BMC subsystem services
This section provides an overview of BBXS and describes installing and initializing the subsystem in an z/OS system or in an z/OS system running under VM. Understanding BBXS functions and initialization procedures is necessary because the subsystem resides in CSA (common service area) memory and can impact your system performance if not installed, initialized, and used properly.
This section also lists BBXS error messages and abend codes.
Overview of BBXS
BBXS has three parts:
- Formal z/OS subsystem
- Service routines that are dynamically loaded into extended CSA
- Extended CSA memory used for
- Control table (BBCT)
- Subsystem service routines
- Shared data areas
From an external view, BBXS is a proper z/OS subsystem. However, unlike subsystems such as JES2 and JES3, BBXS does not require its own address space. BBXS uses only the SSCTSUSE field of the subsystem's CVT or SSCVT to anchor the BMC Subsystem Services Control Table (BBCT). The BBCT is built during BBXS initialization, and primarily contains pointers to BBXS service routines. These routines return data in response to specific requests from BMC products.
This section contains the following topics: