I have been doing some research on the benefits of SCSI over IDE.
Seems the magic ingredient in SCSI that makes it superior is that the SCSI
controller handles the data read/write requests for the CPU, where IDE relys
on the CPU to do the task.
This might explain why Apple went SCSI and not IDE and why typically Mac
performance was superior to the PC's all things being the same other than
drive (and the choking Windoze OS). And might also be why Mac's don't need
near as much RAM as PC's.
BUT, in my "informal" SCSI tests for my 9500/150 with internal Fast SCSI
(AKA SCSI2, 10MB/sec) I could cmd "D" a file of 101MB and dup it in 52
seconds. Pretty slow in my book. That is a whopping 1.94 MB/Sec. I did
similar tests with randomly sized files and got 75 seconds for 101MB. So it
hurt some, but not too bad.
My friend with a 700 MHzish Celeron PC and ATA100, with Win2K did it in 4
seconds. So, 25 MB/sec. A little bit faster eh? When he did the test with
smaller files it slowed a larger % than the SCSI did. Here SCSI helps.
He also has a ATA33 3.5GB drive and it took 25 seconds to do the same file.
So ATA33 is pretty slow, but still smoked my Fast SCSI.
So, bottom line, do you LOSE performance on an older machine doing to IDE
over SCSI? Don't know, need a ATA100 card and drive to find out. The slow
processor might be my limiting factor.
Anyone out there can dup these crude tests (although very real world), make
a .sit file of something around 100 MB, duplicate it, and time how long it
takes to duplicate it. I really would like to see some slower and faster
machines of SCSI and ATA Mac's do this.
If you can email me directly with the data, I would gladly make a
spreadsheet of it and make it available to anyone who wants it.
Just dup a 100MB file, and then dup a 100 MB folder with lots of small stuff
in it, time both and give me your combo.
(I would really like to see a upgraded 9500 to G3 or G4 do the same test
with standard Fast SCSI doing it. And then one with a SCSI160 card too)
Thanks!
Thomas Martin
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