tape devices

[trystan macdonald]

Hi,
I have re-installed HP-UX 10.20 on one of our servers. I have found that the previous tape device /dev/rmt/0m is unavailable and to access this we now have to use /dev/rmt/01, previous /dev/rmt/01 is now /dev/rmt/02 etc...

Is there a simple way to re-align these tape devices?

Thanks in advance,

Trystan.

[Pete Randall · Accepted solution]

Trystan,

You can make the device files:

1. Use "ioscan" to find out what the current device files look like and what the instance number is:

ioscan -kfnCtape


2. Use "mksf" to create each of the four types of device files:

/sbin/mksf -d stape -I 12 -a -b BEST rmt/12m
/sbin/mksf -d stape -I 12 -u -b BEST rmt/12mb
/sbin/mksf -d stape -I 12 -a -n -b BEST rmt/12mn
/sbin/mksf -d stape -I 12 -u -n -b BEST rmt/12mnb


3. Use "ll" to compare your newly created device files with those created by the system. Major and minor numbers should match between corresponding entries (205 0x061000 for both 12m and the equivalent c6t1d0BEST):

ll /dev/rmt |more

crw-rw-rw 1 bin bin 205 0x061000 Mar 17 08:40 12m
.
.
.
crw-rw-rw 1 bin bin 205 0x061000 Mar 17 08:40 c6t1d0BEST
.
.
.



4. repeat the ioscan to double check that your new device files are associated with the correct tape drive:

ioscan -kfnCtape



I was using 12m in the example but you can use anything you want.

Pete

[Jean-Louis Phelix]

Hi,

By default, number after rmt is simply the instance number that you get in ioscan. So deleting and recreating devices will not work if instances keep the same.

So you can try to rename the 1m, 1mn, 1mb and 1mnb files to 0m, ... (don't need to change the cxtydzzz files), on remap your instances, use rmsf in /dev/rmt and finally insf -e.

Remapping tape instances is quite simple but you need a reboot :

0 - use man ioinit ...
1 - run ioscan -kfnCtape
2 - from previous output create a file containing lines like :
hw_path tape 0
hw_path tape 1
hw_path tape 2
...
these lines should reflect the numbers you want
3 - run ioinit -f file (check error messages !)
4 - reboot ...
5 - rmsf /dev/rmt/*
6 - insf -e

Regards

[Armin Feller]

Hi,

try this:

# rmsf -H
# insf -H
# ioscan -fnCtape

Regards,
Armin