IBM N7800 Hardware And Service Manual page 131

Pre-replacement tasks for SAN configurations in an HA pair
If you have a SAN configuration and the motherboard trays are in an HA pair ,
you must save the FC port configuration information before replacing the
motherboard tray, so that you can reenter it on the new motherboard tray.
Procedure
1. If your system is in an HA pair , enter the following command from the
impaired node to save the FC port configuration information for the impaired
node (the system on which you are replacing the motherboard tray):
fcadmin config
2. Copy and save the screen display to a safe location for later reuse.
Shutting down a node operating in 7-Mode
When performing maintenance on a system operating in 7-Mode, you must shut
down the node. Depending on your system's configuration, you might also need to
turn off the power supplies.
Procedure
1. Either shut down or perform a takeover of the impaired node, depending on
your configuration:
If the system is in...
A stand-alone configuration and is running
A stand-alone configuration and is not
running
An HA pair
2. Check the status of the impaired node by entering the following command
from the healthy node's console:
cf status
3. Take one of the following actions, depending on the result of the cf status
command:
Status of the impaired node
It has been taken over by the healthy node
and is halted
It has been taken over by the healthy node
and is showing the Waiting for giveback...
message
It has taken over the healthy node
The impaired node has not been taken over
by the healthy node and is running
4. Wait at least two minutes after takeover of the impaired node to ensure that the
takeover completed successfully.
Then...
1. Enter the following command at the
console:
halt -t 0
2. Go to step 6.
Go to step 6.
Go to the next step.
Then
Go to step 5.
Go to the next step.
1. Resolve any issues on the healthy node
that lead to the takeover.
2. Give back the healthy node using the cf
giveback command from the impaired
node.
Enter the following command from the
healthy node's prompt:
cf takeover
Chapter 5. Replacing N7000 series system devices
105