Silicon Graphics TP9400 RAID Owner's Manual page 39

Diagnostic Interface Connectors
007-4304-003
You can hot swap the fan/communications canister, replacing it while the controller
enclosure is in operation, as long as you complete the exchange within 15 minutes from
the time you remove the failed unit until you seat the new one.
It is unlikely that both fans in the fan/communications canister would fail
simultaneously. Such a failure would cause one or both power supplies to overheat. In
these circumstances, the amber Power Supply Fault indicator on the front cover turns on
and the overheated power supply automatically shuts down (its green Power Supply
indicator turns off). Once the ambient air temperature cools below 70º C (158º F), the
power supply automatically turns on. Replace the failed fan/communications canister,
then check the indicators (Power Supply Fault indicator on the front and Power Supply
indicator at the rear). If the Power Supply Fault indicator remains on, replace the power
supply. For more information about indicators, see "Checking the Controller Enclosure
Indicator Lights" on page 36.
If you replace the fan/communications canister and continue to experience problems,
the controller enclosure may have defective components or connections. Check the
storage management software (TPSSM7) for indications of other component failures.
The fan/communications canister has two Ethernet (RJ-45) connectors, one for
Controller A and one for Controller B (Figure 2-11). The Ethernet connectors are used to
manage the storage arrays directly from a remote management station. The canister also
has two serial (RS-232) connectors, one for Controller A and one for Controller B. These
connectors are used to diagnose problems, using storage management software
(TPSSM7) or other diagnostic tools. (The RS-232 connector is primarily intended for use
by SGI field personnel.)
Controller Enclosure Components
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