Configuring HAU Default Mode

HAU default mode determines HAU behavior if a system boot mode is not set when configuring the system boot image. See Configuring System Boot Image and Mode for system boot mode details. There are three HAU default modes:

• never – A standard (non-high availability) upgrade is always performed unless over-ridden by the system boot mode high-availability setting
• if-possible – A high availability upgrade is always performed unless:
  • All HAU preconditions are not met, in which case a standard upgrade is performed
  • Over-ridden by the system boot mode standard or high-availability settings
• always – A high availability upgrade is always performed unless:
  • All HAU preconditions are not met, in which case no upgrade occurs
  • Over-ridden by the system boot mode standard setting

See High Availability Upgrade Preconditions for HAU precondition details.

Note

HAU default mode should always be set to never unless you intend to perform a high availability upgrade. An if-possible or always HAU default mode setting in conjunction with no system boot mode specified results in a high availability firmware upgrade each time you reboot your system, if all HAU preconditions are met.

If you want an HAU default mode change to affect a firmware upgrade, the change must take place before configuring a pending upgrade. Changing the HAU default mode after setting the system boot configuration (using the set boot system command) has no affect on a pending firmware upgrade.

Use the set boot high-availability default-mode command in any command mode to set the HAU default mode.