PRIMARY

This parameter indicates whether this CA‑GSS address space is the primary CA‑GSS address space.

PRIMARY {YES|NO}

YES

Identifies this address space as the primary one for CA‑GSS on this z/OS image.

If another CA‑GSS address space is currently the primary one, that address space's status is changed to secondary.

NO

Identifies this address space as the secondary one for CA‑GSS on this z/OS image.

Each z/OS image can have exactly one primary CA‑GSS address space, but it can have many secondary CA‑GSS address spaces.
Service requests that are not routed to a particular address space (by subsystem ID) are automatically routed to the primary one.
By default, the address space that executes the GSSMAIN program is considered primary, while address spaces that execute the SRVSYS program are considered secondary.
The GSSMAIN program reserves a system linkage index (LX) for cross-memory communication. When GSSMAIN terminates, the system marks the address space as non-reusable. To cycle CA‑GSS repeatedly (for example, during initial installation and testing), you can execute the GSSMAIN program as a secondary CA‑GSS address space. This lets you cycle your primary CA‑GSS address space without destroying address spaces.