topic Re: Can not rewind mt command in Operating System - HP-UX

Can not rewind mt command

Jesus_51 — Wed, 15 Feb 2012 18:00:29 GMT

Hi,

I have a MSL4048 LTO5 with HPUX 11.31. The MSL has two drives

tape      5 64000/0xfa00/0x18 estape   CLAIMED     DEVICE       HP      Ultrium 5-SCSI
                      /dev/rtape/tape5_BEST    /dev/rtape/tape5_BESTn
                      /dev/rtape/tape5_BESTb   /dev/rtape/tape5_BESTnb
tape      6 64000/0xfa00/0x1c estape   CLAIMED     DEVICE       HP      Ultrium 5-SCSI
                      /dev/rtape/tape6_BEST    /dev/rtape/tape6_BESTn
                      /dev/rtape/tape6_BESTb   /dev/rtape/tape6_BESTnb

and one autocharger

autoch 4 64000/0xfa00/0x1d eschgr CLAIMED DEVICE HP MSL G3 Series
/dev/rchgr/autoch4

This device is connected by SAN to SAN switch.

I can do backup and restore with data protector, and I can to load and unload tape with mc command. But I can not to rewind tape. I execute mt command with the tape loaded in drive:

# mt -f /dev/rtape/tape5_BESTnb rew

and I obtain the error:

/dev/rtape/tape5_BESTnb: No such device or address

Why ? If I can to use the device with Data Protector and I dont have any problem, and If I can load and unload tapes in drives, why I can not rewind the medium??

Operating System: HPUX 11.31

PHKL_36312 estape path.

Bundle 0803

Thanks,

Jesus

Re: Can not rewind mt command

Denver Osborn — Wed, 22 Feb 2012 03:43:18 GMT

Maybe you checked this, but I've gotta ask... of the two drives, you're using the drive which has the tape loaded?

Do you get the same result when running mt using tape6_BESTnb?

To see which tape drive is loaded, run the mt status command against both of your tape drives.

mt -f /dev/rtape/tape5_BESTnb stat

mt -f /dev/rtape/tape6_BESTnb stat

If no tape is loaded, I'd expect it to return "on tape open: no such device or address". The one with the tape loaded should return some info.

-denver

Re: Can not rewind mt command

Arockiasamy K — Fri, 24 Feb 2012 19:25:52 GMT

Please post the output of "ls -l /dev/rtape/".

If the device is not there, try to install the device file using "insf -e".

In DP, media agent maybe in some other server. Otherwise, the path for the drive might be some other name.

If it is not a critical one, remove the tape drive and re-install it by the below mentioned commands.

rmsf -a -H <H/W path>(not virtual one)

ioscan -fnC tape

*-don't remove 2 H/W paths at the same time, you may not know that which drive belongs to which special file.