load-command with Dat-Exchanger

[Thomas Greig]

HP-UX 11i

we have a couple of hp DAT-exchangers, and I was wondering if there's a command I can type to insert/load the tape?

One can ofcourse do this manually, but I would like to be able to do it through the command-line too. sometimes the tape is not loaded, or say I need tape 6 and tape1 is loaded I will have to go through all the tapes before I get to the tape I need.

I'm sure there's a "quick" solution for this.



cheers
Thomas G.

[Thayanidhi]

Hi,

Use "mc" Command.

See the man page for "mc"

If you are using HP's Omniback,
then there are some sommand line utilitis.

TT

[Elmar P. Kolkman]

For this you will need a /dev entry for the changer. This device is something you will need to create yourself with mknod. On 11i it will be something like:
mknod /dev/datchgr c 203 0xcs0000
where:
c=controler number
s=SCSI ID of changer

If you have this, you can use:
mc -p /dev/datchgr [...]

[Thomas Greig]

I have already created "nod's" with the mknod-comamnd. the address to that is
/dev/rmt/dat

¤ll /dev/rmt/dat
crw-rw-rw- 1 bin bin 205 0x0030c0 ... /dev/rmt/dat


Even as I do it as root, I get a Permission-error when I try to run the mc-command:

#mc -p /dev/rmt/dat -r DS
ERROR: Permission denied

#mc -p /dev/rmt/dat -s S2 -d D1
ERROR: Permission denied

#mc -p /dev/rmt/dat -c DS
ERROR: Permission denied

Thom

[Elmar P. Kolkman · Accepted solution]

Your node is not for the changer but for a tape unit... You need the changer to have its own device node.

Check out the major number you used (205) with lsdev and you'll see it is using the stape driver instead of a spt or sctl driver, which is needed for the changer to work.

[Thomas Greig]

thank you very much!..this is now working perfect. the node for the exchanger was created for omniback.. but after creating a node for the tapedrive too it's working as a dream.

cheers
Thomas

[Thomas Greig]

one last question: is it possible to tell the 'mc' to return the tape from it's original slot?..

say we insert the third tape (out of six) into the drive, -when this tape is beeing ejected, we want it to return to slot 3.

If this is possible it's much easier to make a alias/script for this.

cheers
Thomas Greig