ead.dsa.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-kernel@vger.kernel.org, lm@bitmover.com, jgiglio@smythco.com
Subject: Re: 3ware discontinuing the Escalade Series
Date: Fri, 5 Oct 2001 14:22:15 -0400 [thread overview]
Message-ID: <20011005142215.C1221@ead45> (raw)
In-Reply-To: <20011005125259.B1221@ead45> <E15pYQ1-00071M-00@the-village.bc.nu>
In-Reply-To: <E15pYQ1-00071M-00@the-village.bc.nu>; from alan@lxorguk.ukuu.org.uk on Fri, Oct 05, 2001 at 06:05:49PM +0100
On Fri, Oct 05, 2001 at 06:05:49PM +0100, Alan Cox wrote:
> > I really like my 7800. At this point I guess I'm going to convert from
> > hard to soft RAID, on the theory that (unfixed) bugs in the firmware are less
> > likely to botch JBOD.
>
> Except for RAID5 the softraid is also likely to outperform a hardware raid
> controller. With RAID5 its a CPU usage tradeoff
Nod. I tested both configurations when I first got the cards, and
RAID0 and RAID10 tests with a dual Athlon and the 3ware 7800 showed Linux
soft-RAID outperforming. I didn't save the hard-RAID results, but the following
is from a private e-mail I sent early in the summer:
RedHat 2.4.5-10smp on dual-Athlon 1.2GHz, 1GB RAM
Soft RAID0 with 4 IBM 41GB 7200RPM ATA-100 drives, chunk size 32K
ext2 w/4K blocks:
Version 1.01c ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
Tyan Thunder 10G 68828 99 138838 75 47756 33 48848 90 116166 61 229.2 1
K7 1.2GHz ------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 1208 100 +++++ +++ 16883 94 1220 100 +++++ +++ 4476 99
I've been using hard-RAID simply because I've been playing with ext3
and LVM, and eliminating MD was one less interaction to worry about until now.
-Bill Rugolsky
next prev parent reply other threads:[~2001-10-05 18:22 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-10-04 18:19 Jason Giglio
2001-10-05 16:09 ` Larry McVoy
2001-10-05 16:52 ` rugolsky
2001-10-05 16:56 ` Larry McVoy
2001-10-05 17:05 ` Alan Cox
2001-10-05 18:22 ` Bill Rugolsky Jr. [this message]
2001-10-05 18:39 ` Jeff V. Merkey
2001-10-05 16:49 Ryan C. Bonham
2001-10-05 17:05 ` Wilson
2001-10-05 17:13 ` Alan Cox
2001-10-05 17:10 ` Alan Cox
2001-10-05 17:21 ` Joel Jaeggli
2001-10-08 17:38 ` Mike Panetta
2001-10-08 18:38 ` Joel Jaeggli
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