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should you allow sql server to use all cpu's on a server or cluster?


We are experiencing performance issues on a 3 Node SQL Server 2008 Cluster. Active instance was on node 2 and the memory used by SQL Server was 31GB. Each node has 32gb of RAM. The SQL Server memory settings are 12gb minimum to 28 maximum. I question the memory settings for SQL Server and I suggest that it be modified to 10gb minimum to 20gb maximum. We had an issues with application having slow response time due to this memory issue. Also we discovered that SQL Server is using all 24 processors. Should we set SQL Server to use 14 processors instead?  
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Scott PletcherSenior DBACommented:
It depends on the other activity/load on the server.

If the server also hosts an app -- which from your q it seems to -- you should definitely limit the memory SQL users.  With 32G in the box, I would say 24 rather than 20, but 28 is probably too high.

Likewise, maybe 16-20 processors.  Typically a normal app won't require as much processor proportional to what SQL Server uses.
Scott PletcherSenior DBACommented:
If you then have any performance issues in SQL Server, you can use os_wait_stats and traces / perfmon (if needed) to adjust as needed for best SQL performance.
You have three nodes and only one active node while other nodes have no additional roles or other SQL instances?
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