Date: Fri, 20 Apr 2001 00:35:05 +0200 From: Andreas Braukmann <braukmann@tse-online.de> To: scsi@freebsd.org Subject: Re: IDE RAID Message-ID: <20010420003505.G33303@cage.tse-online.de> In-Reply-To: <200104191949.f3JJnge01789@mass.dis.org>; from msmith@freebsd.org on Thu, Apr 19, 2001 at 12:49:42PM -0700 References: <Pine.BSF.4.21.0104020919310.64972-100000@astro.ioffe.rssi.ru> <200104191949.f3JJnge01789@mass.dis.org>
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Hi,
On Thu, Apr 19, 2001 at 12:49:42PM -0700, Mike Smith wrote:
> > BWT, is 3ware supported by FreeBSD in raid5 mode?
> > 'man twe' tells only about 0 and 1 somewhy.
>
> Yes, it is. I haven't had any time lately to test it, but it's known to
> work.
Yes, it just works. But the 3ware's current implementation seems
to be not that efficient (compared to lowend SCSI-RAID-controllers
like the Mylex 160/170 e.g.).
My observation so far:
RAID 0+1 => the 3ware (with 4 IBM drives) clearly outperforms
the Mylex. The Mylex seems not be able to keep up
with the speed of 4 modern SCSI harddrives (IBM DTYS
or even with the older DNES).
RAID 5 => the Mylex 170 clearly outperforms the 3ware.
Sorry, I didn't archived my bonnie and rawio results :(.
The conclusion (regarding cost/performance ratio) was pretty clear:
Our new webserver machine got an 3Ware Escalade 6400 driving a
RAID 0+1 Array.
-Andreas
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