From owner-freebsd-scsi Thu Apr 19 21:28: 3 2001 Delivered-To: freebsd-scsi@freebsd.org Received: from mass.dis.org (mass.dis.org [216.240.45.41]) by hub.freebsd.org (Postfix) with ESMTP id 1A59137B43F for ; Thu, 19 Apr 2001 21:27:57 -0700 (PDT) (envelope-from msmith@mass.dis.org) Received: from mass.dis.org (msmith@localhost [127.0.0.1]) by mass.dis.org (8.11.2/8.11.2) with ESMTP id f3K0URu00650; Thu, 19 Apr 2001 17:30:30 -0700 (PDT) (envelope-from msmith@mass.dis.org) Message-Id: <200104200030.f3K0URu00650@mass.dis.org> X-Mailer: exmh version 2.1.1 10/15/1999 To: Andreas Braukmann Cc: scsi@freebsd.org Subject: Re: IDE RAID In-reply-to: Your message of "Fri, 20 Apr 2001 00:35:05 +0200." <20010420003505.G33303@cage.tse-online.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Thu, 19 Apr 2001 17:30:26 -0700 From: Mike Smith Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > 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] V I C T O R Y N O T V E N G E A N C E To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message