> I would think that you could only run devices on the SCSI bus
> at one
> particular speed only. Typically a SCSI bus will run at the
I was afraid of that
> speed of the
> lowest device (ie: if you put a 10MB/sec CDROM on an 80MB/sec
I was afraid of that too :-(
> would think
> that the driver would be smart enough to know about the
> devices and adjust
> accordingly. If I set my driver to 40, it always adjusts down
unfortunately it is not! That is the issue here. My scsi
scanner was fine at 20MB/sec and probably could have gone
faster, however my scsi cd-rw tried to run at 10MB/sec and
errored out and would not finish burning cdroms (cdrecord -dummy
and actually tried burning one and it failed miserably). I have
changed the setting in the kernel to 5MB/sec and now the cd-rw
burns fine, although it takes 15 minutes or so to burn 650 MB.
Also becuase of this change my scanner takes longer. I am afraid
of how long it will take to scan images at 900dpi with this
change.
AFAIK the cable is a standard grey cable with 1 red line.
The cd-rw is device 5 on the scsi bus and the scanner is device
6.
The cd-rw is the terminating device.
> over the bus. 5 seems like an awfully slow rate for any
> device, so I would
> check your setup to make sure everything is in tip-top shape.
My hard drives are EIDE on a PCI interface, how do I find out if
they are causing the scsi timeout that I get at speeds higher
than 5MB/sec?
How can I make the driver smart enough so that when it sees my
hp 9210i cd-rw it sets the speed at 5MB/sec, but when it sees my
scanner it negotiates at 20MB/sec?
What I don't understand is that the cd-rw seems to work fine for
about 10 to 20 Meg at 10MB/sec but after that it errors out.
Something I should mention is that I am using the ncr53c8xx as a
module and also the sr_mod as a module for the cd-rw. Also the
scanner and cd-rw do not have to be working at the same time.
(I am never going to try to scan-to-burn).
The scanner is not always on.
Any suggestion of what I should be looking for? What affects the
speed of my scsi bus and cd writing?
Joe
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This archive was generated by hypermail 2b29 : Sun Apr 23 2000 - 21:00:19 EST