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Hardware options installation 84
Storage controller option
IMPORTANT: For additional installation and configuration information, refer to the
documentation that ships with the option.
To install the component:
1. Power down the server (on page 22).
2. Do one of the following:
o Open or remove the tower bezel, as needed ("Open or remove the tower bezel" on page 22).
o Extend the server from the rack (on page 24).
3. Remove the access panel (on page 25).
4. Remove fan 5 (on page 26).
5. If installed, remove the BBWC battery pack or the FBWC capacitor pack (on page 27).
6. Remove the air baffle (on page 28).
7. Install the storage controller ("Expansion board options" on page 78).
8. Connect the hot-plug SAS/SATA cable to the controller.
For connector locations, see the documentation that ships with the controller.
9. Install the air baffle.
10. If removed, install the BBWC battery pack or the FBWC capacitor pack ("Installing the BBWC battery
pack or the FBWC capacitor pack" on page 86).
11. Install fan 5.
12. Install the access panel.
13. Do one of the following:
o Close or install the tower bezel, as needed.
o Slide the server back into the rack.
14. Power up the server (on page 22, "Powering up and configuring the server" on page 40).
BBWC and FBWC options
The server supports either of the following:
• Battery-backed write cache (BBWC) options
BBWC consists of a cache module and a battery pack (also called a BBWC enabler). The DDR cache
module buffers and stores data being written by the controller. When the system is powered on, the
battery pack continuously recharges through a trickle-charging process lasting 15 minutes to 2 hours,
depending on the original charge. In the event of system power failure, a fully charged battery pack can
maintain the cached data for up to 72 hours.
• Flash-backed write cache (FBWC) options
FBWC consists of a cache module and a capacitor pack. The DDR cache module buffers and stores
data being written by the controller. When the system is powered on, the capacitor pack charges fully
in about 5 minutes. In the event of a system power failure, a fully charged capacitor pack provides
power for up to 80 seconds. During that interval, the controller transfers the cached data from DDR
memory to flash memory, where the data remains indefinitely or until a controller retrieves the data.