topic instance number and device files in Operating System - HP-UX

instance number and device files

Nivesh Patnaik — Thu, 18 Dec 2003 12:53:41 GMT

I had two different types of tape devices
daisy chained.
The DLT was assigned instance 0 and the DAT was
assigned instance 1.
The DAT had a SCSI terminator.

I have finished working on the system, disconnected the DAT drive, terminated the DLT
and rebooted the system.
The DLT now shows up as instance 1, along with
/dev/rmt/1m, etc, but all my scripts use /dev/rmt/0m. Thats a huge problem.

What could be causing the instance number assignment to change?

I disconnected both the drives, powered down the
system and powered it back up. No tape drives were detected. I then connected the DLT (terminated) and did an ioscan. It still gets assigned instance 1.

Is this assignment being stored somewhere persistently?

Your help is needed most urgently.

Re: instance number and device files

JohnWRuffo — Thu, 18 Dec 2003 14:36:11 GMT

Connect the drive and terminate properly then you should go into /dev/rmt and rm * the devices
Then do a devlinks and tapes to get them back. Alternatively, you could rm * the directory and then do a b -r after a re-boot.

Hope this helps?
-John

Re: instance number and device files

Helen French — Thu, 18 Dec 2003 15:05:35 GMT

Check the minor numbers of the 0m and 1m device file and see if it's proper. If you want you can remove the special files with 'rmsf' command and then recreate it with:

# insf -e