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9. For the mini SAS signal cable attached to port 0-3 on the RAID controller, connect the other end to
the mini SAS signal cable connector 1 ( 2 ) on the backplane of your server. For the mini SAS signal
cable attached to port 4-7 on the RAID controller, connect the other end to the mini SAS signal cable
connector 2 (
1 ) on the backplane of your server.
Figure38. Backplane connector locations
1 Mini SAS signal connector 2
2 Mini SAS signal connector 1
Installing the ThinkServer 8708EM2 RAID Battery
This topic provides instructions on how to install the ThinkServer 8708EM2 RAID Battery (hereafter called the
battery card assembly).
Product description
The ThinkServer 8708EM2 SAS RAID Controller Battery protects the integrity of the cached data on the
8708EM2 SAS RAID controller by providing backup power up to 72 hours in case of a complete ac power
failure or a brief power outage. It has a built-in functionality to charge the battery pack automatically and to
communicate battery status information such as voltage, temperature, and current to your server. It also
provides an inexpensive alternative by using an uninterruptible power supply, and a second level of fault
tolerance when used in conjunction with an uninterruptible power supply.
CAUTION:
It is recommended that you replace the battery pack on the battery card assembly once a year or
after 500 recharging cycles, whichever comes rst.
Your option package contains the following:
• The ThinkServer 8708EM2 SAS RAID Controller Battery
• Three Phillips-head screws
• The user guide for the option
Chapter 5. Installing, removing, or replacing hardware 47