VxUpdate replaces update_clients script in NetBackup 8.1.2
The update_clients script is deprecated in NetBackup 8.1.2. You can continue to upgrade clients to NetBackup 8.1.2 using this script. You may not, however, use the script for upgrades to any releases that follow NetBackup 8.1.2. Use VxUpdate to perform this function at NetBackup 8.1.2 and beyond. More information is available.
See About VxUpdate.