Patent attributes
Consistency groups of federated data centers can be transitioned between active/active multi-writer and active/passive single writer operational modes. In the active/passive single writer mode one or more hosts in a first data center have Write access to a distributed storage resource, but a host in a second data center does not have Write access to that distributed storage resource. In the active/active multi-writer mode hosts in both the first and the second data center have Write access to the distributed storage resource. The active/passive single writer mode is used as a default mode. The active/active multi-writer mode is used when needed for scheduled or unscheduled but qualified events which require mobility, e.g., moving virtual machines or cluster groups.
