Date: Sun, 21 Jan 1996 14:41:25 -0800 (PST) From: Jaye Mathisen <mrcpu@cdsnet.net> To: "Justin T. Gibbs" <gibbs@freefall.freebsd.org> Cc: hackers@freebsd.org Subject: Re: some RAID numbers. Message-ID: <Pine.BSF.3.91.960121143732.9517V-100000@schizo.cdsnet.net> In-Reply-To: <199601212202.OAA09307@freefall.freebsd.org>
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On Sun, 21 Jan 1996, Justin T. Gibbs wrote: > > > >Adjile RAID box, 5 Fuji 4GB disks, RAID 5, verify off (on cache), 8MB cache. > > > >P5120, 64MB RAM, FBSD 2.1 stable (supped 1/21), Adapter 2940UW, tag enabled. > > How many tags? The default is only two unless you play around with the > stuff around QUEUE_FULL_SUPPORTED in i386/scsi/aic7xxx.c Whatever is default, I didn't touch anything other than the kernel config file. > > <Benchmarks deleted> > > These numbers seem rather low. What is the performance of the individual > fujitsu drives. Running bonnie on a single Quantum Atlas will blow > these numbers away. Are you doing RAID 5? Even with RAID 5, I would > still expect much better numbers. Well, I ran raid 0, and it hauled butt. These numbers compare pretty well with a RAID box we have on an alpha under OSF with a mylex card. I've never seen a RAID 5 that can do better than single spindle speed, it would seem difficult to do, given the read write cycle. Note also that I did say the FS was partially used, nor was the box completely idle. (although there were no processes accessing that controller/card other than mine. I'd like to see the output from bonnie, just so I have some comparisons. I have a barracuda with a 2940, and I don't see much better numbers.
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