Removing And Replacing Rear Fans (Blowers) - Silicon Graphics ICE X User Manual

7: Maintenance Procedures

Removing and Replacing Rear Fans (Blowers)

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The blade enclosure cooling fan assembly (blower enclosure) is positioned back-to-back with the
blade enclosure pair. You will need to access the rack from the back to remove and replace a fan.
The enclosure's system controller issues a warning message when a fan is not running properly.
This means the fan RPM level is not within tolerance. When a cooling fan fails, the following
things happen:
1. The system console will show a warning indicating the rack and enclosure position
001c01 L2> Fan (number) warning limit reached @ 0 RPM
2. A line will be added to the L1 system controller's log file indicating the fan warning.
The chassis management controller (CMC) monitors the temperature within each enclosure. If the
temperature increases due to a failed fan, the remaining fans will run at a higher RPM to
compensate for the missing fan. The system will continue running until a scheduled maintenance
occurs.
The fan numbers for the enclosure (as viewed from the rear) are shown in Figure 7-3 on page 99.
Note that under most circumstances a fan can be replaced while the system is operating. You will
need a #1 Phillips-head screw driver to complete the procedure.
007-5806-004