From owner-freebsd-hackers Thu Apr 6 21:30:25 1995 Return-Path: hackers-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id VAA21896 for hackers-outgoing; Thu, 6 Apr 1995 21:30:25 -0700 Received: from xi.dorm.umd.edu (xi.dorm.umd.edu [129.2.140.12]) by freefall.cdrom.com (8.6.10/8.6.6) with ESMTP id VAA21890 for ; Thu, 6 Apr 1995 21:30:24 -0700 Received: (from smpatel@localhost) by xi.dorm.umd.edu (8.6.11/8.6.9) id AAA00501; Fri, 7 Apr 1995 00:30:09 -0400 Date: Fri, 7 Apr 1995 00:30:09 -0400 (EDT) From: Sujal Patel X-Sender: smpatel@xi.dorm.umd.edu To: "Rodney W. Grimes" cc: hackers@FreeBSD.org Subject: Re: large filesystems/multiple disks [RAID] In-Reply-To: <199504062222.PAA05304@gndrsh.aac.dev.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: hackers-owner@FreeBSD.org Precedence: bulk On Thu, 6 Apr 1995, Rodney W. Grimes wrote: > The drive has a 5 year warranty, so it's not like your buying a very > used drive. Or make me an offer if you think $800 is too much for > it. > > My DAT drive should be in next week so I am not worried about disk > failure causing me to lose data with stripped disks. > > I have read the code in stripe.tar, it should be a day or twos work > to get it up and running under FreeBSD. A good question is, can you get this to improve raw throughput much? I began implementing striped disks on L*nux a while back with two 730 Meg Quantum Lightnings on a U24F, and got no improvement in speed at all. I did implement it at the block device level with a few lower level hacks, so that may have been a problem with the way I designed it, but what kind of SCSI card do you expect to push more than 3-5 Megs/Sec. My 24F can't put out more than 2.3 megs/sec sustained from the FileSystem (I think my drives should be able to do better than this). Sujal