Denny Page wrote:
The problem has to do with the speed negotiation that occurs on driver
initialization.
That I know of, there are 2 ways to address the problem.
For kernel 2.6.17 (and later), you can go into the Adaptec scsi bios
and explicitly limit the transfer speed for the target device to 160 MB/s.
Alternatively, for kernel 2.6.16 (and later), you can add the following
to your boot init file:
# Fix scsi speed negotiation on tape drive
SYS_TAPE=/sys/class/spi_transport/target0:0:3
echo "12.5" > $SYS_TAPE/min_period
echo "1" > $SYS_TAPE/revalidate
[Remember to change the SYS_TAPE variable to match your target device]
You will know that you've done it correctly when you see 160MB/s as the
value of User/Goal/Curr for your target in /proc/scsi/aic79xx/*.
In my case, it's still unclear to me whether or not the problem is the
AIC79xx, the HP LTO drive, or the scsi driver.
I have successfully used your procedure in order to get an HP LTO-3
driver to work that's attached to an LSI/Fusion/MPT controller. That
would seem to point to the drive or the scsi driver rather than the
controller.
Alex
--
Alexander Jolk / BUF Compagnie
tel +33-1 42 68 18 28 / fax +33-1 42 68 18 29
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