Using QuickBench, I'm comparing an ATA100 drive using a Sonnet Trio PCI
(IDE133) controller and a SCA SCSI drive using an ATTO PSC SCSI PCI
controller on a 50MHz bus computer, I find the ATA functions at 19-20
MB/sec and the SCSI at 22-23 MB/sec (Sequential R/W speeds).
Relative to the SCSI bus, this is better than the internal bus which
gave 9-10 MB/sec.
Is it the bus speed that is limiting the drive performance? The SCSI
controller card is capable of 40MB/sec.
Being completely honest, I'm using two computers: a 9500 and an 8500
with the following configurations:
PPC9500 Sonnet G3/500 10.3.9
A1 M-AUDIO 2496
B1
C1 FW400/USB1.1
D2 ATTO SCSI PSC: ST150176LC
E2
F2 ixmicro ultimateRez
TermOnly Int SCSI HD
PPC8500 Sonnet G4/450 10.3.9
A FW400/USB2/ATA133: ST380021A
B
C ATI Rad7KMacEd
Astra2400S
Just noticed my two cpu-s are a bit different: G4/450 and G3/500 ...
might that account for the difference with 19.5 and 22.5 average
speeds?
500/450 = 1.11 and 22.5/19.5 = 1.15
Mostly interested in why I'm not getting more from the ATTO controller
... say < = 40MB/sec?
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