Hi Sendura,
You probably already did this...but...in Robtest did you issue the command to "allow removal" of tapes from drives before attempting the unload?

(Error - cannot open /dev/rmt/8cbn (I/O error))

Sendura,
It sounds like you may have a tape stuck in a drive or a drive that has an error status on it.
Have you tried physically resetting the drive?

What kind of tape library are you using?

Sometimes resetting the drive in the admin console then bring the drive up will work to get a tape out of a drive although I have had tapes so stuck that the drive had to be replaced

>unload d2
>Opening /dev/rmt/8cbn, please wait...
>Error - cannot open /dev/rmt/8cbn (I/O error)

you have to unload the media before you can move it.
you were not successfull in removing the tape.
Check the drive mappings for that physical drive to 8cbn
check the status with the mt command

You may need to open the library and push the unload button.
I had several DLT tape drives that had a broken leader.
They all started to break after about 3 years of service.
I had StorageTek come in and eject the tape for me.
and replace the leader or tape drive.

Hi,

How to check the status of the drives using mt commands?

mt -f status

example (with tape mounted):

# mt -f /dev/rmt/c24t0d0BESTnb status
Drive: HP Ultrium 2-SCSI
Format:
Status: BOT online compression immediate-report-mode
File: 0
Block: 0

Hi Sendura,

Reading thru' your post again I suspect even if mt status command works fine, it may not means that your drive is working. You can also do a mt -f release, rewind or offline. If it doesn't help, I would suggest:
1. from the tape library (e.g. operator panel, etc), check whether tape is loaded,
2. if tape is found, reset your tape drive from tape library & vmoprcmd -reset and do a inventory from Netbackup,
3. if problem still persists, wait till no backup activities and initialise your tape library (e.g. open & close your tape library, take this opportunity to remove the tape from drive if possible) and perform inventory. Get your library vendor in if tape is stuck in the drive.

Hi chia,

The command "vmoprcmd -reset " will corrupt the drive(device) driver(software? Needs to reinstall the device driver for that drive?

Thanks

It shouldn't. What it do is sent a soft reset to the drive and under normal circustances, netbackup would initiate the robotic control to pickup the ejected media, if any, and place back to the slot.