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1. 发明公开

EP1349088A2 System and method for determining and transmitting changes in snapshots 有权
标题翻译：系统和Verfahren zur Bestimmung undÜbertragungvonÄnderungen在Schnappschüssen
公开(公告)号：EP1349088A2
公开(公告)日：2003-10-01
申请号：EP03251702.1
申请日：2003-03-19
申请人： Network Appliance, Inc.
发明人： Federwisch, Michael L. , Manley, Stephen L. , Owara, Shane S. , Kleiman, Steven R.
IPC分类号： G06F17/30 , G06F11/14
CPC分类号： G06F11/2074 , G06F11/1451 , G06F11/2066 , G06F17/30144 , G06F17/30212
摘要： A system and method for remote asynchronous replication or mirroring of changes in a source file system snapshot in a destination replica file system using a scan (via a scanner) of the blocks that make up two versions of a snapshot of the source file system, which identifies changed blocks in the respective snapshot files based upon differences in volume block numbers identified in a scan of the logical file block index of each snapshot. Trees of blocks associated with the files are traversed, bypassing unchanged pointers between versions and walking down to identify the changes in the hierarchy of the tree. These changes are transmitted to the destination mirror or replicated snapshot. This technique allows regular files, directories, inodes and any other hierarchical structure to be efficiently scanned to determine differences between versions thereof. The changes in the files and directories are transmitted over the network for update of the replicated destination snapshot in an asynchronous (lazy write) manner. The changes are described in an extensible, system-independent data stream format layered under a network transport protocol. At the destination, source changes are used to update the destination snapshot. Any deleted or modified inodes already on the destination are moved to a temporary or "purgatory" directory and, if reused, are relinked to the rebuilt replicated snapshot directory. The source file system snapshots can be representative of a volume sub-organization, such as a qtree.
摘要翻译：用于使用构成源文件系统的快照的两个版本的块的扫描（通过扫描程序）来远程异步复制或镜像目标副本文件系统中源文件系统快照中的更改的系统和方法，基于每个快照的逻辑文件块索引的扫描中识别的卷块号的差异来标识各个快照文件中的改变的块。遍历与文件关联的块的树，绕过版本之间的未改变的指针，并向下走，以识别树的层次结构中的更改。这些更改将传输到目标镜像或复制快照。该技术允许有效扫描常规文件，目录，索引节点和任何其他分层结构，以确定其版本之间的差异。通过网络传输文件和目录中的更改，以便以异步（惰性写入）方式更新复制的目标快照。这些更改以可扩展的系统独立的数据流格式在网络传输协议下分层描述。在目的地，源更改用于更新目标快照。已经在目的地上的任何已删除或已修改的索引节点将被移动到临时或“炼狱”目录，如果重用，将重新链接到重建的复制快照目录。源文件系统快照可以代表卷子组织，例如qtree。

2. 发明授权

EP1349088B1 System and method for determining and transmitting changes in snapshots 有权
标题翻译：系统和方法，用于在快照确定和发送的更改
公开(公告)号：EP1349088B1
公开(公告)日：2010-11-03
申请号：EP03251702.1
申请日：2003-03-19
申请人： Network Appliance, Inc.
发明人： Federwisch, Michael L. , Manley, Stephen L. , Owara, Shane S. , Kleiman, Steven R.
IPC分类号： G06F17/30 , G06F11/14 , G06F11/20
CPC分类号： G06F11/2074 , G06F11/1451 , G06F11/2066 , G06F17/30144 , G06F17/30212
摘要： A system and method for remote asynchronous replication or mirroring of changes in a source file system snapshot in a destination replica file system using a scan (via a scanner) of the blocks that make up two versions of a snapshot of the source file system, which identifies changed blocks in the respective snapshot files based upon differences in volume block numbers identified in a scan of the logical file block index of each snapshot. Trees of blocks associated with the files are traversed, bypassing unchanged pointers between versions and walking down to identify the changes in the hierarchy of the tree. These changes are transmitted to the destination mirror or replicated snapshot. This technique allows regular files, directories, inodes and any other hierarchical structure to be efficiently scanned to determine differences between versions thereof. The changes in the files and directories are transmitted over the network for update of the replicated destination snapshot in an asynchronous (lazy write) manner. The changes are described in an extensible, system-independent data stream format layered under a network transport protocol. At the destination, source changes are used to update the destination snapshot. Any deleted or modified inodes already on the destination are moved to a temporary or "purgatory" directory and, if reused, are relinked to the rebuilt replicated snapshot directory. The source file system snapshots can be representative of a volume sub-organization, such as a qtree.

3. 发明公开

EP1349088A3 System and method for determining and transmitting changes in snapshots 有权
标题翻译：系统和方法，用于在快照确定和发送的更改
公开(公告)号：EP1349088A3
公开(公告)日：2005-04-20
申请号：EP03251702.1
申请日：2003-03-19
申请人： Network Appliance, Inc.
发明人： Federwisch, Michael L. , Manley, Stephen L. , Owara, Shane S. , Kleiman, Steven R.
IPC分类号： G06F17/30 , G06F11/14 , G06F11/20
CPC分类号： G06F11/2074 , G06F11/1451 , G06F11/2066 , G06F17/30144 , G06F17/30212
摘要： A system and method for remote asynchronous replication or mirroring of changes in a source file system snapshot in a destination replica file system using a scan (via a scanner) of the blocks that make up two versions of a snapshot of the source file system, which identifies changed blocks in the respective snapshot files based upon differences in volume block numbers identified in a scan of the logical file block index of each snapshot. Trees of blocks associated with the files are traversed, bypassing unchanged pointers between versions and walking down to identify the changes in the hierarchy of the tree. These changes are transmitted to the destination mirror or replicated snapshot. This technique allows regular files, directories, inodes and any other hierarchical structure to be efficiently scanned to determine differences between versions thereof. The changes in the files and directories are transmitted over the network for update of the replicated destination snapshot in an asynchronous (lazy write) manner. The changes are described in an extensible, system-independent data stream format layered under a network transport protocol. At the destination, source changes are used to update the destination snapshot. Any deleted or modified inodes already on the destination are moved to a temporary or "purgatory" directory and, if reused, are relinked to the rebuilt replicated snapshot directory. The source file system snapshots can be representative of a volume sub-organization, such as a qtree.

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