On Nov 2, 2004, at 8:48 PM, Stewart, Brian C wrote:
Back to the ATTO SCSI controller Issue...
PERFORMANCE!!! My B&W has an IDE ATA DMA33 controller and a Maxtor FireBall
30 Gig drive (ATA133, 5,400rpm, 512K cache). The IDE drive gets better
benchmark scores then the SCSI drive under Mac OS X. Both drives show an
unimpressive 10 MB/sec maximum transfer rate (sequential read test 1024k)
under Mac OS X. This is understandable for the IDE drive but NOT MY BRAND
NEW ATTO ULTRA SCSI/10,000RPM DRIVE COMBO!!!
The kick in the head is...
Mac OS 9.2.2 Benchmark tests show the drive performing at 60 MB/sec and the
IDE drive at 28 MB/sec. Both are totally expected results
What OS X Benchmark program are you using? What version?
Is you OSX testing using sequential or random reads and writes? On a WD 120G ata drive on the native ATA66 bus, I get 45 to 55MB/sec transfers sequential and 1.32 to 27.19MB/sec transfers on the random test of xBench 1.3
Len
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