公开(公告)号：WO0113235A9

公开(公告)日：2002-09-06

申请号：PCT/US0021193

申请日：2000-08-02

Applicant: EMC CORP

Inventor： DUPREY DENNIS ,  LUCOVSKY JEFFREY ,  ROA GUILLERMO

IPC: G06F3/06 ,  G06F11/14 ,  G06F11/20 ,  G06F12/00

CPC classification number: G06F11/2082 ,  G06F11/2058 ,  G06F11/2074 ,  G06F2201/855 ,  Y10S707/99953 ,  Y10S707/99955

Abstract: In a remote mirroring system, device, and method, a master storage unit stores information in a log and uses the information from the log to quickly resynchronize slave images following a failure in the master storage unit. Upon receiving a write request from a host, the master storage unit stores a write entry in the log. The write entry includes information that identifies a portion of the slave images that may be unsynchronized from the master image due to the write request. The master storage unit then proceeds to update the master image and the slave images. The log is preserved through the failure, such that the log is available to the master storage unit upon recovery from the failure. When the master storage unit is operational following the failure, the master storage unit resynchronizes the slave images to the master image by copying those portions of the master image indicated in the log to the slave images.

Abstract translation: 在远程镜像系统，设备和方法中，主存储单元将信息存储在日志中，并且使用来自日志的信息来在主存储单元中的故障之后快速重新同步从属图像。 在从主机接收到写入请求时，主存储单元在该日志中存储写入条目。 写入条目包括识别由于写入请求可能与主映像不同步的从属映像的一部分的信息。 然后，主存储单元继续更新主图像和从属图像。 通过故障保留日志，以便在从故障恢复时，主存储单元可用日志。 当主存储单元在故障之后操作时，主存储单元通过将日志中指示的主图像的那些部分复制到从属图像来重新同步从图像到主图像。