PostgreSQL 8.2beta3 Documentation | ||||
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Shared disk failover avoids synchronization overhead by having only one copy of the database. It uses a single disk array that is shared by multiple servers. If the main database server fails, the backup server is able to mount and start the database as though it was recovering from a database crash. This allows rapid failover with no data loss.
Shared hardware functionality is common in network storage devices. One significant limitation of this method is that if the shared disk array fails or becomes corrupt, the primary and backup servers are both nonfunctional.