Lenovo ThinkSystem DE Series Manual page 131

◦ From ThinkSystem System Manager:
i. Select Hardware.
ii. If the graphic shows the drives, select Show back of shelf.
iii. Select the controller you want to place online.
iv. Select Place Online from the context menu, and confirm that you want to perform the
operation.
The system places the controller online. * Alternatively, you can use the following CLI
commands:
For controller A:
For controller B:
Notes:
▪ Execution environment requires setting JAVA_HOME environment variable, and
JRE8 or later.
▪ See Command Line Interface (CLI) Reference
syntax for this operation.
3. Check the codes on the controller's seven-segment display as it comes back online. If the
display shows one of the following repeating sequences, immediately remove the controller.
◦ OE, L0, blank (mismatched controllers)
◦ OE, L6, blank (unsupported HIC)
Possible loss of data access — If the controller you just installed shows

one of these codes, and the other controller is reset for any reason, the
second controller could also lock down.
4. When the controller is back online, confirm that its status is Optimal, and check the controller
shelf's Attention LEDs.
If the status is not Optimal or if any of the Attention LEDs are on, confirm that all cables are
correctly seated, and check that the HIC and the controller canister are installed correctly. If
necessary, remove and reinstall the controller canister and the HIC.

If you cannot resolve the problem, contact technical support.
5. Collect support data for your storage array using ThinkSystem System Manager.
a. Select Support › Support Center › Diagnostics.
b. Select Collect Support Data.
c. Click Collect.
The file is saved in the Downloads folder for your browser with the name, support-data.7z.
6. Return the failed part to Lenovo, by following all packaging instructions and using any
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set controller [a] availability=online;
set controller [b] availability=online;
and follow the complete command