公开(公告)号：GB2581463A

公开(公告)日：2020-08-19

申请号：GB202009753

申请日：2018-11-29

Applicant: IBM

Inventor： LOKESH MOHAN GUPTA ,  KEVIN JOHN ASH ,  CLINT HARDY ,  KARL ALLEN NEILSEN

IPC: G06F12/0868 ,  G06F3/06

Abstract: Copy source to target operations may be selectively and preemptively undertaken in advance of source destage operations. In another aspect, logic detects sequential writes including large block writes to point-in-time copy sources. In response, destage tasks on the associated point-in-time copy targets are started which include in one embodiment, stride-aligned copy source to target operations which copy unmodified data from the point-in-time copy sources to the point-in-time copy targets in alignment with the strides of the target. As a result, when write data of write operations is destaged to the point-in-time copy sources, such source destages do not need to wait for copy source to target operations since they have already been performed. In addition, the copy source to target operations may be stride-aligned with respect to the stride boundaries of the point-in-time copy targets. Other features and aspects may be realized, depending upon the particular application.

公开(公告)号：GB2578080A

公开(公告)日：2020-04-15

申请号：GB202002167

申请日：2018-07-19

Applicant: IBM

Inventor： KYLER ANDERSON ,  KEVIN JOHN ASH ,  MATTHEW JOSEPH KALOS ,  BETH ANN PETERSON ,  LOKESH MOHAN GUPTA

IPC: G06F12/0871 ,  G06F3/06

Abstract: Provided are a computer program product; system, and method for using a track format code in a cache control block for a track in a cache to process read and write requests to the track in the cache. A track format table associates track format codes with track format metadata. A determination is made as to whether the track format table has track format metadata matching track format metadata of a track staged into the cache. A determination is made as to whether a track format code from the track format table for the track format metadata in the track format table matches the track format metadata of the track staged. A cache control block for the track being added to the cache is generated including the determined track format code when the track format table has the matching track format metadata.