Diagnosis Guide

How to find the Group Leader (GL) node for a specific group

There are two ways of finding the Group Leader node of a specific group:

1. The hagsns command on the NS displays the list of membership for groups, including their Group Leader nodes. To use this method:
   1. Find the NS node from How to find the GS nameserver (NS) node.
   2. Issue the following command on the NS node:

      /usr/sbin/rsct/bin/hagsns -s hags
      

      The output is similar to:

      HA GS NameServer Status
      NodeId=6.14, pid=10094, domainId=6.14, NS established,
       CodeLevel=GSlevel(DRL=8)
      NS state=kBecomeNS, protocolInProgress=kNoProtocol,
        outstandingBroadcast=kNoBcast
      Process started on Jun 19 18:35:55, (10d 20:22:39) ago.
        HB connection took (0:0:0).
      Initial NS certainty on Jun 19 18:36:12, (10d 20:22:22) ago,
        taking (0:0:16).
      Our current epoch of certainty started on Jun 23 13:05:18,
        (7d 1:53:16) ago.
      Number of UP nodes: 12
      List of UP nodes:  0 1 5 6 7 8 9 11 17 19 23 26
      List of known groups:
      1.1 cssMembership: GL: 6 seqNum: 73
        theIPS: 6 1 26 17 0 8 7 9 5 11 lookupQ:
      2.1 ha_em_peers: GL: 6 seqNum: 30 theIPS: 6 0 8 7 5 11 lookupQ:
       
      

      The bottom few lines display the group membership information. For example, the GL node of the group cssMembership is node 6, and its participating nodes are "6 1 26 17 0 8 7 9 5 11".

2. If you need only the GL node of a specific group, the hagsvote command gives the answer. Issue the command:

   hagsvote -s hags
   

   The output is similar to:

   Number of groups: 3
   Group slot #[0] Group name [HostMembership] GL node [Unknown] voting data:
   No protocol is currently executing in the group.
   --------------------------------------------------
    
   Group slot #[1] Group name [cssRawMembership] GL node [Unknown] voting data:
   No protocol is currently executing in the group.
   --------------------------------------------------
    
   Group slot #[2] Group name [cssMembership] GL node [6] voting data:
   No protocol is currently executing in the group.
   

   In this output, node 6 is the GL node of the group cssMembership. If the GL node is Unknown, this indicates that no client applications tried to use the group on this node.