Specifications

Removal and replacement procedures 52
Flash-backed write cache procedures
Two types of procedures are provided for the FBWC option:
• Removal and replacement of failed components:
o Removing the cache module ("Flash-backed write cache module" on page 52)
o Removing the capacitor pack ("Flash-backed write cache capacitor pack" on page 53)
• Recovery of cached data from a failed server ("Recovering data from the flash-backed write cache" on
page 55)
CAUTION: Do not detach the cable that connects the battery pack or capacitor pack to the cache
module. Detaching the cable causes all data in the cache module to be lost.
Flash-backed write cache module
To remove the component:
CAUTION: The cache module connector does not use the industry-standard DDR3 mini-DIMMs.
Do not use the controller with cache modules designed for other controller models, because the
controller can malfunction and you can lose data. Also, do not transfer this cache module to an
unsupported controller model, because you can lose data.
1. Back up all data.
2. Close all applications.
3. Power down the server (on page 27).
4. Remove all power:
a. Disconnect each power cord from the power source.
b. Disconnect each power cord from the server.
CAUTION: In systems that use external data storage, be sure that the server is the first unit to be
powered down and the last to be powered back up. Taking this precaution ensures that the system
does not erroneously mark the drives as failed when the server is powered up.
5. Extend ("Extend the server from the rack" on page 28) or remove ("Remove the server from the rack" on
page 29) the server from the rack.
6. Remove the access panel ("Access panel" on page 33).
7. If it is populated with expansion boards, remove the PCIe riser cage for better access ("PCIe riser cage
(primary)" on page 36).
8. If the existing cache module is connected to a capacitor pack, observe the FBWC module LEDs:
o If the amber LED is flashing, data is trapped in the cache. Restore system power, and restart this
procedure from step 1.
o If the amber LED is not illuminated, remove the controller from the server, and then continue with the
next step.