公开(公告)号：US09740566B2

公开(公告)日：2017-08-22

申请号：US14869340

申请日：2015-09-29

Applicant: NetApp, Inc.

Inventor： Ling Zheng ,  Long Yang ,  Kayuri H. Patel ,  Suhas Prakash ,  Jeffrey S. Kimmel ,  Anshul Pundir ,  Arun Rokade

IPC: G06F12/10 ,  G06F11/14 ,  G06F3/06

CPC classification number: G06F11/1446 ,  G06F3/0619 ,  G06F3/065 ,  G06F3/0659 ,  G06F3/067 ,  G06F3/0683 ,  G06F2201/84

Abstract: A technique efficiently creates a snapshot for a logical unit (LUN) served by a storage input/output (I/O) stack executing on a node of a cluster that organizes data as extents referenced by keys. In addition, the technique efficiently creates one or more snapshots for a group of LUNs organized as a consistency group (CG) and served by storage I/O stacks executing on a plurality of nodes of the cluster. To that end, the technique involves a plurality of indivisible operations (i.e., transactions) of a snapshot creation workflow administered by a Storage Area Network (SAN) administration layer (SAL) of the storage I/O stack in response to a snapshot create request issued by a host. The SAL administers the snapshot creation workflow by initiating a set of transactions that includes, inter alia, (i) installation of barriers for LUNs (volumes) across all nodes in the cluster that participate in snapshot creation, (ii) creation of point-in-time (PIT) markers to record those I/O requests that are included in the snapshot, and (iii) updating of records (entries) in snapshot and volume tables of a cluster database (CDB).

公开(公告)号：US20170031769A1

公开(公告)日：2017-02-02

申请号：US14869340

申请日：2015-09-29

Applicant: NetApp, Inc.

Inventor： Ling Zheng ,  Long Yang ,  Kayuri H. Patel ,  Suhas Prakash ,  Jeffrey S. Kimmel ,  Anshul Pundir ,  Arun Rokade

IPC: G06F11/14 ,  G06F3/06

CPC classification number: G06F11/1446 ,  G06F3/0619 ,  G06F3/065 ,  G06F3/0659 ,  G06F3/067 ,  G06F3/0683 ,  G06F2201/84

Abstract: A technique efficiently creates a snapshot for a logical unit (LUN) served by a storage input/output (I/O) stack executing on a node of a cluster that organizes data as extents referenced by keys. In addition, the technique efficiently creates one or more snapshots for a group of LUNs organized as a consistency group (CG) and served by storage I/O stacks executing on a plurality of nodes of the cluster. To that end, the technique involves a plurality of indivisible operations (i.e., transactions) of a snapshot creation workflow administered by a Storage Area Network (SAN) administration layer (SAL) of the storage I/O stack in response to a snapshot create request issued by a host. The SAL administers the snapshot creation workflow by initiating a set of transactions that includes, inter alia, (i) installation of barriers for LUNs (volumes) across all nodes in the cluster that participate in snapshot creation, (ii) creation of point-in-time (PIT) markers to record those I/O requests that are included in the snapshot, and (iii) updating of records (entries) in snapshot and volume tables of a cluster database (CDB).

Abstract translation: 一种技术可以有效地创建一个逻辑单元（LUN）的快照，该逻辑单元（LUN）由集群的节点上执行的存储输入/输出（I / O）堆栈提供服务，该集群将数据组织为密钥引用的扩展区。 此外，该技术有效地为被组织为一致性组（CG）并由在集群的多个节点上执行的存储I / O堆栈服务的一组LUN有效地创建一个或多个快照。 为此，该技术涉及响应于快照创建请求，由存储I / O堆栈的存储区域网络（SAN）管理层（SAL）管理的快照创建工作流的多个不可分割的操作（即事务） 由主机发出。 SAL通过启动一组事务来管理快照创建工作流，其中包括（i）在参与快照创建的集群中的所有节点上安装LUN（卷）的障碍，（ii）创建点对点 -time（PIT）标记来记录快照中包含的那些I / O请求，以及（iii）更新群集数据库（CDB）的快照和卷表中的记录（条目）。