Abstract: Consistent distributed storage communication protocol semantics, such as SCSI target semantics, in a SAN-attached 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.
Type:
Grant
Filed:
September 23, 2011
Date of Patent:
March 25, 2014
Assignee:
NetApp, Inc.
Inventors:
Pranab Patnaik, Kai Tan, Vivek Venkatesan