Is this an internal or external tape drive? If external, is it cabled to
the server and plugged in with the same scsi id as prior to the update.
I would verify the above then rmdev -l rmt0 -d
lsdev -Cc tape (should be no tape drives)
cfgmgr
If tape drive is good, you will get rmt0 back, if not, call hardware support
and have a CE come out and replace the tape drive or scsi card.
Doug

"Alona" <allab@sympatico.ca> wrote in message
news:93d97bd1.0411101521.1be892e5@posting.google.c om...
> Hello All,
>
> I was able to succesfully backup bare AIX5.2 (no ML installed) with
> mksysb -i -vmX /dev/rmt0 command.
>
>
> After system upgrade to ML4 an attemt to create a bootable bakup
> resulted in the following message:
>
> # lsdev -Cc tape
> rmt0 Available 10-89-00-0,0 Other SCSI Tape Drive
> # mksysb -i -m -v -X /dev/rmt0
>
> Creating information file (/image.data) for rootvg..
>
> Creating tape boot
image............................................. ......
> bosboot: Boot image is 25356 512 byte blocks.
>
> ***** ATTENTION *****
> The boot image you just created might fail to boot because
> the size exceeds the system limit. For information about
> fixes or workarounds, see /usr/lpp/bos.sysmgt/README.
> ***** ATTENTION *****
>
> 0301-161 bosboot: dd failed to copy /dev/rmt0.1.
>
> 0301-165 bosboot: WARNING! bosboot failed - do not attempt to boot
> device.
>
> 0512-016 mksysb: Attempt to create a bootable tape failed:
> bosboot -d /dev/rmt0.1 -a failed with return code 48.
>
>
> # mt -f /dev/rmt0 rewind
> /dev/rmt0: There is a request to a device or address that does not
> exist.
> You have mail in /usr/spool/mail/root
> # lsdev -Cc tape
> rmt0 Defined 10-89-00-0,0 Other SCSI Tape Drive
> # mgrcfg
> # lsdev -Cc tape
> rmt0 Defined 10-89-00-0,0 Other SCSI Tape Drive
> # cfgmgr -i /dev/rmt0
> cannot open /dev/rmt0: No such device or address
> Please mount volume 1 on /dev/rmt0
> ...and press Enter to continue installp: The specified device
> /dev/rmt0
> is not a valid device or file.
> # lsdev -Cc tape
> rmt0 Defined 10-89-00-0,0 Other SCSI Tape Drive
>
> Does anyone has an idea of what is going on and what should be done to
> make /dev/rmt0 available? Why whould bootable image exceed system
> limit?
>
>
> Thank you,
> Alona