Parallel processes for performing multiple incremental copies

摘要

A storage controller receives a write command with respect to a track, from a host. A first process determines that the track is a source track and also determines that at least one corresponding target track is in an incremental copy relation to the source track. A second process is generated to modify a target change recording structure, where the second process executes in parallel with the first process.

主权项

1. A method, comprising:
receiving, by a processor, a write command with respect to a track, from a host, wherein in a first type of incremental copy relations, change recording structures are maintained on a source volume and on a single target volume, and wherein in a second type of incremental copy relations, no change recording structures are maintained on the source volume and the change recording structures are maintained on one or more target volumes; determining, whether the write command is for writing to the source volume; in response to determining that the source volume does not have only the second type of incremental copy relations, determining whether the source volume has both the first type and the second type of incremental copy relations; and in response to determining that the source volume has both the first type and the second type of incremental copy relations, modifying change recording structures both in the source volume and in target volumes of the second type of incremental copy relations.