CONSISTENT DISTRIBUTED STORAGE COMMUNICATION PROTOCOL SEMANTICS IN A CLUSTERED STORAGE SYSTEM

摘要

Consistent distributed storage communication protocol semantics, such as SCSI target semantics, in a clustered storage system are disclosed. The system includes a mechanism for presenting a single distributed logical unit, comprising one or more logical sub-units, as a single logical unit of storage to a host system by associating each of the logical sub-units that make up the single distributed logical unit with a single host visible identifier that corresponds to the single distributed logical unit. The system further includes a mechanism to maintain consistent context information for each of the logical sub-units such that the logical sub-units are not visible to a host system as separate entities from the single distributed logical unit.

主权项

1. A method comprising:
in a clustered storage system that has multiple storage server nodes, implementing a first logical sub-unit associated with at least a data storage object in a first storage server node; maintaining, for the first logical sub-unit, context information that is consistent with corresponding context information of a second logical sub-unit 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.