Connectivity problems

This topic describes the issues with running GPFS commands on remote nodes due to connectivity problems.

Another reason why ssh may fail is that connectivity to a needed node has been lost. Error messages from mmdsh may indicate that connectivity to such a node has been lost. Here is an example:

mmdelnode -N k145n04
Verifying GPFS is stopped on all affected nodes ...
mmdsh: 6027-1617 There are no available nodes on which to run the command.
mmdelnode: 6027-1271 Unexpected error from verifyDaemonInactive: mmcommon onall.
  Return code: 1

If error messages indicate that connectivity to a node has been lost, use the ping command to verify whether the node can still be reached:

ping k145n04
PING k145n04: (119.114.68.69): 56 data bytes
<Ctrl- C>
----k145n04 PING Statistics----
3 packets transmitted, 0 packets received, 100% packet loss

If connectivity has been lost, restore it, then reissue the GPFS command.