This book is intended for programmers of applications that manage system resources (which may or may not be subsystems) who want to use Group Services to make their applications highly available. This book contains information for programmers who want to write new clients that use the GSAPI or add the use of Group Services to existing programs.
It assumes that you are an experienced C programmer and have a thorough understanding of RS/6000 SP (SP) hardware, IBM Parallel System Support Programs for AIX (PSSP) software and/or the Enhanced Scalability feature of IBM High Availability Cluster Multi-Processing for AIX (HACMP/ES) software, and AIX operating system fundamentals.
The commands and interfaces described in this book require that you have the appropriate privileges and authorizations. For example, you may need to be running with an effective user ID of root. The specific security requirements for each subroutine and command are listed in the reference material.
For information about managing the Group Services subsystem and its daemons, see PSSP: Administration Guide, SA22-7348. For information about Group Services diagnostic commands, see the IBM redbook RS/6000 SP High Availability Infrastructure, SG24-4838.