公开(公告)号：AT368886T

公开(公告)日：2007-08-15

申请号：AT04741751

申请日：2004-06-08

Applicant: IBM

Inventor： FACTOR MICHAEL ,  FIENBLIT SHACHAR ,  HAYARDENY AMIRAN ,  JARVIS THOMAS ,  MATOSEVICH RIVKA ,  MICKA WILLIAM ,  NURIEL IFAT ,  RAHAV SHELI ,  SHUKEVICH SVETLANA ,  SPEAR GAIL ,  TAL SIVAN ,  TZAFRIR DALIT

IPC: G06F3/06 ,  G06F11/20 ,  G06F12/00 ,  G06F12/08

Abstract: Provided are a method, system, and program for managing a relationship between one target volume and one source volume. For each of the source volume and target volume, the memory includes: (i) at least one element, wherein each element represents a range of sequential data units in the volume; (ii) at least one relationship entry, wherein each relationship entry represents one relationship; (iii) at least one element pointer associating one element with one relationship entry, wherein the data units represented by the element are part of the relationship represented by the relationship entry that the pointer associates with the element; and (iv) one relationship pointer for each relationship entry associating the relationship entry with volume metadata, wherein the volume metadata provides information on the relationship represented by the relationship entry.

公开(公告)号：DE602004002216D1

公开(公告)日：2006-10-12

申请号：DE602004002216

申请日：2004-06-11

Applicant: IBM

Inventor： STANLEY WARREN ,  MICKA FRANK ,  WERNER CLARK ,  TAL SIVEN ,  SPEAR ANDREA ,  BROWN MARY ,  SANCHEZ MATTHEW ,  RAHAV SHELI ,  JARVIS CHARLES ,  HAYARDENY AMIRAM ,  TZAFRIR DALIT ,  FIENBLIT SHACHAR ,  MATOSEVICH MAYRAZ ,  SHUKEVICH SVETLANA ,  NURIEL IFAT

IPC: G06F11/20 ,  G06F11/14

Abstract: Disclosed is a technique for reducing an amount of data transferred. A first indicator is maintained for each source block of data to indicate whether the source block of data has been updated in source storage since the source block of data was last transferred to target storage. A second indicator is maintained for each target block of data in target storage to indicate whether the target block of data has been updated in target storage since the target block of data was overwritten by a corresponding source block of data. When transferring data from the source storage to the target storage, each source block of data for which a first indicator has been set to indicate that the source block of data has been updated is transferred and each source block of data that corresponds to a target block of data for which a second indicator has been set to indicate that the target block of data has been updated is transferred.