Date: Fri, 7 Apr 1995 00:30:09 -0400 (EDT) From: Sujal Patel <smpatel@wam.umd.edu> To: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> Cc: hackers@FreeBSD.org Subject: Re: large filesystems/multiple disks [RAID] Message-ID: <Pine.BSD.3.91.950407002535.145B-100000@xi.dorm.umd.edu> In-Reply-To: <199504062222.PAA05304@gndrsh.aac.dev.com>
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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
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