Abstract: Provided are a method, system, deployment and program for managing data transfer in consistency group formation. In one embodiment, nodes are periodically polled to determine traffic conditions. An estimated drain time for a node such as the most congested node, for example, is compared to a drain time limit and if within a vicinity of the drain time limit, operations switch to a consistency group formation mode. Other embodiments are described and claimed.

Abstract: Provided are a method, system, deployment and program for managing data transfer in consistency group formation. In one embodiment, a transfer time for a data structure is selected as a function of at least one determined backlog. Upon expiration of the selected transfer time, the mode of operation may be switched. By dynamically selecting a transfer time, backlogs may be reduced to increase the likelihood of successful creation of a consistency group. Other embodiments are described and claimed.

Abstract: Resynchronization of data between a primary (production) data site and a secondary (recovery) site following a failure is enhanced when the size of a data track at the production site is different from the size of a data track at the recovery site. The recovery site reads an out-of-sync (OOS) bitmap created at the production site and expands or contracts the bitmap to accommodate the size difference. The resulting production site bitmap is merged with a OOS bitmap maintained at the recovery site to indicate those tracks which are to be transferred from the recovery site to the production site. Thus, only those tracks which are required to be transferred are transferred. Buffer space may be allocated in which to expand or contract the production site OOS bitmap. Buffer space may be conserved by sequentially reading portions of the production site OOS bitmap into a small buffer.

Abstract: Provided are a method, system, deployment and program for managing data transfer in consistency group formation. In one embodiment, nodes are periodically polled to determine traffic conditions. An estimated drain time for a node such as the most congested node, for example, is compared to a drain time limit and if within a vicinity of the drain time limit, operations switch to a consistency group formation mode. Other embodiments are described and claimed.

Abstract: Resynchronization of data between a primary (production) data site and a secondary (recovery) site following a failure is enhanced when the size of a data track at the production site is different from the size of a data track at the recovery site. The recovery site reads an out-of-sync (OOS) bitmap created at the production site and expands or contracts the bitmap to accommodate the size difference. The resulting production site bitmap is merged with a OOS bitmap maintained at the recovery site to indicate those tracks which are to be transferred from the recovery site to the production site. Thus, only those tracks which are required to be transferred are transferred. Buffer space may be allocated in which to expand or contract the production site OOS bitmap. Buffer space may be conserved by sequentially reading portions of the production site OOS bitmap into a small buffer.

Abstract: Provided are a method, system, deployment and program for managing data transfer in consistency group formation. In one embodiment, a transfer time for a data structure is selected as a function of at least one determined backlog. Upon expiration of the selected transfer time, the mode of operation may be switched. By dynamically selecting a transfer time, backlogs may be reduced to increase the likelihood of successful creation of a consistency group. Other embodiments are described and claimed.

Abstract: An apparatus, system and method of concurrent high-performance transport of variable-length messages are provided. The invention overcomes the problem of transporting a message comprising more bits than the maximum allowable group transmission on a network, by fragmenting the message into a plurality of data packets and transmitting the data packets concurrently. In addition, the present invention overcomes the problem of inefficient storage space allocation for reconstruction of the message from the data packets by sending the size of the message with each data packet.