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26 HP MSA 500 G2 Storage System Maintenance and Service Guide
If 60 seconds elapse with no user input, one of the following actions occurs:
• In a non-hot-plug environment, the controller with the most recent firmware
disables the controller with the older firmware and continues the power-up
sequence. This method prevents automatic loss of a previous version of
firmware.
• In a hot-plug environment, cloning begins automatically, and the storage
system overwrites one firmware version with the other version.
When the cloning is complete, the storage system resets the modified controller.
After the modified controller powers up, the controllers begin operating in
redundant mode.
The storage system clones firmware based on the following criteria:
• Non-Hot-Plug Cloning—If the storage system powers up with both
controllers installed, the storage system clones the most recent firmware
version from either controller.
• Hot-Plug Cloning—If the storage system is operating and an optional
redundant controller is installed, the storage system clones the firmware
version from the primary controller, regardless of which firmware version is
more recent. This cloning method ensures that all host-initiated I/O remains
uninterrupted during storage system operation.
• Incompatible Version Cloning—If a specific version of firmware is
incompatible with certain hardware revisions of a controller, the storage
system displays the user input message seeking to initiate Controller
Firmware Auto Cloning and clones the most recent firmware version that is
compatible with both controllers.
IMPORTANT: During incompatible version cloning, the storage system
does not reset the updated controller if the controller is operating and
processing I/O. In this case, the storage system does not enter
redundant mode and provides an informational message on the
controller display. To configure redundancy, cycle the storage system
power.
Array Configuration Utility
ACU is a browser-based utility with the following features: