fsadm error V-3-20306: cannot lock
A stale lock file could be the cause
Check for the following file:
/lost+found/.fsadm
Check if fsadm is not stuck with:
ps -ef |grep fsadm
check thet .fsadm is not used by any process
fuser -fu/lost+found/.fsadm
Then remove the lock
rm -rf/lost+found/.fsadm
and run again vxresize.
Please note that this is the procedure in case of shrink.