公开(公告)号：WO2016040236A1

公开(公告)日：2016-03-17

申请号：PCT/US2015/048810

申请日：2015-09-08

Applicant: NETAPP, INC.

Inventor： D'SA, Janice ,  PUNDIR, Anshul ,  KRISHNAMACHARI, Srinath ,  ZHENG, Ling

IPC: G06F11/14

CPC classification number: G06F17/30156 ,  G06F11/1471 ,  G06F17/30327

Abstract: A low-overhead merge technique enables restart of a merge operation with minimal logging of state information relating to progress of the merge operation by a volume layer of a storage input/output (I/O) stack executing on one or more nodes of a cluster. The technique enables restart of the merge operation by ensuring that metadata, i.e., metadata pages, generated during the merge operation is not subject to de-duplication by providing a unique value in each metadata page that distinguishes the page, i.e., renders the page distinct or "unique", from other metadata pages in an extent store. In addition, the technique ensures that a reference count on each metadata page is a value denoting a lack of de-duplication. To that end, the extent store layer is configured to not increment the reference count for a metadata page if, during the merge operation, the page is identical (and thus subject to deduplication) to an existing metadata page in the extent store.

Abstract translation: 低开销合并技术使得能够通过在集群的一个或多个节点上执行的存储输入/输出（I / O）堆栈的卷层的最小记录关于合并操作的进展的状态信息的记录来重新启动合并操作。 。 该技术通过确保在合并操作期间生成的元数据页面不受重复数据删除的影响，从而通过在每个元数据页面中提供唯一的值来区分页面，即，使页面不同 或“唯一”，从范围存储中的其他元数据页面。 此外，该技术确保每个元数据页面上的引用计数是表示缺少重复数据删除的值。 为此，如果在合并操作期间页面与扩展存储区中的现有元数据页面相同（并因此进行重复数据删除），则扩展区存储层被配置为不递增元数据页面的引用计数。

公开(公告)号：EP3191957B1

公开(公告)日：2018-07-18

申请号：EP15771801.6

申请日：2015-09-08

Applicant: NetApp, Inc.

Inventor： D'SA, Janice ,  PUNDIR, Anshul ,  KRISHNAMACHARI, Srinath ,  ZHENG, Ling

IPC: G06F17/30 ,  G06F11/14

CPC classification number: G06F17/30156 ,  G06F11/1471 ,  G06F17/30327

Abstract: A low-overhead merge technique enables restart of a merge operation with minimal logging of state information relating to progress of the merge operation by a volume layer of a storage input/output (I/O) stack executing on one or more nodes of a cluster. The technique enables restart of the merge operation by ensuring that metadata, i.e., metadata pages, generated during the merge operation is not subject to de-duplication by providing a unique value in each metadata page that distinguishes the page, i.e., renders the page distinct or “unique”, from other metadata pages in an extent store. In addition, the technique ensures that a reference count on each metadata page is a value denoting a lack of de-duplication. To that end, the extent store layer is configured to not increment the reference count for a metadata page if, during the merge operation, the page is identical (and thus subject to deduplication) to an existing metadata page in the extent store.

公开(公告)号：EP3191957A1

公开(公告)日：2017-07-19

申请号：EP15771801.6

申请日：2015-09-08

Applicant: NetApp, Inc.

Inventor： D'SA, Janice ,  PUNDIR, Anshul ,  KRISHNAMACHARI, Srinath ,  ZHENG, Ling

IPC: G06F11/14

CPC classification number: G06F17/30156 ,  G06F11/1471 ,  G06F17/30327

Abstract: A low-overhead merge technique enables restart of a merge operation with minimal logging of state information relating to progress of the merge operation by a volume layer of a storage input/output (I/O) stack executing on one or more nodes of a cluster. The technique enables restart of the merge operation by ensuring that metadata, i.e., metadata pages, generated during the merge operation is not subject to de-duplication by providing a unique value in each metadata page that distinguishes the page, i.e., renders the page distinct or “unique”, from other metadata pages in an extent store. In addition, the technique ensures that a reference count on each metadata page is a value denoting a lack of de-duplication. To that end, the extent store layer is configured to not increment the reference count for a metadata page if, during the merge operation, the page is identical (and thus subject to deduplication) to an existing metadata page in the extent store.

Abstract translation: 低开销合并技术通过在群集的一个或多个节点上执行的存储输入/输出（I / O）堆栈的卷层，以最小的日志记录与合并操作的进度有关的状态信息来启用合并操作的重启 。 该技术通过确保在合并操作期间生成的元数据（即，元数据页面）不通过在区分该页面的每个元数据页面中提供唯一值而进行重复删除来重启合并操作，即，使得页面不同 或“唯一”，从扩展存储中的其他元数据页面。 此外，该技术确保每个元数据页面上的引用计数是表示缺少重复数据删除的值。 为此，如果在合并操作期间页面与扩展存储区中的现有元数据页面相同（并因此受到重复数据删除），则扩展存储层被配置为不增加元数据页面的引用计数。