Alex Turner wrote:
> Does it really matter at which end of the cable the queueing is done
> (Assuming both ends know as much about drive geometry etc..)?
Good question. If the SCSI system was moving the head from track 1 to
10, and a request then came in for track 5, could the system make the
head stop at track 5 on its way to track 10? That is something that
only the controller could do. However, I have no idea if SCSI does
that.
The only part I am pretty sure about is that real-world experience shows
SCSI is better for a mixed I/O environment. Not sure why, exactly, but
the command queueing obviously helps, and I am not sure what else does.
--
Bruce Momjian | http://candle.pha.pa.us
pgman@candle.pha.pa.us | (610) 359-1001
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