ServerNet/FX Adapter Configuration and Management Manual

Managing the ServerNet/FX Adapter Subsystem
ServerNet/FX Adapter Configuration and Management Manual—426872-002
3-11
Stopping an LBU
Using SCF Commands for the ServerNet/FX Adapter
Subsystem
The ServerNet/FX adapter subsystem SCF STOP LBU command stops the flow of
messages from the FOX ring through a specified LBU. Successful completion of the
command leaves the specified LBU is the STOPPED state.
To stop an LBU at a selected cluster, the corresponding LBUs at the cluster’s cable
neighbors should first be disconnected from the target LBU using the SCF
DISCONNECT command before issuing the SCF STOP LBU command for the target
LBU.
Perform the following tasks to stop an LBU:
Task 1: Notify users
If you plan to stop both LBUs on a cluster, notify the users of the FOX ring warning
them that you are bringing down a cluster. Allow them time to finish communicating
with the cluster before it is brought down.
This task is not necessary if you are stopping only one LBU, however. Stopping one
LBU is a nondisruptive operation as long as the other LBU remains operational; the
stopped LBU stops the flow of messages from the FOX ring.
Task 2: Disconnect the corresponding LBUs at the cable neighbors
Before you can stop an LBU at a selected cluster, you should first disconnect the
corresponding LBUs at the cluster’s cable neighbors. The SCF DISCONNECT
command logically disconnects the LBU from the FOX ring by stopping messages from
flowing in and out of the left or right side of the specified ServerNet/FX adapter.
For example, to disconnect the LBU for the ServerNet/FX adapter connected to the
Y-ring at the local cluster, your would use the following SCF commands at the cluster’s
cable neighbors:
At the left cable neighbor:
If the left cable neighbor is running the D-series NonStop Kernel operating system,
enter the following SCF command:
SCF> DISCONNECT LBU $IPB.#Y,RIGHT
If the left cable neighbor is running the G-series NonStop Kernel operating system,
enter the following SCF command:
SCF> DISCONNECT LBU $ZZFOX.#Y,RIGHT