I agree with you, but I'm gonna throw my $.02 in just to confuse things
some more... ;>
I recently got to test SCSI vs IDE drives in the same system. My tests
involved raw disk read (with hdparm), filesystem access (by making a
backup), and loaded filesystem access(by dd'ing from the raw drive to
/dev/null, while performing a filesystem backup). Both drives were
7200rpm, with UDMA enabled on the IDE drive. The SCSI drive was a 9GB
Quantum Atlas UW, which cost $370, and was attached to a Mylex BT950 UW
controller (~$250). The 6.5 GB Seagate Medalist PRO drive cost $225.
My tests had the following results (in K/sec):
IDE SCSI
Raw Read: 13358 9423
Filsystem: 5174 4780
Loaded: 478 1511
As you can see, the first 2 cases the IDE drive won, but severly lost on
the 3rd.
Now, before I get flamed, I will admit that it is certainly possible to
put together a SCSI system that beats IDE for all cases. With unlimited
funds, ANYTHING is possible... :>
And for the 3rd case, my test is probably not really indicative of a
real-world situation. But it does show that at some level of high IO,
multi-user, multi-process environments, SCSI will have a clear ad
It would be very interesting to repeat the above with 2 UDMA drives
using an md/raid0 configuration.
-- Richard Fish Enhanced Software Technologies, Inc. Software Developer 4014 E Broadway Rd Suite 405 rjf@estinc.com Phoenix, AZ 85040 (602) 470-1115 http://www.estinc.com- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/