公开(公告)号：GB2494950B

公开(公告)日：2013-08-28

申请号：GB201211748

申请日：2012-07-03

Applicant: IBM

Inventor： LOVRIEN KURT ALLEN ,  GUPTA LOKESH MOHAN ,  BROWN THERESA MARY ,  HATFIELD BRIAN DAVID ,  GRUSY ELLEN JOANNE ,  SABA RAUL EDUARDO ,  MELLGREN CAROL SANTICH

IPC: G06F11/14 ,  G06F3/06

Abstract: A storage controller receives a request to establish a point-in-time copy operation by placing a space efficient source volume in a point-in-time copy relationship with a space efficient target volume, wherein subsequent to being established the point-in-time copy operation is configurable to consistently copy the space efficient source volume to the space efficient target volume at a point in time. A determination is made as to whether any track of an extent is staging into a cache from the space efficient target volume or destaging from the cache to the space efficient target volume. In response to a determination that at least one track of the extent is staging into the cache from the space efficient target volume or destaging from the cache to the space efficient target volume, release of the extent from the space efficient target volume is avoided.

公开(公告)号：GB2494950A

公开(公告)日：2013-03-27

申请号：GB201211748

申请日：2012-07-03

Applicant: IBM

Inventor： LOVRIEN KURT ALLEN ,  GUPTA LOKESH MOHAN ,  BROWN THERESA MARY ,  HATFIELD BRIAN DAVID ,  GRUSY ELLEN JOANNE ,  SABA RAUL EDUARDO ,  MELLGREN CAROL SANTICH

IPC: G06F11/14 ,  G06F3/06

Abstract: A storage controller receives a request 402 to establish a point-in-time copy operation for backup purposes in space-efficient, thin-provisioned storage volumes, by placing a source volume 404 in a relationship with a target volume 406, where each volume comprises a number of extents 408a-p, 410a-q constructed from tracks 412-418. After being established, the operation is arranged to consistently copy the source volume to the target volume at a point in time. During the copy operation, the system checks whether any track of an extent is staging into a cache from the target volume or destaging from the cache to the target volume 420. If that is found to be the case, release of that extent from the target volume is avoided. An extent which is awaiting staging or destaging may also be avoided. This reduces the risk of utilising conflicted extents and speeds up the backup process.