Production of a time point copy - relationship between logical source addresses and logical destination addresses

摘要

A computer program product, in order to copy data, wherein at least one memory, is involved in the computer program product comprising a nonvolatile of a computer readable storage medium, on which of a computer readable program code is located, which is designed, in order to cause operations, wherein the operations have:Processing of a command for creating a point in time - (pit -) copy, the one sources set, which a partial quantity of logical source addresses of a swelling data carrier in the at least one memory, and a goal set indicates which of a subset of logical destination addresses of a target volumes in the at least one memory, wherein the sources set of logical source addresses in the goal set of logical destination addresses, is copied, wherein the logical source addresses sources tracks are allocated, and wherein the logical addresses to be assigned to target tracks;in response to the processing of the command for creating a pit - copy generation of copy information; andReflection of ‘ considers ‘ carried out at the command for creating a pit - copy, after the copy information were produced and before all logical source addresses to the logical addresses to be copied,the goal set only one part of a first target track and / or a last target track of the target tracks, which contain the goal set is allocated to,wherein the producing of the has copy information:Generating a copy - assignment, which contains a plurality of indicators, wherein each of the indicator represents a plurality of the logical destination addresses;Determination of copy - indicators of the indicators, the goal set of logical addresses; andn="24"Setting of at least one of the copy - indicator such that it indicates that the logical source addresses, which are assigned to the logical destination addresses, which of the copy - indicators are represented, as part of the operation for producing a pit - copy have to be copied,furthermore, wherein the operations have:Copying of the logic source addresses, the of the first target track and / or the last target track may be assigned to the first, the target track and / or the last target track,wherein the setting of at least one of the copy - indicator the setting of the copy - indicator with the exception of the copy - the indicator for the first target track and / or the last target track, and wherein the copy - the indicator for the first target track and / or the last target track indicating that the logical source address, which is assigned to the target track, does not need to be copied.