Each of the examples involves one or two databases: databaseA and databaseB. By default, LifeKeeper offers a tag name matching the Oracle database system identifier (SID). However, the screen examples in the following pages use tag names consisting of the SID and server name such as databaseA-on-server1.
To understand the configuration examples, keep these configuration requirements in mind:
- LifeKeeper hierarchy. When performing LifeKeeper administration, the primary server refers to the location where the Oracle instance is currently running. System administration takes place on this server when creating a LifeKeeper hierarchy. For the configuration examples, the primary server is Server 1 and the backup or alternate server is Server 2.
- Shared disk locked by one server. When shared storage resources are under LifeKeeper protection, they can only be accessed by one server at a time. If the shared device is a disk array, an entire LUN is protected. If a shared device is a disk, then the entire disk is protected. This prevents inadvertent corruption of the data by other servers in the cluster. When a server fails, the highest priority backup server establishes its own protection, locking out all other servers.
- Database on shared disk. In order for the LifeKeeper Oracle Recovery Kit to function properly, the database must always be on a shared device. The database may be on one or more file systems and/or disks.
Note: The tables associated with each configuration illustration provide examples of the appropriate information that would be entered in the Create Resource Hierarchy wizard on the primary server (Server 1) and Extend Resource Hierarchy wizard to the backup server (Server 2). For additional detail on what information to enter into the wizards, refer to the “LifeKeeper Configuration Tasks” section. These tables can be a helpful reference when configuring your Recovery Kit.