At 7:21 AM -0800 11/15/2011, Bruce Godfrey wrote:
do you have any data on how much difference a fast SCSI drive makes in a MDD
Multiple factors. The drive has to be able to throw data at x speed.
(read and write cycles are usually quite different)! The drive's
hardware cache has has be large enough to be able to buffer
sufficient data to keep both the mechanism and i/o bus busy. And the
i/o bus, be it IDE or SCSI or ..., has to be able to throw the data
quickly.
In my experience, the drive's capabilities are usually the bottleneck.
And be careful of the version and bit widths of the i/o bus.
Firewire, btw, is actually a form of SCSI 3.
Wikipedia has some very nice articles that include tables comparing
bus speeds...
As far as getting the best performance overall... Optimize speed,
capacity, and especially cost. Your best bet is a SATA controller
and 7200rpm or faster SATA drives. That way the drives are
inexpensive *and* usable in future machines!
fwiw,
- Dan.
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