Andrew Piskorski wrote:
On Sat, Apr 09, 2005 at 11:49:17AM -0400, Al Danial wrote:
Thanks to everyone who posted performance numbers and machine setup info. Some results were counterintuitive (I'd have guessed SCSI drives would come out on top) but many variables are at work
It is basically impossible that a 10k or 15k rpm SCSI disk is genuinely substantially slower for writes than a 7200 rpm IDE disk. Most likely, the SCSI disks had write-through cache turned off, and the IDE disks had it turned on.
This load is probably mostly sequential writes. The IDE drives I used were 200GB and have huge areal density, so their sequential write speed is probably a lot higher. SCSI'll win if there are seeks involved (or a drive like a WD Raptor).
--Andy
