Emc IP Holding Company LLC

John H Lee

Alan Lee Taylor

William C Davenport

Beverly L Davidson

Nagapraveen Veeravenkata Seela

Michael C Brundage

Milind M Koli

A method performed by a data storage apparatus of maintaining filesystem object attributes in connection with a plurality of drivers is provided. Each driver of the plurality is configured to operate on a respective set of filesystem objects. The method includes (a) for each driver of the plurality, creating a respective driver-specific storage volume; (b) storing, within each driver-specific storage volume, attributes specific to respective filesystem objects operated on by the driver of that driver-specific storage volume; and (c) while operating a particular driver of the plurality on a particular filesystem object, using values of the stored attributes specific to that particular filesystem object operated on by that particular driver. An apparatus, system, and computer program product for performing a similar method are also provided.

Per-service storage of attributes

An improved technique involves managing conflicts over data changes between a data change initiator and multiple listeners to allow any of the listeners to prevent the initiator from changing data. Along these lines, a data change notification process resides in a storage processor in memory outside of an I/O stack in which the listeners and data change initiators reside. When a data change initiator prepares to perform a data change operation, it notifies the data change notification process. The data change notification process in turn sends a notification to the listeners that have registered with the data change notification process. If there is a peer data change notification process on another storage processor, the data change notification process sends a notification to that peer data change notification process so that the peer data change notification process may notify its registered listeners.

Maintaining data consistency when data is changed out from under another data service

Growing community of inventors

Durham, NC, United States of America

John H Lee