SQL Server 2008 R2 - Max server memory setting

Discussion created by pkowta on Mar 13, 2012
I've been trying to find some recommendations for the maximum server memory setting in SQL Server 2008 R2 and haven't had any luck.

Is anyone willing to share how they have configured their environment?

Does anyone have any guidelines for determining if there is enough memory allocated to SQL Server?  I have seen a number of discussions about using the Page Life Expectancy performance counter with a threshhold of 300.  This number seems to be up for debate.

Our Environment:
  15 or fewer simulataneous desktop ArcGIS users
  12 or so ArcReader clients
  20 map services with a couple thousand hits/day total
  ArcSDE 9.3.1
  Windows Server 2008 R2
    4 cpu, 6 Gb RAM
  SQL Server 2008 R2
    3500 Mb max server memory
    9 spatial databases
    2 non-spatial databases for enterprise permitting app

Thanks in advance for any guidance, suggestions, etc.