2 servers can do "Mirroring" are there 3 servers in Sharepoint 2010 Server mirroring?

Hello Community
    In providing availability using Sharepoint 2010 Server using "Mirroring"
you need a "Principal, Mirror and a Witness".
    Logically speaking the principal and mirror I would say are the two servers
that are involved in Sharepoint 2010 Server availability.
    The question is in a 2 server farm what is the "Witness" in availability,is it a Sharepoint
2010 Server, is it the Domain Controller or is it a separate server and do you have
to purchase a copy of Sharepoint 2010 Server to run it on?
    Thank you
    Shabeaut

For SharePoint web front end servers you use multiple web servers and a load balancing service or device. SharePoint application server will auto load balance.  For database servers you can use database mirroring. The running SQL server is the Primary,
the backup SQL server is the Mirror and the Witness is any other SQL server.
Be aware that SQL mirroring is going away in the future:
http://msdn.microsoft.com/en-us/library/ms190202.aspx
More on mirroring:
http://msdn.microsoft.com/en-us/library/ms189852.aspx (click the dropdown on the page for each SQL version.
Mike Smith TechTrainingNotes.blogspot.com
Books:
SharePoint 2007 2010 Customization for the Site Owner,
SharePoint 2010 Security for the Site Owner

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