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1. Close Distance Rule:

Keep Web Frontends, Application Servers and Database Servers physically located as close as  possible.

 

Rule of thumb: No more than 1 ms of latency between WFEs/AS and DB servers. In practice, this means: WFEs/ASs should reside in the same data center as DB servers.

 

 

2. Co-Location/Separation of Databases

Certain databases must be co-located or ideally separated from other databases.

 

Rule of thumb: Separate the following databases:

 

 

 

image

Source: Microsoft Technet

 

Rule of thumb: Co-locate the following databases:

 

 

image

Source: Microsoft Technet

 

3. Constantly Monitor Database Servers

Size: Rules of thumb:

    Pre-grow databases and logs.

    Monitor disk space at all times.

    < 50 Databases per SQL Server instance (when mirroring)

                          < 200 GB per content database

 

 

Metrics: Rules of thumb:

    Network Queue: 0 or 1 for best performance

    Average Disk Queue length (latency) : < 5 ms

                       Memory used: < 70%

                       Free disk space: > 25%

                       Buffer cache hit ratio: >= 90%

 

4. Transaction Logs Backup

Rule of thumb: Back up and truncate the transaction logs every 5 minutes. Shrinking the transaction logs is not recommended since it will have a performance impact while it re-grows.

 

 

For preventing the transaction logs to grow unexpectedly, view the following KB: http://support.microsoft.com/kb/873235

 

That’s it for this time. Have fun configuring your DB servers for your SP2010 environment. As usual, no responsibility is taken for any damage that could occurr. And as ususal, I highly recommend trying all changes on a test environment and the adaptation to your specific IT infrastructure.

 

Enjoy and best regards,

Martin

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