Patent ID: 7383463
Filing Date: 2008-06-03
Classification: G06F

Abstract:
1. In a disaster recovery environment including a primary file server at an active site and a secondary virtual file server at a disaster recovery site remote from the active site, the secondary virtual file server including a collection of files being replicated from the primary file server to the disaster recovery site, the secondary virtual file server needing resources including network interfaces and file system mounts at the disaster recovery site for providing user access at the disaster recovery site, a method comprising: a) determining whether there are sufficient network interfaces and file system mounts at the disaster recovery site for the secondary virtual file server for providing user access at the disaster recovery site; and b) upon finding that there are sufficient network interfaces and file system mounts at the disaster recovery site for the secondary virtual file server for providing user access at the disaster recovery site, reserving the network interfaces and file system mounts that are needed at the disaster recovery site for providing user access at the disaster recovery site; wherein a primary copy of user mappings is kept at the disaster recovery site, and a read-only cache of the user mappings is kept at the active site.