Blowers Maintenance; Identify A Faulty Blower Assembly - Brocade Communications Systems SilkWorm 12000 Design, Deployment And Management Manual

7
Maintaining the SilkWorm 12000

Blowers Maintenance

There are three hot swappable blower assemblies and only two are required for cooling. Air enters from
the non-cable side of the chassis and exits at the top front of cable side. Three blower assemblies are
used in conjunction with a pressurized plenum to cool the unit. The SilkWorm 12000 hardware is
designed to withstand the loss of a single blower assembly and continue to run. Table 7-3 lists the
operational efficiency based on blower assembly availability. All slots must either have a 16-port card
installed or a filler panel installed for efficient cooling. Figure 7-5 shows the blower assemblies located
on the non-cable side of the switch.
Table 7-3
Blowers
3
2
1
Each blower assembly includes a blower card assembly, which provides the following features:
•
Blower status LEDs
•
Blower speed sensing
•
Blower speed control
•
Serial Electronically Erasable Programmable Read Only Memory (EEPROM) for blower assembly
part number, revision level, and error logs
Since the blower assemblies are located on the non-cable side of the switch, it is important to follow
proper installation and cabling procedures. There should be at least a two feet of gap in front of the
blower assembly for easy removal and install. Refer to the SilkWorm 12000 Hardware Reference
Manual for proper switch installation guidelines.

Identify A Faulty Blower Assembly

To determine if a blower assembly is marginal or faulty:
1. Check the LED status on the blower assembly. Refer to Table 7-4.
2. Check status using fanShow.
sw0_155:admin> fanshow
Fan #1 is absent
Fan #2 is OK, speed is 3013 RPM
Fan #3 is OK, speed is 3183 RPM
In the above example, blower assembly #1 is absent, meaning it has not been installed. If there is a
blower assembly that is not functioning then it is marked as faulty. There are status LEDs on the blower
assembly. A green LED indicates that power is good. An amber LED indicates that the blower assembly
needs attention. When there are less than three blower assemblies operating, the fan RPM increases to
compensate for the reduced airflow. The nominal RPM range is 2001-3400. Speeds above or below this
range result in a warning being issued.
7-10
Blower Availability
16-port card Power
down time
8 N/A
8 N/A
8 N/A
Operational Action
Level
100% None
100% Replace at next maintenance
Less than 100% Replace within 1 hour
Publication Number 53-0000251-02