About the time it attempts to support 16-60 drives on one controller
(15 targets, 4 luns per target), with full asynchronous operation.
The costs start accumulating with the async operation.
I've always treated IDE as only part - the controller sharing the equivalent
of a single SCSI target, with two luns. The PCI interface appears about
equivalent to that of the SCSI controller, but the IDE controller completely
drops the multiple target feature (as well as the shared data/command bus).
IDE boards with 4 drives seem to be two IDE controllers using the same PCI
interface.
In my experience, SCSI is not cost effective for systems with a single disk.
As soon as you go to 4 or more disks, the throughput of SCSI takes over unless
you are expanding a pre-existing workstation configuration.
-------------------------------------------------------------------------
Jesse I Pollard, II
Email: pollard@navo.hpc.mil
Any opinions expressed are solely my own.
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