公开(公告)号：EP2250563A4

公开(公告)日：2013-01-16

申请号：EP08871518

申请日：2008-10-01

Applicant: IBM

Inventor： ABALI BULENT ,  BANIKAZEMI MOHAMMAD ,  HAFNER JAMES L ,  POFF DAN E ,  SURUGUCCHI KRISHNAKUMAR

IPC: G06F11/10

CPC classification number: G06F11/1092 ,  G06F11/1662 ,  G06F11/2094

公开(公告)号：WO2006083327A2

公开(公告)日：2006-08-10

申请号：PCT/US2005030847

申请日：2005-08-31

Applicant: IBM ,  BANIKAZEMI MOHAMMAD ,  POFF DAN

Inventor： BANIKAZEMI MOHAMMAD ,  POFF DAN

IPC: G06F3/06

CPC classification number: G06F11/1435 ,  G06F3/0608 ,  G06F3/065 ,  G06F3/067 ,  G06F11/1471

Abstract: A method and service creates and maintains a virtual point-in-time copy of source data stored within a source storage unit. The method/service receives at least one request to create a point-in-time copy of the source data. However, instead of creating a copy of the source data, the invention creates a target storage unit mapping table within a target storage unit or other storage units managed by the same storage system. This target storage unit mapping table contains pointers to the source data. In addition, the invention maintains a modification space within the target storage unit or other storage units managed by the same storage system. Each portion of the modification space is associated with a given target storage unit. The modification space only stores changes to the source data that are unique to the corresponding target storage unit. The target storage unit mapping table is modified as the data is written to the modification space by redirecting corresponding pointers in the target storage unit mapping table from the source data to the modification space.

Abstract translation: 方法和服务创建并维护存储在源存储单元内的源数据的虚拟时间点拷贝。 该方法/服务接收至少一个创建源数据的时间点拷贝的请求。 然而，本发明不是创建源数据的副本，而是在目标存储单元或由同一存储系统管理的其他存储单元内创建目标存储单元映射表。 该目标存储单元映射表包含指向源数据的指针。 另外，本发明在由同一存储系统管理的目标存储单元或其他存储单元内维护修改空间。 修改空间的每个部分与给定的目标存储单元相关联。 修改空间仅存储对相应目标存储单元唯一的源数据更改。 通过将目标存储单元映射表中的相应指针从源数据重定向到修改空间，将目标存储单元映射表修改为数据被写入修改空间。

公开(公告)号：CA2593289A1

公开(公告)日：2006-08-10

申请号：CA2593289

申请日：2005-08-31

Applicant: IBM

Inventor： BANIKAZEMI MOHAMMAD ,  POFF DAN E

IPC: G06F3/06 ,  G06F11/14

Abstract: A method and service creates and maintains a virtual point-in-time copy of source data stored within a source storage unit. The method/service receives at least one request to create a point-in-time copy of the source data. However, instead of creating a copy of the source data, the invention creates a target storage unit mapping table within a target storage unit or other storage units managed by the same storage system. This target storage unit mapping table contains pointers to the source data. In addition, the invention maintains a modification space within the target storage unit or other storage units managed by the same storage system. Each portion of the modification space is associated with a given target storage unit. The modification space only stores changes to the source data that are unique to the corresponding target storage unit. The target storage unit mapping table is modified as the data is written to the modification space by redirecting corresponding pointers in the target storage unit mapping table from the source data to the modification space.