International Business Machines Corporation

Christophe Fagiano

Itzhack Goldberg

Neil Sondhi

Daniel James Winarski

Carl Evan Jones

Michael Hirsch

Frank Krick

Moriel Lechtman

Lionel Denecheau

Denis Esteve

William G Tuel, Jr

Christophe Lombard

Richard J Coppinger

Gary J Mincher

Sandor Lengyel

Christophe Pierre Francois Quintard

For adding cooperative file coloring protocols in a data deduplication system using a processor device in a computing environment, a preferred character is represented for file coloring in a file using a code selected from a multiplicity of codes that represent a variety of contexts. The original meaning of the preferred character is retained when representing the preferred character for the file coloring by the code selected from the multiplicity of codes. The file is deduplicated by the data deduplication system according to the file coloring that represents a source file of a backup application.

Adding cooperative file coloring protocols in a data deduplication system

A method for selectively compressing unstructured data includes preparing, at a host system, a data blob made up of unstructured data, for storage on a storage system. The method encodes a first portion of the data blob with a first color and a second portion of the data blob with a second color. The first color indicates that the associated portion should remain uncompressed, while the second color indicates that the associated portion should be compressed. The method transmits the encoded data blob to a storage virtualization layer associated with the storage system. In response, the storage virtualization layer stores the first portion in an uncompressed format, and compresses the second portion and stores the second portion in a compressed format. A corresponding system and computer program product are also disclosed herein.

Selective compression of unstructured data

A hybrid compressed media is maintained by detecting hot data within a logical unit name (LUN), and compressing a remaining cold data within the LUN while keeping the hot data uncompressed. The uncompressed hot data and the compressed cold data are both stored within the LUN.

Hybrid compressed media in a tiered storage environment

For adding cooperative file coloring protocols in a data deduplication system using a processor device in a computing environment, a preferred character is represented for file coloring in a file using a code selected from a multiplicity of codes that represent a variety of contexts. The original meaning of the preferred character is retained when representing the preferred character for the file coloring by the code selected from the multiplicity of codes.

For efficient handing of semi-asynchronous RAID write failures using a processor device in a computing environment, a write operation is committed on a primary copy of data on a primary entity while sending the data to a secondary entity while awaiting an acknowledgment by the secondary entity. The acknowledgment indicates to the primary entity that metadata for the write operation has arrived at the secondary entity without necessarily indicating the data has arrived at the secondary entity.

Efficient handling of semi-asynchronous raid write failures

For efficient handing of semi-asynchronous RAID write failures using a processor device in a computing environment, a write operation is committed on a primary copy of data on a primary entity while sending the data to a secondary entity while awaiting an acknowledgment by the secondary entity. The acknowledgment indicates to the primary entity that metadata for the write operation has arrived at the secondary entity without necessarily indicating the data has arrived at the secondary entity. The acknowledgment is sent from the secondary entity regardless of a write failure and allowing the secondary entity to perform a recovery operation if a write failure occurs.

Efficient handing of semi-asynchronous raid write failures

A hierarchical fanout connectivity infrastructure is built and used to start a parallel application within a parallel computing environment. The connectivity infrastructure is passed to a checkpoint library, which employs the infrastructure and a defined sequence of events, to perform checkpoint, restart and/or migration operations on the parallel application.

Fanout connectivity structure for use in facilitating processing within a parallel computing environment

The invention aims to implement the Load Balancing/Backup function in a Multi-Users environment and to allow a remote station to have an alternate route through another Token Ring DLC to backup. By directing the connection to another route, it postpones the connection from a remote station to a Token Ring user through a first selected Token Ring DLC for a predetermined delay. For that purpose, each Token Ring DLC stores parameters of the remote station that has an unsuccessful connection in its own Connection Cache Table. In this way, when a Test frame is received in each DLC, this latter checks in the Connection Cache Table before responding to the Test frame. The Test frame is ignored and no Test response is sent back to the remote station when the remote station is identified in the table so as to allow the remote station to detect an alternate route with a backup DLC if it exists. Each Token Ring DLC manages its own Connection Cache table which contains an entry, a source MAC address and a Source SAP and a counter indicating the number of unsuccessful attempted Test frames received from that remote station. If the counter reaches a value N, then the entry corresponding to the remote station is removed from the table. Thus, the next time a Test frame is received from this remote station, it is accepted and a response is sent from the DLC. It gives a new opportunity to the remote station to establish a connection to the user in case this latter would become available again.

Growing community of inventors

Mouans-Sartoux, France

Christophe Fagiano