公开(公告)号：US20250013614A1

公开(公告)日：2025-01-09

申请号：US18780353

申请日：2024-07-22

Applicant: NetApp, Inc.

Inventor： Ravikanth Dronamraju ,  Ananthan Subramanian ,  Daniel McCarthy ,  Christopher Cason ,  Arindam Banerjee

IPC: G06F16/188 ,  G06F9/50 ,  G06F16/182

Abstract: A distributed storage management system comprising nodes that form a cluster, a distributed block layer that spans the nodes in the cluster, and file system instances deployed on the nodes. Each file system instance comprises a data management subsystem and a storage management subsystem disaggregated from the data management subsystem. The storage management subsystem comprises a node block store that forms a portion of the distributed block layer and a storage manager that manages a key-value store and virtualized storage supporting the node block store. A file system volume hosted by the data management subsystem maps to a logical block device hosted by the virtualized storage in the storage management subsystem. The key-value store includes, for a data block of the logical block device, a key that comprises a block identifier for the logical block device and a value that comprises the data block.

公开(公告)号：US20250005003A1

公开(公告)日：2025-01-02

申请号：US18828077

申请日：2024-09-09

Applicant: NetApp, Inc.

Inventor： Ananthan Subramanian ,  Sridevi Jantli ,  Anil Paul Thoppil ,  Cheryl Marie Thompson ,  Qinghua Zheng

IPC: G06F16/215 ,  G06F16/22 ,  G06F16/23

Abstract: Techniques are provided for orphan object detection, invalid sequence number detection, and asynchronous object cleanup. A storage system may store data within one or more tiers of storage, such as a storage tier (e.g., solid state storage and disks maintained by the storage system), a remote object store (e.g., storage provided by a third party storage provider), and/or other storage tiers. Orphan objects, within the remote object store, that are no longer used by the storage system may be detected and/or deleted. When an aggregate of volumes is deleted, corresponding objects, within the remote object store, may be identified and/or deleted. Invalid sequence numbers (e.g., lost or corrupt sequence numbers locally maintained in a metafile) assigned to objects within the remote object store may be identified, deleted, and/or fixed.

公开(公告)号：US20240419363A1

公开(公告)日：2024-12-19

申请号：US18815747

申请日：2024-08-26

Applicant: NetApp, Inc.

Inventor： Ananthan Subramanian ,  Kumaran Nagappen ,  Sriram Venketaraman ,  Szu-Wen Kuo ,  Yong Eun Cho

IPC: G06F3/06

Abstract: Techniques are provided for compacting indirect blocks. For example, an object is represented as a structure comprising data blocks within which data of the object is stored and indirect blocks comprising block numbers of where the data blocks are located in storage. Block numbers within a set of indirect blocks are compacted into a compacted indirect block comprising a base block number, a count of additional block numbers after the base block number in the compacted indirect block, and a pattern of the block numbers in the compacted indirect block. The compacted indirect block is stored into memory for processing access operations to the object. Storing compacted indirect blocks into memory allows for more block numbers to be stored within memory. This improves the processing of access operations because reading the block numbers from memory is faster than loading the block numbers from disk.

公开(公告)号：US12153504B2

公开(公告)日：2024-11-26

申请号：US18089192

申请日：2022-12-27

Applicant: NetApp Inc.

Inventor： Yash Hetal Trivedi ,  Daniel McCarthy ,  Ananthan Subramanian ,  William Arthur Gutknecht ,  Kevin Daniel Varghese ,  Swaroop Vikram Choudhari ,  Abdul Basit ,  Christopher Clark Corey ,  Chad Edmund Schneider

IPC: G06F11/00 ,  G06F11/16 ,  G06F11/20

Abstract: Techniques are provided for failing over an aggregate from one file system instance to a different file system instance of a distributed scale-out storage system. The aggregate may be stored within distributed storage that is accessible to a plurality of file system instances of the distributed scale-out storage system. When the aggregate is failed over from a first file system instance to a second file system instance, the first file system instance may still have a valid read lease that allows the first file system instance to serve client I/O, directed to the aggregate, using a cache. In order to prevent the first file system instance from serving stale data from the cache before the read lease expires, state machines and a set of control data are used to ensure that the second file system instance attaches to the aggregate only after the read lease has expired.

公开(公告)号：US12141481B2

公开(公告)日：2024-11-12

申请号：US18513894

申请日：2023-11-20

Applicant: NetApp Inc.

Inventor： Ram Kesavan ,  Matthew Fontaine Curtis-Maury ,  Abdul Basit ,  Vinay Devadas ,  Ananthan Subramanian

IPC: G06F12/00 ,  G06F3/06 ,  G06F11/14

Abstract: Techniques are provided for implementing write ordering for persistent memory. A set of actions are identified for commitment to persistent memory of a node for executing an operation upon the persistent memory. An episode is created to comprise a first subset of actions of the set of actions that can be committed to the persistent memory in any order with respect to one another such that a consistent state of the persistent memory can be reconstructed in the event of a crash of the node during execution of the operation. The first subset of actions within the episode are committed to the persistent memory and further execution of the operation is blocked until the episode completes.

公开(公告)号：US12141104B2

公开(公告)日：2024-11-12

申请号：US17449760

申请日：2021-10-01

Applicant: NetApp, Inc.

