Date: Sun, 21 May 2000 08:21:10 -0400 (EDT) From: Kenneth W Cochran <kwc@world.std.com> To: freebsd-scsi@freebsd.org Subject: SCSI 2x-4x slower than IDE? Message-ID: <200005211221.IAA01609@world.std.com>
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Hello -scsi, (Yes, the old SCSI vs IDE flamewar, but I'd like to avoid that, thank you... :) This is related to FreeBSD because I'm considering these devices for a FreeBSD box... :) A recent message on this list spoke to this issue in general but I could use some info as to the specifics, if possible. Partly on my recommendation, a freind of mine tried SCSI as a proposed upgrade to his old IDE system. He is/was interested in improving performance with sequential saves while editing & cd-burning music (live recorded recitals). File sizes are in the 10s & possibly 100s of mb. He got a Tekram DC-390U2W & an IBM Ultrastar DNES-318350. There are/were a couple of other previous scsi peripherals (older IBM hdd & a tape drive, I think) running on an Adaptec 2910. OS is Win9x (not sure exactly which). What happened: Sequential saves with older scsi disk (vs older ide) took twice as long, & sequential saves with new IBM took twice as long as with older scsi disk. The file/save on the ide took about 4 minutes, the "old" scsi disk (an IBM) took 8 minutes & the new IBM DNES took 15m:21s. His IDE is not even the newer, supposedly faster, stuff. I've always read & heard that Unix in general & FreeBSD more specifically perform much better with scsi hdds than ide (better, more intelligent i/o, "multithreadedness," multitasking, etc.), & that this might not be the case with Win9x, due to its "single-threaded" nature, but would that account for this magnitude of performance difference? I've always been quite satisfied with scsi & unhappy with ide for systems I've built & used (Unix, Linux, *BSD). 2 questions: 1. What's going on "here" in M$/Win9x? 2. What does this imply (or not imply) for FreeBSD? FAQ, -doc, & other reference pointers are, of course, quite welcome. :) Thanks, -kc To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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