IBM N Series, Hardware Manual

Page: 165 / 368

Chapter 9. MetroCluster expansion cabling
145
c. Compare the firmware information in the command output with the disk shelf firmware
information at the N series support site to determine the most current disk shelf
firmware version.
4. The next step depends on how current the disk shelf firmware is:
– If the firmware version in the command output is the same as or later than the most
current version on the N series support site, no disk shelf firmware update is needed.
– If the firmware version in the command output is an earlier version than the most
current version on the N series support site, download and install the new disk shelf
firmware file. You can run the commands from either node.
5. Check the status of both nodes by entering the following command at the system console
of either node:
cf status
6. Take one of the following actions, depending on the result of the cf status command:
– If none of the nodes are in takeover mode, go to Step 7 in this procedure.
– If one of the nodes is in takeover mode, complete the following steps:
i. Correct the problem that caused the takeover.
ii. Enter the cf giveback command from the target node console.
iii. Return step 1 this procedure.
7. Disable controller failover by entering the following command from either node:
cf disable
8. If you ordered more HBAs, install them now; otherwise, go to the next step.
9. Enter the following command from the system console to perform a clean shutdown:
halt
10.Select one of the disk shelf stacks and remove the cabling by completing the following
steps (you can begin on any stack:
a. Remove the controller-to-bridge FC cables.
You are removing a total of four FC cables, two from each controller.
b. Remove the M1 port-to-bridge cable.
You are removing a total of two cables, one from each bridge to the network.
c. Remove the bridge-to-stack SAS copper cables.
You are removing a total of two SAS copper cables, one from the first shelf in the stack
and one from the last shelf in the stack.
d. If needed, you can remove the bridges from the rack.
11.Cable the controller-to-stack connections with SAS optical cables by completing the
following steps (use the cabling worksheet that you completed in Step 1 so you know
which SAS ports to use on the controllers):
a. Connect the first shelf in the stack to each controller.
b. Connect the last shelf in the stack to each controller.
The stack of disk shelves is now connected to both controllers with SAS optical cables.
12.Replace the stack shelf-to-shelf SAS copper cables with SAS optical cables.
13.Repeat Step 10 - 12 for each remaining stack, then proceed to the next step.
Note: Best practice is to remove the cables from the controller ports first.