Before you begin
DANGER
Hazardous voltage present. Voltages present constitute a shock hazard, which
can cause severe injury or death. (L004)
DANGER
Hazardous energy present. Voltages with hazardous energy might cause
heating when shorted with metal, which might result in splattered metal,
burns, or both. (L005)
CAUTION:
v Only an IBM Service Support Representative (SSR) can remove or replace the
secondary expander module from an enclosure (FRU P/N 01LJ112) that is
powered on. If the 01LJ112 enclosure is powered on, use caution and avoid
contact with the connectors on the main board.
v If the FRU part number of the enclosure is 01LJ607, you can remove or replace
the secondary expander module while the enclosure is powered on.
Important: You can remove a secondary expander module without powering off
the expansion enclosure. However, to maintain operating temperature, perform the
following tasks.
v Do not remove a faulty secondary expander module until its replacement is
ready to be installed.
v Do not keep 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 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
Chapter 2. Installing the system hardware 109
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