Hewlett-packard Development Company, L.p.

Red Hat, Inc.

Doug Williams

Anand Vishweswaran Avati

Frederick S Glover

Shishir Nagaraja Gowda

Timothy Mark

A management process coordinates a number of servers to create a crash-consistent distributed snapshot. The management process instructs the servers to enter an ambiguity mode in which acknowledgement of barrier operations is delayed, instructs the servers to generate portion snapshots, and instructs the servers to exit the ambiguity mode and acknowledge barrier operations.

Distributed coordinated snapshots

In one embodiment, a method and system for storing a file in a storage domain is provided. The method includes monitoring access to a file to determine a file access pattern, tagging the file to indicate the identified access pattern and using the tag to identify an appropriate storage medium in a storage domain for the file, when available, based on the access pattern.

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Harvard, MA, United States of America

Doug Williams