High availability for sharepoint 2010

Can be done at the host level, if you have to clustered HyperV host.  That failover would be automatic.

Or it can be done at the application level.  For true HA with only two virtual servers, you would install SQL on both servers to form a SQL cluster.  Failover would be automatic at the SQL level when you have a cluster.  You would also install SharePoint on both boxes, and start all services on both.  For search, you would put a query component and index component on each server.  All application services would failover automatically besides Search, which would require some intervention to move the Admin component to the other box.  As far as web services, failover would be handled by your load balancer.

I'm sure someone will jump in here and try to add to my response, so I'll go ahead and post this as well.

http://technet.microsoft.com/en-us/library/cc748824%28v=office.14%29.aspx

Thank you ACH1LLES but i need more details, if you can tell me or give me link with details can tell me how to do it...