GAB (Group membership and Atomic Broadcast) is responsible for cluster membership and cluster communication in Symantec CFS and VCS clusters. It relies on the LLT (Low Latency Protocol) for these cluster communications.
To check the GAB port membership status run
# /sbin/gabconfig -a
This checks the GAB port membership status.
[root@cfsl1 ~]# gabconfig -a GAB Port Memberships =============================================================== Port a gen 26cd2c membership 01234 Port b gen 26cd2d membership 01234 Port d gen 26cd31 membership 01234 Port f gen 26cd4f membership 01234 Port h gen 26cd3f membership 01234 Port v gen 26cd3e membership 01234 Port w gen 26cd40 membership 01234
In the output,
port a - used by GAB port b - Used by I/O fencing module communication port d - used by Oracle Disk Manager(ODM) to communicate with other ODM instances to support the Oracle Managed File (OMF) across the cluster port f - used CFS for GLM lock and metadata communications port h - used by VCS to communicate resource status on each system to all systems in the cluster port o - used by VCS Membership module port v - used by CVM port w - used by vxconfigd daemon for CVM