公开(公告)号：WO2016040251A1

公开(公告)日：2016-03-17

申请号：PCT/US2015/048833

申请日：2015-09-08

Applicant: NETAPP, INC.

Inventor： MUTH, John ,  MCCLANAHAN, Edward D. ,  PATEL, Dhaval ,  SWAMINATHAN, Manish

IPC: G06F3/06 ,  G06F12/02

CPC classification number: G06F3/0652 ,  G06F3/0608 ,  G06F3/061 ,  G06F3/0644 ,  G06F3/0673 ,  G06F3/0688 ,  G06F2212/7205

Abstract: An optimized segment cleaning technique is configured to efficiently clean one or more selected portions or segments of a storage array coupled to one or more nodes of a cluster. A bottom-up approach of the segment cleaning technique is configured to read all blocks of a segment to be cleaned (i.e., an "old" segment) to locate extents stored on the SSDs of the old segment and examine extent metadata to determine whether the extents are valid and, if so, relocate the valid extents to a segment being written (i.e., a "new" segment). A top-down approach of the segment cleaning technique obviates reading of the blocks of the old segment to locate the extents and, instead, examines the extent metadata to determine the valid extents of the old segment. A hybrid approach may extend the top-down approach to include only full stripe read operations needed for relocation and reconstruction of blocks as well as retrieval of valid extents from the stripes, while also avoiding any unnecessary read operations of the bottom-down approach.

Abstract translation: 经优化的段清洁技术被配置为有效地清洁耦合到群集的一个或多个节点的存储阵列的一个或多个选定部分或段。 分段清洁技术的自下而上的方法被配置为读取待清理的段的所有块（即，“旧”段））来定位存储在旧段的SSD上的区段，并检查扩展元数据以确定是否 范围是有效的，如果是，将有效范围重定位到正在写入的段（即“新”段）。 段清除技术的自上而下的方法避免了读取旧段的块以定位区段，而是检查元数据的大小以确定旧段的有效范围。 混合方法可以扩展自上而下的方法，以仅包括块的重定位和重建所需的全条带读取操作以及从条带检索有效范围，同时还避免了自下而上的方法的任何不必要的读操作。

公开(公告)号：WO2016040233A1

公开(公告)日：2016-03-17

申请号：PCT/US2015/048800

申请日：2015-09-08

Applicant: NETAPP, INC.

Inventor： PATEL, Dhaval ,  SWAMINATHAN, Manish ,  MCCLANAHAN, Edward D. ,  MUTH, John

IPC: G06F3/06 ,  G06F12/02

CPC classification number: G06F12/0253 ,  G06F3/0608 ,  G06F3/061 ,  G06F3/0619 ,  G06F3/0641 ,  G06F3/0656 ,  G06F3/0688 ,  G06F12/0246 ,  G06F2212/1016 ,  G06F2212/1024 ,  G06F2212/1044 ,  G06F2212/702 ,  G06F2212/7201 ,  G06F2212/7205

Abstract: A rate matching technique may be configured to adjust a rate of cleaning of one or more selected segments of the storage array to accommodate a variable rate of incoming workload processed by a storage input/output (I/O) stack executing on one or more nodes of a cluster. An extent store layer of the storage I/O stack may clean a segment in accordance with segment cleaning which, illustratively, may be embodied as a segment cleaning process. The rate matching technique may be implemented as a feedback control mechanism configured to adjust the segment cleaning process based on the incoming workload. Components of the feedback control mechanism may include one or more weight schedulers and various accounting data structures, e.g., counters, configured to track the progress of segment cleaning and free space usage. The counters may also be used to balance the rates of segment cleaning and incoming I/O workload, which may change depending upon an incoming I/O rate. When the incoming I/O rate changes, the rate of segment cleaning may be adjusted accordingly to ensure that rates are substantially balanced.

Abstract translation: 速率匹配技术可以被配置为调整存储阵列的一个或多个所选段的清理速率，以适应由在一个或多个节点上执行的存储输入/输出（I / O）栈处理的输入工作负载的可变速率 的集群。 存储I / O堆栈的盘区存储层可以根据段清洁来清洁段，其示例性地可以被实现为段清理过程。 速率匹配技术可以被实现为反馈控制机制，其被配置为基于输入的工作负载来调整段清除过程。 反馈控制机构的组件可以包括一个或多个权重调度器和各种会计数据结构，例如计数器，其被配置为跟踪段清洁和可用空间使用的进度。 计数器还可用于平衡段清除速率和输入I / O工作负载，这可能会根据传入的I / O速率而改变。 当进入的I / O速率变化时，可以相应地调节段清洁的速率，以确保速率基本平衡。

公开(公告)号：EP3191932A1

公开(公告)日：2017-07-19

申请号：EP15771799.2

申请日：2015-09-08

Applicant: NetApp, Inc.

