Date: Thu, 19 Apr 2001 17:30:26 -0700 From: Mike Smith <msmith@freebsd.org> To: Andreas Braukmann <braukmann@tse-online.de> Cc: scsi@freebsd.org Subject: Re: IDE RAID Message-ID: <200104200030.f3K0URu00650@mass.dis.org> In-Reply-To: Your message of "Fri, 20 Apr 2001 00:35:05 %2B0200." <20010420003505.G33303@cage.tse-online.de>
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> 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.).
This is unsurprising. Most of the SCSI RAID controllers have 66MHz or
faster i960 processors with dedicated XOR acceleration hardware, wheras
the 3ware controller uses a 25Mhz 16-bit processor.
3ware's RAID5 support is there primarily as a checklist item; RAID5 just
doesn't make cost-effective sense for their market. You're better off
using a RAID10 setup.
> The conclusion (regarding cost/performance ratio) was pretty clear:
> Our new webserver machine got an 3Ware Escalade 6400 driving a
> RAID 0+1 Array.
This is the smartest approach, IMO.
--
... every activity meets with opposition, everyone who acts has his
rivals and unfortunately opponents also. But not because people want
to be opponents, rather because the tasks and relationships force
people to take different points of view. [Dr. Fritz Todt]
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