Trying to back up my system and failed(with smit)

  1. creating information file (/image.data) for rootvg ok!
  2. creating tape boot image
    bosboot : dd failed to copy /dev/rmt1.1.
    bosboot: WARNING! bosboot failed - do not attempt to boot device
    mksysb: Attempt to create a bootable tape failed:
    bosboot -d /dev/rmt1.1 -a failed with return code 48.

So, I have no idea of what is happen here, do anyone knows ? or anyone knows where I can find some information about it?

If you you are sure you really want to use /dev/rmt1, which is the second tape drive (the first one being /dev/rmt0) then i suppose this to be the problem: the digit behind the comma describes what capabilities the tape drive actually has. You might have (accidentally) told the tape drive not to have some of the necessary capabilities. Please provide the output of:

lsattr -El /dev/rmt1
lscfg -vpsl rmt1

bakunin