Appendix A: SRC and RSCT

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In this appendix, we discuss the two underlying components that provide common functions required by both CSM and GPFS. They are the System Resource Controller (SRC) and the Reliable Scalable Cluster Technology (RSCT).

Attention: 

Under normal operating conditions, there is no need to run the commands described in this appendix; they are automatically initiated as needed. The commands presented here are only to provide internal information that eventually may help to solve any problems that arise. If you have problems with your environment, we recommend that you call the IBM Support Center before trying to solve the problems yourself.

SRC and RSCT components overview

The System Resource Controller and the IBM Reliable Scalable Cluster Technology components provide key capabilities for building and operating a cluster. These two components are used by both the General Parallel File System (GPFS) and Cluster Systems Manager (CSM) products.

Figure A-1 provides a high-level view of how these components relate to Linux, CSM, and GPFS. It may help to refer to this diagram throughout the rest of this chapter.

Figure A-1: SRC and RSCT architecture

The specifics of how CSM and GPFS utilize these components is covered in detail in the following sections.

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