Load Balancing - Server Load

CPU Load - The average percentage of time all processors in the computer housing the NAS are in use.

Disk Input/Output - The rate the system is issuing read and write operations to the hard disk.

Memory Thrash - The number of pages read from and written to the hard disk drive to resolve memory references to pages not in memory.

Number of Requests Queued - The number of AppLogic requests that a server is currently processing. Weight this heavily if you want your load balancing to work more like the round robin style of load balancing.