Patent ID: 8041761

Claim:
A method for operating a computer system, comprising: executing a filer on the computer, the filer instantiating a first virtual server and a second virtual server; operating the first virtual server in a first security domain to provide access for a client to resources, the client gaining access to the resources by presentation of a first security credentials for comparison with a first security objects of the resources, the first security credentials and the first security objects operable within the first security domain; transitioning the filer from the first security domain to a second security domain by transitioning the client from the first virtual server in the first security domain to the second virtual server in the second security domain; transitioning the resources from the first security domain to a second security domain, the transitioning including upgrading the first security objects to a second security objects operable with the second security domain, the resources accessible by the second virtual server in the second security domain with the second security credentials for comparison with the second security objects; mapping the first security credentials of the client to the second security objects to allow the client to access the resources using the first security credentials to provide a transition of the resources from the first security domain to the second security domain while allowing access to the resources by the client using the first security credentials to permit the client to access the resources using both the first security credentials and the second security credentials after the resources have been transitioned to the second security domain.