Establishing a point-in-time copy relationship between source logical addresses and target logical addresses

摘要

Provided are a computer program product, system, and method for establishing a point-in-time copy relationship between source logical addresses and target logical addresses. A point-in-time (PiT) copy establish command specifies a source set comprising a subset of source logical addresses in at least one storage and a target set comprising a subset of target logical addresses in the at least one storage. The source set of source logical addresses are copied to the target set of target logical addresses. The source logical addresses map to source tracks and wherein the target logical addresses map to target tracks. Copy information is generated indicating whether the source logical addresses in the source set have been copied to the target set. Complete is returned to the PiT copy establish command after generating the copy information and before copying all the source logical addresses to the target logical addresses.

主权项

1. A computer program product for copying data involving at least one storage, wherein the computer program product comprises a non-transitory computer readable storage medium having computer readable program code embodied therein that executes to cause operations, the operations comprising:
processing a point-in-time (PiT) copy establish command specifying a source set comprising a subset of source logical addresses in a source volume in the at least one storage and a target set comprising a subset of target logical addresses in a target volume in the at least one storage, wherein the target set of target logical addresses maps to only a portion of at least one of a first target track and a last target track of the target tracks, wherein the source set of source logical addresses are copied to the target set of target logical addresses, wherein the source logical addresses map to source tracks and wherein the target logical addresses map to target tracks; generating, in response to processing the PiT copy establish command, copy information by:
generating a copy map including a plurality of indicators, wherein each of the indicators represents a plurality of the target logical addresses;determining copy indicators from the indicators representing the target set of logical addresses; andsetting at least one of the copy indicators, except for the copy indicators for the at least one of the first target track and the last target track, to indicate that the source logical addresses mapping to the target logical addresses represented by the copy indicators needs to be copied as part of the PiT establish copy operation, and wherein the copy indicators for the at least one of the first target track and the last target track indicate that the source logical address mapping to the target track do not need to be copied; copying the source logical addresses that map to at least one of the first target track and the last target track to at least one of the first target track and the last target track; and returning complete to the PiT copy establish command after generating the copy information and before copying all the source logical addresses to the target logical addresses.