Expand Configuration and Management Manual (G06.24+)

Troubleshooting
Expand Configuration and Management Manual—523347-008
21-36
Node Not Available
If the path displays a plus sign (+), you should first attempt to resolve the outstanding
request problem by issuing an Expand subsystem SCF ABORT PATH command to the
identified path and then issuing an Expand subsystem SCF START PATH command to
start it again.
If the path constantly displays the plus sign (+), this indicates that the connection
cannot be established. One solution to this problem is to abort all of the Expand paths
leaving the failing node, switch to the backup $NCP to reinitialize the node by using the
Expand subsystem SCF PRIMARY PROCESS command, and then restart all paths:
ABORT PATH $device_name1, $device_name2, ...
PRIMARY PROCESS $NCP, CPU cpu-number
START PATH $device_name1, $device_name2, ...
If the Expand subsystem SCF INFO PROCESS $NCP, NETMAP command does not
show a best-path route, use the Expand subsystem SCF PROBE PROCESS $NCP
command to probe shorter sections of the route to determine how far the probe
reaches. You must have a copy of the network map to perform this step.
A node can also be unreachable if it has been loaded with the same node number but
a different node name. In this case, the Expand subsystem SCF INFO PROCESS
$NCP, LINESET command would show the lineset as READY, but the node name
would not be displayed. The $NCP on the local node will not connect with the $NCP on
the remote node until the obsolete node name is removed from the network routing
table (NRT). Use the Expand subsystem SCF DELETE ENTRY $NCP command to
remove the obsolete node name from the NRT.
Path Down
A node may be unavailable because of a downed (nonoperational) path. You can
locate a downed path using the Expand subsystem SCF commands listed in
Table 21-17.
When you find a downed path, check for the following conditions:
•
Is this path/line always down?
•
Are there any configuration errors (especially event message 92 or 93)?
•
Is the cabling operational?
To gather further information about the path, ask the operator at the other end of the
path to use the Expand subsystem SCF INFO command to check the current line
attributes. When analyzing SCF INFO command information, verify the following line
attributes:
Table 21-17. SCF Commands to Locate a “Downed” Path
Expand Subsystem SCF Command Display Field What It Shows
INFO PROCESS $NCP, LINESET Status NOT READY (error_number)
STATUS PATH $device_name State STOPPED
STATUS LINE $device_name Status ERR (error_number)