Location Of Secondary Expander Modules - IBM J15 Manual

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:
• 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.
• 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.
• Do not remove a faulty secondary expander module until its replacement is ready to be installed.
• 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 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.
The two secondary expansion modules are already installed when the 5U expansion enclosure is shipped,
as Figure 84 on page 85 shows.
Figure 84. Location of secondary expander modules
Figure 85 on page 86 shows the location of the LED indicators on the top of the secondary expander
module. Each secondary expander module has its own set of LEDs. When power is connected to the
expansion enclosure, the LEDs identify the operational status of the secondary expander modules.
Chapter 3. Maintaining the system hardware 85