To reconfigure VCS on existing nodes

1. On Node A, create the files /etc/llttab, /etc/llthosts, and /etc/gabtab. Use the files that are created on Node B as a guide, customizing the /etc/llttab for Node A.
2. Start LLT on Node A.

   For RHEL 7, SLES 12, and supported RHEL distributions:

   # systemctl start llt

   For earlier versions of RHEL, SLES, and supported RHEL distributions:

   # /etc/init.d/llt start

3. Start GAB on Node A.

   For RHEL 7, SLES 12, and supported RHEL distributions:

   # systemctl start gab

   For earlier versions of RHEL, SLES, and supported RHEL distributions:

   # /etc/init.d/gab start

4. Check the membership of the cluster.

   # gabconfig -a

5. Copy the cluster UUID from the existing node to the new node:

   # /opt/VRTSvcs/bin/uuidconfig.pl -clus -copy -from_sys \
   node_name_in_running_cluster -to_sys new_sys1 ... new_sysn

   Where you are copying the cluster UUID from a node in the cluster (node_name_in_running_cluster) to systems from new_sys1 through new_sysn that you want to join the cluster.

6. Start VCS on Node A.

   # hastart

7. Make the VCS configuration writable.

   # haconf -makerw

8. Add Node B to the cluster.

   # hasys -add sysB

9. Add Node B to the system list of each service group.

   • List the service groups.

     # hagrp -list

   • For each service group that is listed, add the node.

     # hagrp -modify group SystemList -add sysB 1