Hewlett-packard Development Company, L.P.

Oracle International Corporation

Alan David Brunelle

Per Olov Wahlstrom

Frederick S Glover

Donald Allan Graves, Jr

James Bensson

Pranav Dayananda Bagur

Jr Donald Allan Graves

Techniques are provided for providing a fully active and non-replicated block storage solution in a clustered filesystem that implements cache coherency. In a clustered filesystem where one or more data blocks are stored in a respective cache of each host node of a plurality of host nodes, a request is received at a host node of the plurality of host nodes from a client device to write the one or more data blocks to a shared storage device. In response to the request, the one or more data blocks are stored in the cache of the host node and a particular notification is sent to another host node of the plurality of host nodes that the one or more data blocks have been written to the shared storage device. In response to receiving the notification, the other host node invalidates a cached copy of the one or more data blocks in the respective cache of the other host node.

Fully active and non replicated block storage solution

A method for sharing a storage device amongst a plurality of computers while providing data integrity in the storage device is presented. A computer is registered for a reserved access type with the storage device by storing a computer identifier in the storage device. Access to the storage device is provided to the registered computer dependent on the registered computer's stored identifier and the reserved access type. Upon loss of knowledge of the stored identifier in the shared storage device by the registered computer, the computer replaces the previous identifier for the computer stored in the shared storage device with a new identifier. The registered computer may be a currently registered computer or a previously registered computer.

Persistent reservation IO barriers

Growing community of inventors

Merrimack, NH, United States of America

Alan David Brunelle