Patent ID: 8793432

Claim:
A method comprising: in a SAN-attached clustered storage system that has multiple storage server nodes, implementing a first logical sub-unit associated with a set of data storage objects in a first storage server node; maintaining, for the first logical sub-unit, context information implemented in the first storage server node that is consistent with corresponding context information of a second logical sub-unit, wherein the corresponding context information and the second logical sub-unit are implemented in a second storage server node such that the first and second logical sub-units are part of a single distributed logical unit collectively made up by at least the first and second logical sub-units; and associating the first and second logical sub-units with a single host-visible identifier of the single distributed logical unit so that a host can access either the first or the second logical sub-unit of the single distributed logical unit, such that the first and second logical sub-units are not visible to the host as entities separate from the single distributed logical unit.