公开(公告)号：GB2519549A

公开(公告)日：2015-04-29

申请号：GB201318780

申请日：2013-10-24

Applicant: IBM

Inventor： SHERWOOD DAVID ,  BODEN IAN ,  SANDERS LEE JASON ,  NORTH GERAINT

IPC: G06F12/08 ,  G06F12/0804 ,  G06F12/0806 ,  G06F12/0868 ,  G06F12/0871

Abstract: A controller (24) is adapted to issue write permissions to a plurality of data storage devices (32), the write permissions including a permission to perform a data destage operation from a cache (22) to a data storage device (32); wherein each cache has a first performance score expressed as the difference between the number of data destage operations the cache has in flight and the maximum number of data destage actions the cache is permitted to issue in parallel; and wherein the controller is adapted to offer a data destage operation permission to the cache in the plurality of caches associated with the highest first performance score.