Shared Disk Architecture

The shared disk configuration of Sun Cluster is used by OPS. In this configuration, a single database is shared among multiple instances of OPS, all of which access the database concurrently. Conflicting access to the same data is controlled by means of a distributed lock manager (the Oracle UNIX Distributed Lock Manager (DLM)). If a process or a node crashes, the DLM is reconfigured to recover from such failure.