Error Message:

# varyonvg testvg
0516-082 varyonvg: Unable to access a special device file.

Execute redefinevg and synclvodm to build correct environment.

Solution:

# redefinevg -d hdiskX testvg
# varyonvg testvg
# synclvodm testvg

Note:

If testvg contains more than one disk then redefinedvg should run against all disk which is part of testvg