Date: Tue, 21 Aug 2001 02:04:39 +0200 From: "Jose M. Alcaide" <jose@we.lc.ehu.es> To: Bryan-TheBS-Smith <b.j.smith@ieee.org> Cc: Darryl Okahata <darrylo@soco.agilent.com>, Hodge Podge <nicole@unixgirl.com>, freebsd-hardware@FreeBSD.ORG, mike.wentz@3ware.com Subject: Re: 3ware stuff not ready for heavy duty useage-followup Message-ID: <20010821020439.A66366@v-ger.we.lc.ehu.es> In-Reply-To: <3B813DD5.A86E2016@ieee.org>; from b.j.smith@ieee.org on Mon, Aug 20, 2001 at 12:41:57PM -0400 References: <200108201630.JAA00644@mina.soco.agilent.com> <3B813DD5.A86E2016@ieee.org>
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On Mon, Aug 20, 2001 at 12:41:57PM -0400, Bryan-TheBS-Smith wrote:
>
> I recently bought a 3Ware 6200. Before I did anything, I updated my
> firmware (with the late June release) and then created the RAID-0 array
> (two Maxtor 80GB drives). 0 problems so far at just under 2 months, I
> hope I continue to have none either.
>
> I'm now looking to buy a 4-channel and 8-channel card. I am on various
> lists (XFS, Linux, NFS, etc...) where people have had issues with 3Ware
> 6000-series cards with RAID-5 volumes, but no one is having issues with
> RAID-0, 1 or 0+1 (aka 10). Plus the RAID-5 write performance on the
> 6000-series is not optimal (although the 7000-series is supposed to
> change that). So I think I'm going to stick with RAID-0+1 for these
> drives, even if it means losing a 80-240GB in effective disk space
> verses RAID-5 (160GB instead of 240GB on the 4-channel, and 320GB
> instead of 560GB on the 8-channel).
>
> Any comments? I know this is a FreeBSD list, but I want to hear if
> anyone has any comments on this.
>
I have a system with an Escalade 6200 and two IBM DTLA-307075 (75 GB)
in a RAID-0 configuration. Also, I recently installed an Escalade 7410 on
another system, this time with four DTLA-307075 attached in RAID-5 mode.
No problems so far. Moreover, the RAID-5 performs quite well:
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
256 7996 18.9 8189 6.3 5743 5.2 28958 95.5 73159 44.2 1148.9 5.7
1024 7962 17.4 8006 6.2 5818 5.2 29244 95.5 70261 42.5 338.4 2.1
Obviously the write performance is not impressive, but it is a RAID-5.
OTOH, the read throughput is *fast*.
Cheers,
JMA
--
****** Jose M. Alcaide // jose@we.lc.ehu.es // jmas@FreeBSD.org ******
** "Beware of Programmers who carry screwdrivers" -- Leonard Brandwein **
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