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Autochanger with C1537A and Omniback : cannot open exchanger control device

Mauro Cimino_2
Frequent Advisor

Autochanger with C1537A and Omniback : cannot open exchanger control device

I have installed a C1537 Autoexchanger DDS on my system (HP-UX 11.11). It seem work by command line with the mc command , but I get the error in Subject when I use it on Omniback II 3.00. It' spossible that I havn't installed it properly? The resutl of ioscan is :

tape 1 8/16/6.5.3 stape CLAIMED DEVICE HP C1537A
/dev/rmt/1m ......

and I have done teh special file with:
mknod /dev/rmt/0m 203 0x0130000.
In the kernel there are the sctl, autox0 and schgr drive. Anybody can help me?
6 REPLIES
Leif Halvarsson_2
Honored Contributor

Re: Autochanger with C1537A and Omniback : cannot open exchanger control device

Hi,
Is it correct you are using OmniBack 3.0 . It has been out of support for some time now. I can't find information but it is perhaps not supported on HP-UX 11.11. You can test with the "uma" command (/opt/lbin/uma). It is similar to "mc" but a OmniBack utility. If you get problem with this too I think you need to upgrade OmniBack. As the "mc" command works your drivers seems OK. Have a look at man pages for uma.
Ashwani Kashyap
Honored Contributor

Re: Autochanger with C1537A and Omniback : cannot open exchanger control device

You may try this .

Delete your special file and recreate it wiht major number 231 , the major number for schgr driver .
Gerrit Beyken
Respected Contributor

Re: Autochanger with C1537A and Omniback : cannot open exchanger control device

Hi,

you have created you exchanger control devicefile with the wrong minor number (i think this is the minornumber of your tape).
You should do this:
- delete your created specialfile /dev/rmt/1m
- "ioscan -fnkC autoch" which will give you path to your exchanger control device
- "ll" the devicefile of your exchanger control devicefile /dev/rac/... to get the right minor number
- "lsdev -d sctl" to get the major number of the sctl driver
- mknod /dev/rmt/robot c
- check the devicefile by using the "uma" of Omniback "/opt/omni/lbin/uma -ioctl /dev/rmt/robot"; then you will get a prompt where you can do a e.g. "stat S" to get the status of your slots
- now modify your Omniback Library config accordingly

regards

Gerrit
Leif Halvarsson_2
Honored Contributor

Re: Autochanger with C1537A and Omniback : cannot open exchanger control device

Hi,
203 is the correct minor number if HP-UX 11.11, perhaps it is different in previous versions. I use this driver for our library and it works without problem.
Mauro Cimino_2
Frequent Advisor

Re: Autochanger with C1537A and Omniback : cannot open exchanger control device

Sorry , but I havn't any autoch in output of my ioscan.
And ( for Ashwani) why I have to try 231 for Major Number? From where do you get this number?
Also , If I try uma utility I get the same error:
Cannot open exchanger control device ( not a scsi II Exchanger)
Mauro Cimino_2
Frequent Advisor

Re: Autochanger with C1537A and Omniback : cannot open exchanger control device

OK!!
I have remade the special file with

mknod /dev/rmt/0pick 203 0x013100

and now it seems to be working.
Thanks to all you for the answers, Mauro