On Sep 19, 9:06 pm, "prich...@blm.gov" wrote:
> I'm running AIX 5.3 TL5.
>
> If I try to change the block size on the SCSI tape drive with the
> command:
>
> chdev -l 'rmt0' -a block_size='0'
>
> I get the error:
>
> Method error (/etc/methods/chggen):
> 0514-038 Error loading kernel extension.
>
> And the tape drive goes from available to defined. Rebooted allows
> the tape drive to go back to available but I really need the block
> size to be zero.
>
> Any ideas?

Not really but
- Have check the errpt
- Is the tape device connect via san thus what kind of tape drive is
it
- Is the tape drive usable anyhow
- Since the drive is available after a reboot - does some program
( maybe from /etc/inittab ) does an unload of the kernel extension
...

cheers
Hajo

I solved it. The tape drive is on a scsi chain in a robot. Veritas
Netbackup had a scsi device called /dev/ovpass0. I removed /dev/
ovpass0 with the command /usr/openv/volmgr/bin/driver/remove_ovpass.
Set the block size. Then rebuilt /dev/ovpass0 using /usr/openv/volmgr/
bin/goodies/vmconf.

Sorry for the alarm. I've been messing with Netbackup and robots on
AIX for 10 years and I had not run into this before. Perhaps I never
wanted to reset the block size on the robots tape drive before.