公开(公告)号：GB2516872A

公开(公告)日：2015-02-11

申请号：GB201313863

申请日：2013-08-02

Applicant: IBM

Inventor： SEIFERT JENS ,  OBERHOFER MARTIN ,  RAKOPOULOS KOSTAS ,  REES STEVE

IPC: G06F3/06 ,  G06F11/30 ,  G06F17/30

Abstract: A method for a logging process in a data storage system (10C) including a set of storage tiers (115), each storage tier of the set of storage tiers (115) having different performancecharacteristics (e.g. error rate, communication rate, power consumption, delay time). The set of storage tiers (115) is divided into subsets (115A, 115B, 115C, 115D) using the performance characteristics. The logging process is initialized for creating a separate log file (121A, 121B, 121C, 121D) for each of the subsets of storage tiers (115A, 115B, 115C, 115D) for maintaining a history of data changes in the subset of storage tiers, thereby creating a plurality of log files (121); in response to a change in data stored in at least one storage tier of a subset of storage tiers (115), generating one or more log records comprising information about the change, and writing the one or more log records into the respective log files (121A, 121B, 1210, 121D). Such log files may be used during backup and restoration.