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Note: Make sure that captive screws securing fan assemblies to chassis are tightened. If not, high
pressure from fan operation may unseat fan from chassis connectors.
Fan assembly fault indicators
Use one of the following methods to determine if a fan assembly is faulty:
v Check the fan status LED.
– Steady amber - fan assembly has a failure (full or partial).
– Slow-flashing amber (on 2 seconds, then off 2 seconds) - fan assembly is not seated correctly or is
faulty.
– Fast-flashing amber (on ½ second, then off ½ second) - environmental range exceeded.
v Enter fanShow. If status of fan assembly displays absent or faulty, check if assembly is seated in chassis.
If it is, power supply could be faulty or is not receiving power for some reason.
v Enter sensorShow to determine if a fan is running above average temperatures of other installed fan(s).
v Enter errDump to display the system error log.
For more information on LED operation, refer to"Interpreting fan assembly LEDs" on page 95.
For output examples and additional information on Fabric OS commands, refer to"Using monitoring
commands" on page 97 and theFabric OS Command Reference.
For more information about error messages, refer to theFabric OS Message Reference.
Fan assembly task guide
This section contains a guide to more complete, detailed steps in this section for installing or replacing
fan assemblies when the device is running (hot swap) or must be powered off (cold swap). References are
provided to the more detailed removal and installation steps for further information.
Note: Each fan assembly contains 2 fans for a total of 4 fans for two installed fan assemblies. The device
requires 3 fans out of 4 functioning fans for operation. If hot-swapping a fan assembly, be sure to have
the replacement fan assembly ready to install before removing a faulty fan assembly and replace as soon
as possible.
Note: If a fan assembly has failed, do not remove it from chassis unless a FRU is available for
replacement. If the slot is left empty for an extended time period, this could cause chassis air-leakage and
overheating.
Note: Make sure that captive screws securing fan assemblies to chassis are tightened. If not, high
pressure from fan operation may unseat fan from chassis connectors.
Replacing fan assembly (hot-swap)
If your device is up and running, but a fan assembly has failed, complete the following steps.
1. Remove fan assembly.
2. Insert new fan assembly into empty slot as soon as possible.
3. Verify that the fan assembly status LED is green.
Replacing fan assembly (cold-swap)
If your device is up and running, but you want to power down the device to replace a failed fan
assembly, complete the following steps.
1. Shut down the system using the sysShutdown command.
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SAN256B-6 Installation, Service, and User Guide
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