IBM MTM 2145-12F, Hardware Installation Manual

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the cover off an operational enclosure for more than 15 minutes. The reduction in
airflow through the enclosure might cause the enclosure or its components to shut
down to protect from overheating.
About this task
The 2145-92F expansion enclosure contains two secondary expander modules, as
Figure 83 shows. The secondary expander modules provide SAS connectivity
between the expansion canisters and the drives. Each drive has 2 SAS ports. SAS
port 1 of each drive is connected to secondary expander module 1. SAS port 2 of
each drive is connected to secondary expander module 2. Each expansion canister
is connected to both secondary expander module 1 and secondary expander
module 2. If secondary expander module 2 is missing or is faulty, the expansion
canisters can communicate only with SAS port 1 on each drive. Similarly, if
secondary expander module 1 is missing or is faulty, the expansion canisters can
communicate only with SAS port 2 on each drive.
This task assumes that the following conditions were met:
v The top cover was removed, as described in “Removing the top cover: 2145-92F”
on page 56.
v
The secondary expansion module was removed, as described in “Removing a
secondary expander module: 2145-92F” on page 117.
Procedure
1. Slide the expansion enclosure out from the rack, as described in “Removing
an expansion enclosure from a rack: 2145-92F” on page 104.
2. Identify the secondary expander module to be replaced; Figure 84 on page 88
shows the LEDs on top of a secondary expansion module.
svc01013
Figure 83. Location of secondary expander modules
Chapter 4. Installing an optional 5U SAS expansion enclosure
87