International Business Machines Corporation

Rohit Krishna Prasad

Ravi Shankar

Daniel Isaac Goodman

Senthil Rajaram

Avihu Turzion

Roger C Raphael

Venkateswararao Jujjuri

Craig Fulmer Everhart

Malahal R Naineni

Manohar Rao Bodke

Venkateswarara Jujjuri

Malahal R Nalnenl

Lakshmi Priya Kanduru

The present invention includes establishing, by a storage system coupled to a first host computer via a storage area network (SAN), metrics indicating a status of the first host computer, and storing the indicated metrics to the storage system. A second host computer, coupled to the storage system via the storage area network, determines an availability of the first host computer based on the metrics.

Storage system based host computer monitoring

Methods, apparatus and computer program products implement embodiments of the present invention that include establishing, by a storage system coupled to a first host computer via a storage area network (SAN), metrics indicating a status of the first host computer, and storing the indicated metrics to the storage system. A second host computer, coupled to the storage system via the storage area network, determines an availability of the first host computer based on the metrics.

Provided are systems and methods for accessing a storage device from a node when a local connection failure occurs between the node and the storage device. A failure is determined to have occurred at a first node access path between a first node and a storage device that prevents an application at the first node from accessing the storage device from the first node access path. An access request is sent from the first node to a second node. The second node has a second node access path to the storage device. A determination is made that the second node can communicate with the storage device. The storage device is accessed by an application at the first node via the second node access path.

High availability data storage systems and methods

A buffer of block addresses for use by a client for read and write operations in a client-server system is maintained. Block addresses are maintained in the buffer and are streamed to the client in response to a request for the addresses to support a read or write operation. The quantity of addresses maintained in the buffer may be dynamically adjusted in response consumption of addresses for read and write operations.

Windowing external block translations

A method and system for supporting a concurrent recordation of a change in a data file by a server while allowing an application to continue writing changes to a data file. In response to a change in a data file, a near-instantaneous version of the file is created. Metadata reflecting the change to the data file are synchronized with a version of the file in cache and recorded in persistent storage. During the process of recording metadata changes to the file, subsequent changes to the data file may continue, and metadata reflecting the changes may be recorded in a subsequent near-instantaneous version of the file which may also be synchronized with a version of the metadata in persistent storage.

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Cedar Park, TX, United States of America

Rohit Krishna Prasad