Technical data

Chapter 2: Upgrading Trays in the Storage Array 19
3. Remove the cache backup memory device from the connector on the controller
card.
a. Gently pull back on the latch that secures one edge of the cache backup
memory device to the connector on the controller card.
b. Lift the cache backup memory device from the connector.
4. Install the new cache backup memory device.
a. Carefully align the cache backup memory device with the connector on the
controller card so that the pins do not bend when you install the cache
backup memory device.
b. Install the cache backup memory device into an empty socket location by
gently pressing down on the cache backup memory device until it snaps into
place.
5. Repeat this procedure for the other controller canister.
6. Go to "Reinstalling the Controller Canister in the CE7900 Controller Tray" on
page 19.
Reinstalling the
Controller Canister in
the CE7900 Controller
Tray
1. Reinstall the top covers on both controller canisters, and tighten all of the
thumbscrews that secure the top cover.
2. Slide both controller canisters all of the way into the controller tray. Rotate the
release handles in to lock each controller canister into place.
3. Reconnect all of the following cables to the appropriate ports on both controller
canisters.
— Ethernet cables
— Host interface cables
— Drive interface cables
4. Plug in the power cords to both of the controller canisters.
5. Turn on the Power switches on both of the controller canisters.
Controller B comes up in Write-Through mode. Controller A comes up in an
Offline state.
6. Bring controller A online. In the Array Management Window, right-click the
controller, and then select Advanced >> Place >> Online, or use the following
CLI command.
set controller [a] availability=online;
7. Look at the LEDs on the controller canister to make sure that the controllers are
rebooting correctly. Refer to the following figure for the locations of the LEDs.