Configuring Failovers
A failover setup has a few basic requirements: nearly identical hardware and software for the master and backup servers, multiple common network interfaces (Ethernet or FireWire), and the ability to connect to common networks and common storage. Initial failover configuration requires several steps:
1 Configure the primary Ethernet interface of each server to connect to [...]

A pageout occurs when memory is written to the backing store. Unlike older methods, Mac OS X pages rather than swaps. In earlier systems, a program was either fully in main memory or was swapped out entirely. Mac OS X, on the other hand, can take pages 4k blocks of RAM and get them out [...]