Backupios Fails with 0512-008 savevg

Problem(Abstract) Backupios command fails with 0512-008 savevg: The mkvgdata command failed. Backup canceled. Symptom $ backupios -file /home/padmin/mksysb/ibm74vioa_mksysb -mksysb /home/padmin/mksysb/ibm74vioa_mksysb doesn't exist. Creating /home/padmin/mksysb/ibm74vioa_mksysb Backup in progress. This command can take a considerable amount of time to complete, please be patient... Creating information file (/image.data) for rootvg. 0512-008 savevg: The mkvgdata command failed. Backup canceled. /usr/bin/mkvgdata[1068]: -: more tokens expected

Cause

This error is caused by having a user created filesystem mounted within rootvg.

Resolving the problem

Unmount all user-created filesystems in rootvg and re-run backupios command.