Chapter 4. FRU replacement
Attention: Read “Safety notices and labels” on page xiii before removing or
installing any components.
The field replaceable units (FRUs) in the SAN24B-5 can be removed and replaced
without special tools. The switch can continue operating during many of the FRU
replacements if the conditions specified in the procedure are followed.
Replacing a power supply and fan assembly
The SAN24B-5 fans are fixed inside the combined power supply and fan FRU to
provide necessary airflow to cool the whole system. There are two fans located in
each FRU. The system software sets fan speed and measures their speeds through
the tachometer interface.
The base model switch has a single power supply and fan assembly. A second
power supply and fan assembly is an optional feature for redundancy. The power
supply and fan assembly FRU units are hot-swappable only if replaced one at a
time and two are installed. They are identical and fit into either slot. Fabric OS
identifies the assemblies from right to left on the nonport side. Even though they
are contained within a single unit, the power supply and fan components are
identified separately. In the chassisShow command they are identified as Power
Supply Unit:1 and Fan Unit:1.
The SAN24B-5 base model has one power supply and fan assembly, as shown in
Figure 13. If installed, power supply unit 2 would be located where the filler panel
1 is shown.
1 Filler panel 5 Power plug receptacle (with plug
retainer)
2 Power supply and fan assembly 1 6 Thumbscrew
3 Power supply and fan assembly LED 7 Handle
4 On/off switch
1 2 3
7
6
4 5
b245005
Figure 13. Switch power supply and fan assembly components on the non-port side
© Copyright IBM Corp. 2012 33
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