Inventor： PATEL, Dhaval ,  SWAMINATHAN, Manish ,  MCCLANAHAN, Edward D. ,  MUTH, John

IPC: G06F3/06 ,  G06F12/02

CPC classification number: G06F12/0253 ,  G06F3/0608 ,  G06F3/061 ,  G06F3/0619 ,  G06F3/0641 ,  G06F3/0656 ,  G06F3/0688 ,  G06F12/0246 ,  G06F2212/1016 ,  G06F2212/1024 ,  G06F2212/1044 ,  G06F2212/702 ,  G06F2212/7201 ,  G06F2212/7205

Abstract: A rate matching technique may be configured to adjust a rate of cleaning of one or more selected segments of the storage array to accommodate a variable rate of incoming workload processed by a storage input/output (I/O) stack executing on one or more nodes of a cluster. An extent store layer of the storage I/O stack may clean a segment in accordance with segment cleaning which, illustratively, may be embodied as a segment cleaning process. The rate matching technique may be implemented as a feedback control mechanism configured to adjust the segment cleaning process based on the incoming workload. Components of the feedback control mechanism may include one or more weight schedulers and various accounting data structures, e.g., counters, configured to track the progress of segment cleaning and free space usage. The counters may also be used to balance the rates of segment cleaning and incoming I/O workload, which may change depending upon an incoming I/O rate. When the incoming I/O rate changes, the rate of segment cleaning may be adjusted accordingly to ensure that rates are substantially balanced.

Abstract translation: 速率匹配技术可以被配置为调整存储阵列的一个或多个选定分段的清理速率以适应由在一个或多个节点上执行的存储输入/输出（I / O）堆栈处理的输入工作负载的可变速率 的集群。 存储I / O堆栈的扩展存储层可以根据段清理来清理段，其说明性地可以被实现为段清理过程。 速率匹配技术可以被实现为被配置为基于传入工作负载来调整段清理过程的反馈控制机制。 反馈控制机制的组件可以包括一个或多个权重调度器和各种会计数据结构，例如计数器，其被配置为跟踪段清理和空闲空间使用的进度。 这些计数器还可用于平衡段清理和传入I / O工作负载的速率，这些工作负载可能会根据传入的I / O速率而变化。 当传入的I / O速率改变时，可以相应地调整段清理的速率以确保速率基本平衡。

公开(公告)号：EP3191931A1

公开(公告)日：2017-07-19

申请号：EP15766989.6

申请日：2015-09-08

Applicant: NetApp, Inc.

Inventor： MUTH, John ,  MCCLANAHAN, Edward D. ,  PATEL, Dhaval ,  SWAMINATHAN, Manish

IPC: G06F3/06 ,  G06F12/02

CPC classification number: G06F3/0652 ,  G06F3/0608 ,  G06F3/061 ,  G06F3/0644 ,  G06F3/0673 ,  G06F3/0688 ,  G06F2212/7205

Abstract: An optimized segment cleaning technique is configured to efficiently clean one or more selected portions or segments of a storage array coupled to one or more nodes of a cluster. A bottom-up approach of the segment cleaning technique is configured to read all blocks of a segment to be cleaned (i.e., an “old” segment) to locate extents stored on the SSDs of the old segment and examine extent metadata to determine whether the extents are valid and, if so, relocate the valid extents to a segment being written (i.e., a “new” segment). A top-down approach of the segment cleaning technique obviates reading of the blocks of the old segment to locate the extents and, instead, examines the extent metadata to determine the valid extents of the old segment. A hybrid approach may extend the top-down approach to include only full stripe read operations needed for relocation and reconstruction of blocks as well as retrieval of valid extents from the stripes, while also avoiding any unnecessary read operations of the bottom-down approach.

Abstract translation: 优化的片段清理技术被配置为有效地清理耦合到群集的一个或多个节点的存储阵列的一个或多个选定部分或片段。 段清理技术的自下而上的方法被配置为读取要清理的段的所有块（即，“旧”段）以定位存储在旧段的SSD上的区段并检查区段元数据以确定 范围是有效的，如果是，则将有效范围重定位到正在写入的段（即“新”段）。 段清除技术的自顶向下的方法是避免读取旧段的块来定位范围，而是检查范围元数据以确定旧段的有效范围。 混合方法可以扩展自顶向下的方法，只包括块的重定位和重构所需的完整条带读取操作以及从条带中检索有效范围，同时还避免任何不必要的自下而上方法的读取操作。