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Chapter 8. Using Clustering and Locking Systems

This chapter describes how to use the clustering and locking systems available with GFS, and consists of the following sections:

8.1. Locking System Overview

The GFS OmniLock interchangeable locking/clustering system is made possible by the lock_harness.o kernel module. The GFS kernel module gfs.o connects to one end of the harness, and lock modules connect to the other end. When a GFS file system is created, the lock protocol (or lock module) that it uses is specified. The kernel module for the specified lock protocol must be loaded subsequently to mount the file system. The following lock protocols are available with GFS: