Global resource serialization has the following groups when in RING and STAR mode:

• The SYSGRS group with one active member for each system in the sysplex. The members in this group are used for GRS inter system communications and the status of GRS within the system.
• The SYSGRS2 group with one member for each sysplex. The members of the SYSGRS2 group are used to manage the ISGLOCK structure including the migration from RING to STAR mode.