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SQL Performance on SBS 2011

I've inherited an SBS 2011 server.   All services are installed on a single partition (C:)  The the customer does heavy sql work using Thompson Reuters CS.  This is a practice management solution for CPAs.

With 36 Gb RAM, everything is hideously slow and 10 users have trouble accomplishing the simplest of tasks.

Does it make sense to move the SQL instances to a separate RAID volume for better performance? (I know this is a broad\general question, but they are not on a budget that would allow them to replace the server with the correct environment.)

Thanks,
Craig
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Cris Hanna
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Part of the issue "could be" if there really is 36 GB of RAM in the server.  Server 2008r2 which SBS 2011 is based on, has limit of 32gb of Ram.   While a single partition is not the best configuration, it's not impossible.  Is this a raid 1 or raid 5 partition?  What kind of drive controller?  yes a separate partition on a good controller could help.  But the real key is running Perfmon to find the real culprit
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Ryan McCauley
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thanks Ryan. just moving email off the server was a tremendous improvement.  Disabled the exchange services with no ill side effects.

great info!