High PF Usage

The system is a Clustered x64 SQL Server 2005 SP2 Standard 32G of RAM. The task manager show the PF Usage as high as 27G. Any ideas why the usage would be so high?

Did you give the "Lock Pages in Memory" right to the SQL Server Service account? This is extremely important for 64-bit SQL Server 2005. Otherwise, the OS controls paging instead of SQL Server. I have some more details below:

http://glennberrysqlperformance.spaces.live.com/blog/cns!45041418ECCAA960!115.entry