Reducing data storage system I/O bandwidth via read-once point in time copy

摘要

A computer-implemented method includes: detecting a read access to one or more data tracks of a target data storage module; and setting a value of one or more bits in response to detecting the read access to the one or more data tracks, each of the one or more bits being associated with one of the one or more data tracks. The value of the one or more bits is set to a value configured to prevent a copy-on-write operation being applied to the one or more data tracks to which the read access was detected. Corresponding systems and computer program products are similarly disclosed, all of which advantageously improve storage system performance by reducing I/O bandwidth via preventing unnecessary copy operations.

主权项

1. A computer-implemented method, comprising:
detecting a read access to one or more data tracks of a target data storage module; detecting a pending copy-on-write request applicable to one or more of the one or more data tracks of the target data storage module; setting a value of one or more bits in response to detecting the read access to the one or more data tracks, each of the one or more bits being associated with one of the one or more data tracks; and wherein the value of the one or more bits is set to a value configured to prevent a copy-on-write operation being applied to the one or more data tracks to which the read access was detected, the copy-on-write operation corresponding to the copy-on-write request.