Sounds a little slow, but not that far off, especially if it's a
7200RPM drive. Also keep in mind since you're copying between
partitions on the same drive, the 5MB/s you figured is actually closer
to 10MB/s (5MB/s read + 5MB/s write). Copying between a similar or
faster drive would boost the speed I'm sure.
I have a 4th generation Seagate Cheetah(10,000RPM) that I rarely got
20MB/s out of. Older drives also have a smaller cache built into them,
so that could slow things down. It is also possible the cable and/or
the 80pin to 68pin adapter is slowing things down some(unlike 68pin to
50pin, the 80pin has extra power lines and such to terminate and has
been known to cause issues in some cases).
The jumper configuration may be at fault too. Does the drive have a set
of jumper pins on the back *and* a set on the front? I temporarily
hosed the performance on a drive once when I put the configuration
jumpers on the set intended for SE(single-ended) use, instead of the
LVD set. What's the model number for the drive? Can look up the specs
and see what you should be getting out of it.
The 2940U2B itself shouldn't be causing problems. I've gotten some nice
performance out of it in the past.
- Alan
On Aug 16, 2005, at 8:20 PM, David Elmo wrote:
I am experimenting with an Adaptec 2940U2B SCSI card in a 7300 with a
405 MHz processor. I have an 18G IBM HD connected to it with an 80 to
68pin adaptor. The HD is partitioned into 2 vols. Copying from one to
the other is not so impressive, in fact, it does not seem any faster
than when the HD was on the normal internal O SCSI bus...
A zipped 70 MB file (Z-Mac OS 9.1 Update.smi) took 13 secs. This is
aprox 5MB a sec. A folder I have with lots of folders and stuff within
ran at about 1 MB a sec in copying from one vol to the other. If this
is the best I can get on this card, I am going to yank it out and use
the PCI slot for a more useful purpose (like putting my third screen
back on a video card). Yes, that is a threat, so there!
I was expecting to be impressed! Truth is, I was not that unhappy with
the speed of the internal SCSI 0 bus - slow but not like bus 1 (which
tries my patience for any external HD (but quite tolerable for zips,
scanner and burner))
This slow speed may be due to the cable which has an active termination
built in the end? Or something else to do with configuring jumpers or
the adaptor? It is the only device on the card and works fine in terms
of starting and use.
Do these figures surprise anyone (5 MB per sec at best)?
David Elmo
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