Inventor： Ananthan Subramanian ,  Daniel McCarthy ,  Arindam Banerjee

IPC: G06F16/00 ,  G06F16/16 ,  G06F16/182 ,  G06F16/188 ,  H04L67/00

Abstract: A method for reducing write latency in a distributed file system. A write request that includes a volume identifier is received at a data management subsystem deployed on a node within a distributed storage system. The data management subsystem maps the volume identifier to a file system volume and maps the file system volume to a set of logical block addresses in a logical block device in a storage management subsystem deployed on the node. The storage management subsystem maps the logical block device to a metadata object for the logical block device on the node that is used to process the write request. The mapping of the file system volume to the set of logical block addresses in the logical block device enables co-locating the metadata object with the file system volume on the node, which reduces the write latency associated with processing the write request.

公开(公告)号：US12119836B2

公开(公告)日：2024-10-15

申请号：US18186657

申请日：2023-03-20

Applicant: NetApp Inc.

Inventor： Ram Kesavan ,  Matthew Fontaine Curtis-Maury ,  Abdul Basit ,  Vinay Devadas ,  Ananthan Subramanian ,  Mark Smith

IPC: H03M1/12 ,  G06F3/06 ,  G06F16/901 ,  H03M1/06

CPC classification number: H03M1/0687 ,  G06F3/0604 ,  G06F3/0653 ,  G06F3/0685 ,  G06F16/9027 ,  H03M1/0695

Abstract: Techniques are provided for compacting indirect blocks. For example, an object is represented as a structure including data blocks within which data of the object is stored and indirect blocks including block numbers of where the data blocks are located in storage. Block numbers within a set of indirect blocks are compacted into a compacted indirect block including a base block number, a count of additional block numbers after the base block number in the compacted indirect block, and a pattern of the block numbers in the compacted indirect block. The compacted indirect block is stored into memory for processing access operations to the object. Storing compacted indirect blocks into memory allows for more block numbers to be stored within memory.

公开(公告)号：US20240338128A1

公开(公告)日：2024-10-10

申请号：US18744814

申请日：2024-06-17

Applicant: NetApp, Inc.

Inventor： Bharadwaj Vellore Ramesh ,  Daniel McCarthy ,  Christopher Lee Cason ,  Ananthan Subramanian

IPC: G06F3/06

CPC classification number: G06F3/0619 ,  G06F3/064 ,  G06F3/067

Abstract: Techniques are provided for repairing a primary slice file, affected by a storage device error, by using one or more dead replica slice files. The primary slice file is used by a node of a distributed storage architecture as an indirection layer between storage containers (e.g., a volume or LUN) and physical storage where data is physically stored. To improve resiliency of the distributed storage architecture, changes to the primary slice file are replicated to replica slice files hosted by other nodes. If a replica slice file falls out of sync with the primary slice file, then the replica slice file is considered dead (out of sync) and could potentially comprise stale data. If a storage device error affects blocks storing data of the primary slice file, then the techniques provided herein can repair the primary slice file using non-stale data from one or more dead replica slice files.

公开(公告)号：US12045207B2

公开(公告)日：2024-07-23

申请号：US17449758

申请日：2021-10-01

Applicant: NetApp, Inc.

Inventor： Ravikanth Dronamraju ,  Ananthan Subramanian ,  Daniel McCarthy ,  Christopher Cason ,  Arindam Banerjee

IPC: G06F16/18 ,  G06F9/50 ,  G06F16/182 ,  G06F16/188

CPC classification number: G06F16/188 ,  G06F9/5077 ,  G06F16/182

Abstract: A distributed storage management system comprising nodes that form a cluster, a distributed block layer that spans the nodes in the cluster, and file system instances deployed on the nodes. Each file system instance comprises a data management subsystem and a storage management subsystem disaggregated from the data management subsystem. The storage management subsystem comprises a node block store that forms a portion of the distributed block layer and a storage manager that manages a key-value store and virtualized storage supporting the node block store. A file system volume hosted by the data management subsystem maps to a logical block device hosted by the virtualized storage in the storage management subsystem. The key-value store includes, for a data block of the logical block device, a key that comprises a block identifier for the logical block device and a value that comprises the data block.

公开(公告)号：US12038886B2

公开(公告)日：2024-07-16

申请号：US18359192

申请日：2023-07-26

Applicant: NetApp, Inc.

Inventor： Ravikanth Dronamraju ,  Ananthan Subramanian ,  Daniel McCarthy ,  Christopher Cason ,  Arindam Banerjee

IPC: G06F16/18 ,  G06F9/50 ,  G06F16/182 ,  G06F16/188

CPC classification number: G06F16/188 ,  G06F9/5077 ,  G06F16/182

Abstract: In various examples, data storage is managed using a distributed storage management system that is resilient. Data blocks of a logical block device may be distributed across multiple nodes in a cluster. The logical block device may correspond to a file system volume associated with a file system instance deployed on a selected node within a distributed block layer of a distributed file system. Each data block may have a location in the cluster identified by a block identifier associated with each data block. Each data block may be replicated on at least one other node in the cluster. A metadata object corresponding to a logical block device that maps to the file system volume may be replicated on at least another node in the cluster. Each data block and the metadata object may be hosted on virtualized storage that is protected using redundant array independent disks (RAID).