Did you know

Everyone seems to know that DB roles should not be virtual in SharePoint, but did you know the Index role should also be consider for hardware?  True.

SQL Server has no problems going virtual, and in fact Microsoft has told me 2008 can push 90% performance with Hyper-V.  The issues is that SQL makes a lot of IO transactions in SharePoint.  Its these IO transactions which virtualisation supports poorly and causes reduced performance in a virtual farm.  But 2010 is the target date, I have heard we will have a full virtual farm at all levels in 2010 release.

Lets only hope.

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