Invention Grant
- Patent Title: Method and system for single pass volume scanning for multiple destination mirroring
- Patent Title (中): 用于多目标镜像的单次卷扫描的方法和系统
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Application No.: US11264837Application Date: 2005-11-01
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Publication No.: US07325111B1Publication Date: 2008-01-29
- Inventor: Tianyu Jiang
- Applicant: Tianyu Jiang
- Applicant Address: US CA Sunnyvale
- Assignee: Network Appliance, Inc.
- Current Assignee: Network Appliance, Inc.
- Current Assignee Address: US CA Sunnyvale
- Agency: Cesari and McKenna, LLP
- Main IPC: G06F12/00
- IPC: G06F12/00

Abstract:
A mirroring application running on a primary server in a multiple destination mirroring environment is provided. The mirroring application configures a scanner with snapshots that are registered. The scanner calculates a logical age for each snapshot. The scanner scans a flexible volume once for data blocks that are newer than a predetermined snapshot. The scanner tags each such block with a logical age that is equivalent to the oldest snapshot that refers to that block. The scanner loads the tagged blocks in a queue. A sender module associated with each destination in the mirroring environment inspects blocks in the queue and retrieves only those blocks younger than a destination reference snapshot. The sender sends those blocks to the destination and filters out older blocks, thus bringing the destination mirror up to date with the current active file system.
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