Problems with HP C1533A DAT on SS10/41 with Solaris 2.2

Hi managers,

This was my problem:

>>> We have a HPC 1533A 4mm DAT tape connected to a SPARC 10/41 running

>>> Solaris 2.2.

>>> On the SCSI port there are usually one internal disk, two external disks,

>>> external CDROM and external exabyte (active terminated). For this test I

>>> replaced the CDROM and the exabyte with the DAT tape drive

>>>

>>> The drive can be detected by the probe-scsi command.

>>>

>>> If i try to do a

>>>

>>> mt -f /dev/rmt/0c status

>>>

>>> the system hangs until i type '^Z' and '^C' sometimes and push the

>>> eject button on the tape drive.

>>> Then the drive starts working and the machine continues to work.

>>>

>>> Even the reconfiguration boot seems to take much more time than without

>>> this tape drive.

>>>

>>> Sounds somewhat mysterious, didn't it ?

>>>

>>> Do I have to make some special entries in /kernel/drv/st.conf ?

>>>

>>> The drive works without any problems on a machine with SunOS 4.1.x .

The solution to the problem is a patch to the st-driver in /kernel/drv/st .

It hacks /kernel/drv/st to kid the kernel into recognising the HP as a

Sun (Archive Phython) DAT.

Now the tape runs fine with expected transfer rate (about 1MB/sec).

But the time for reconfiguration is about twice the time as with an

Exabyte 8200. I don't know why but I seldom use to reconfigure the

machine so thats not really a problem.

Thanks to:

"Marc K. Newman" <unido!pavlov.ssctr.bcm.tmc.edu!mknewman>

[2932 byte] By [CodeProf.com] at [2007-12-25 8:41:00]

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