Silicon Graphics InfiniteStorage 4000 Series System Upgrade Manual page 56

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ATTENTION Possible data loss or corruption – Wait for the blue Controller
Service Action Allowed LED on controller A to come on before you turn off the power
to either controller; otherwise, possible data loss or corruption might occur.
Figure 33 Controller LEDs
7. Turn off the Power switch on each of the power-fan canisters, and wait until all
LED and seven-segment display activity on the rear of the controller-drive tray
has stopped.
Figure 34 Power Switches on the E5460 Controller-Drive Tray
8. Disconnect the following cables from both controller canisters.
Host interface cables
—
Drive interface cables
—
Ethernet cables
—
If fiber-optic cables are present, you can lift the two release levers and partially
remove the controller canister. Opening these release levers makes it easier to
press down on the fiber-optic cable release tab.
1. Controller Service Action Allowed LED (Blue)
2. Controller Service Action Required LED (Amber)
1. Power Switch for Controller A
2. Power Switch for Controller B