Silicon Graphics InfiniteStorage 4000 Series System Upgrade Manual page 92

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ATTENTION Potential loss of connectivity – If both controllers in a duplex
controller-drive tray are powered up at the same time with different types of HICs, a
mismatch results that causes both controllers to lock down (shut down and stop
operating). If one controller is already running, and you replace the alternate controller
with a controller that has a different HIC, only the replacement controller locks down,
and the running controller remains operational.
Before you upgrade an HIC, gather antistatic protection, a new HIC, and the
controller air blocker. If you are changing your current configuration, you might need
to replace these items in addition to the HIC:
Small Form-factor Pluggable (SFP) transceivers.
Host bus adapters or host channel adapters.
Cables – InfiniBand uses copper cable, and Fibre Channel uses copper cable or
fiber-optic cable.
The correct HIC subplate for the front of the controller.
ATTENTION Possible hardware damage – If you perform this procedure with the
power turned on, the equipment might overheat if the controller slot is left open for
more than three minutes. To prevent the possibility of overheating, you must insert the
controller air blocker into the controller slot when servicing the controller.