Emc Corporation

Derek Scott

Eric R Vook

Michael Lee Burriss

Helga M Sonner

Dennis Thomas Duprey

Karl M Owen

Chung-Huy Chen

Mike Bezera

Mayank Ajmera

Carson Jeffrey Barker

Michael W Bezera

Thais Parsons

Gregory T Hunt

Systems, methods, and computer readable media for lazy compression of data incoming to a data storage entity are disclosed. According to one aspect, a method for lazy compression of data incoming to a data storage entity includes defining at least a portion of the data storage area within the data storage entity as a compressed logical unit for storing at least some data in compressed form; receiving a command to write data to the compressed logical unit, and, in response to receiving the command to write data to the compressed logical unit, writing the data in uncompressed form; and monitoring for a trigger condition, wherein, upon detection of a trigger condition, at least a portion of the uncompressed data within the compressed logical unit is compressed.

Systems, methods, and computer readable media for lazy compression of data incoming to a data storage entity

Systems, methods, and computer readable media for accessing and compressing data at a virtually provisioned storage entity are disclosed. According to one aspect, a method includes receiving, at a data storage entity, an input/output (I/O) command to perform an operation on data associated with a logical block address (LBA) in a virtually provisioned device in the data storage entity, wherein the data storage entity has established an expanded private LBA space for the virtually provisioned device in the data storage entity to include both a compressed LBA space portion for storing compressed data and an associated uncompressed LBA space portion for storing uncompressed data. The method further includes determining if a data chunk containing the data in the uncompressed LBA space is available using the LBA in the I/O command to access the data chunk. If the data chunk in the uncompressed LBA space is available, the method includes performing the operation on the data chunk. If the data chunk in the uncompressed LBA space is not available, the method includes accessing the data chunk in the compressed LBA space using both the LBA and a predefined offset value and performing the operation on the data chunk.

Systems, methods, and computer readable media for compressing data at a virtually provisioned storage entity

A method and system for recovering nodes in a hierarchical computer network is disclosed. The operating system of the network detects and exception condition, recovers only the nodes within the scope of the exception condition, and issues I/O requests to nodes during recovery that are not within the scope of the exception condition. The method may involve a computer network system with a plurality of paths connected to adapters on at least one host computer for managing input/output (I/O) requests between the host computer and fibre channel devices, which have a plurality of logical units (LUNs) associated therewith.

Hierarchical recovery method for fibre-channel devices

A method and system for managing I/O resources for communications between a host and a target device through at least one adapter, involves setting a local resource associated with each adapter. If a target device cannot accept an I/O request, the local resource associated with each adapter is set to the number of I/O resources currently used by each adapter associated therewith. The host is configured to issue no more than the local resource number of I/O requests to any individual adapter. The local resources may be periodically rebalanced to account for changes in system needs.

Method and system for adaptive resource management

A host system, such as a server, controls a plurality of different class storage devices on a network. The operating system on the host assigns a unique identification to each storage device using a standard protocol and maintains the identification in the operating system. This allows control of the storage devices without complications even though different classes of devices, using differing identification protocols, are assembled on the same network.

Growing community of inventors

Durham, NC, United States of America

Derek Scott