International Business Machines Corporation

Nancy J Finn

Michael E Browne

Christina Ann Lara

Maria Rose Ward

Louie Arthur Dickens

Tara Lynn Astigarraga

Christopher V Derobertis

Embodiments relate to method and computer program products which prioritize the logical units in a subgroup. Thereafter, in case of abnormal operation of the process for copying the consistency group from primary storage to secondary storage, low priority logical units of the subgroups of the consistency group are not copied from primary storage to secondary storage.

Ordering logical units in a subgroup of a consistency group

A method and system for monitoring and analyzing flow control of packets in a communications network which includes multiple data transmission paths. The communications network has a first data path including an initiating node and a target node. A test frame is generated by an initiator module of a program executed by a computer for transmission over the first data path. The initiator module transmits the test frame over the first data path from the initiating node to the target node, wherein the test frame records a starting timestamp recorded by the initiating node upon transmitting the test frame. The test frame records a half trip timestamp recorded by the target node upon the test frame being received by the target node. The test frame records an end timestamp recorded by the initiating node, upon the test frame being received at the initiating node from the target node.

Method and apparatus to monitor and analyze end to end flow control in an Ethernet/enhanced Ethernet environment

A method which prioritizes the subgroups in a consistency group by usage and/or business process. Thereafter, in case of abnormal operation of the process for copying the consistency group from primary storage to secondary storage, only a portion of the subgroups of the consistency group are copied from primary storage to secondary storage.

Prioritizing subgroups in a consistency group

A method is provided for facilitating data replication in a storage system. A logical volume of a first storage array of a replicated pair is preconfigured with one or more logical volume attributes, which include a compressible configuration bit that indicates whether data blocks to be stored to that logical volume are compressible during replication. Subsequently, with receipt of a data block at the first storage array to be stored to the logical volume, a check of the compressible configuration bit is made to determine whether the data block is compressible during replication, and if so, the data block is compressed for replication. The compressible configuration bit is placed into the payload region of the data packet being replicated to the second storage array. At the second storage array, the compressible configuration bit is used to determine whether to uncompress the replicated data block.

Facilitating data compression during replication using a compressible configuration bit

Computer program product, system and method are provided for facilitating data replication in a storage system. A logical volume of a first storage array of a replicated pair is preconfigured with one or more logical volume attributes, which include a compressible configuration bit that indicates whether data blocks to be stored to that logical volume are compressible during replication. Subsequently, with receipt of a data block at the first storage array to be stored to the logical volume, a check of the compressible configuration bit is made to determine whether the data block is compressible during replication, and if so, the data block is compressed for replication. The compressible configuration bit is placed into the payload region of the data packet being replicated to the second storage array. At the second storage array, the compressible configuration bit is used to determine whether to uncompress the replicated data block.

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Stormville, NY, United States of America

Nancy J Finn