公开(公告)号：US20240126464A1

公开(公告)日：2024-04-18

申请号：US18398630

申请日：2023-12-28

Applicant: NetApp Inc.

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

IPC: G06F3/06 ,  G06F9/30 ,  G06F9/448 ,  G06F11/07

CPC classification number: G06F3/064 ,  G06F3/0619 ,  G06F3/0631 ,  G06F3/0665 ,  G06F3/0679 ,  G06F9/30189 ,  G06F9/4498 ,  G06F11/0772

Abstract: Techniques are provided for data management across a persistent memory tier and a file system tier. A block within a persistent memory tier of a node is determined to have up-to-date data compared to a corresponding block within a file system tier of the node. The corresponding block may be marked as a dirty block within the file system tier. Location information of a location of the block within the persistent memory tier is encoded into a container associated with the corresponding block. In response to receiving a read operation, the location information is obtained from the container. The up-to-date data is retrieved from the block within the persistent memory tier using the location information for processing the read operation.

公开(公告)号：US20240069743A1

公开(公告)日：2024-02-29

申请号：US17893511

申请日：2022-08-23

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：US11822821B2

公开(公告)日：2023-11-21

申请号：US17536571

申请日：2021-11-29

Applicant: NetApp Inc.

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

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

CPC classification number: G06F3/0659 ,  G06F3/067 ,  G06F3/0619 ,  G06F3/0644 ,  G06F3/0653 ,  G06F3/0683 ,  G06F11/1417 ,  G06F11/1464 ,  G06F11/1469

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：US11822520B2

公开(公告)日：2023-11-21

申请号：US17958497

申请日：2022-10-03

Applicant: NetApp Inc.

Inventor： Rupa Natarajan ,  Ananthan Subramanian

IPC: G06F16/00 ,  G06F16/18 ,  G06F16/16 ,  G06F16/22

CPC classification number: G06F16/1805 ,  G06F16/162 ,  G06F16/2246

Abstract: Techniques are provided for utilizing a log to free pages from persistent memory. A log is maintained to comprise a list of page block numbers of pages within persistent memory of a node to free. A page block number, of a page, within the log is identified for processing. A reference count, corresponding to a number of references to the page block number, is identified. In response to the reference count being greater than 1, the reference count is decremented and the page block number is removed from the log. In response to the reference count being 1, the page is freed from the persistent memory and the page block number is removed from the log.

公开(公告)号：US20230367746A1

公开(公告)日：2023-11-16

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

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

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).

公开(公告)号：US11762744B2

公开(公告)日：2023-09-19

申请号：US17751944

申请日：2022-05-24

Applicant: NETAPP, INC.

Inventor： Asif Imtiyaz Pathan ,  Parag Sarfare ,  Ananthan Subramanian ,  Szu-Wen Kuo ,  Santhosh Selvaraj ,  Nikhil Mattankot

IPC: G06F11/00 ,  G06F11/20 ,  G06F11/14 ,  G06F16/182 ,  G06F11/30 ,  G06F16/17 ,  G06F11/07

CPC classification number: G06F11/2069 ,  G06F11/0787 ,  G06F11/1435 ,  G06F11/3034 ,  G06F16/1734 ,  G06F16/1824

Abstract: Failover methods and systems for a networked storage environment are provided. In one aspect, a read request associated with a first storage object is received, during a replay of entries of a log stored in a non-volatile memory of a second storage node for a failover operation initiated in response to a failure at a first storage node. The second storage node operates as a partner node of the first storage node. The read request is processed using a filtering data structure that is generated from the log prior to the replay and identifies each log entry. The read request is processed when the log does not have an entry associated with the read request, and when the filtering data structure includes an entry associated with the read request, the requested data is located at the non-volatile memory.

公开(公告)号：US20230121460A1

公开(公告)日：2023-04-20

申请号：US18047774

申请日：2022-10-19

Applicant: NetApp, Inc.

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

IPC: G06F16/27

Abstract: Systems and methods for scaling application and/or storage system functions of a distributed storage system based on a heterogeneous resource pool are provided. According to one embodiment, the distributed storage system has a composable, service-based architecture that provides scalability, resiliency, and load balancing. The distributed storage system includes a cluster of nodes each potentially having differing capabilities in terms of processing, memory, and/or storage. The distributed storage system takes advantage of different types of nodes by selectively instating appropriate services (e.g., file and volume services and/or block and storage management services) on the nodes based on their respective capabilities. Furthermore, disaggregation of these services, facilitated by interposing a frictionless layer (e.g., in the form of one or more globally accessible logical disks) therebetween, enables independent and on-demand scaling of either or both of application and storage system functions within the cluster while making use of the heterogeneous resource pool.

公开(公告)号：US11611348B2

公开(公告)日：2023-03-21

申请号：US17364946

申请日：2021-07-01

Applicant: NetApp Inc.

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

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

Abstract: Techniques are provided for implementing a file system format for persistent memory. A node, with persistent memory, receives an operation associated with a file identifier and file system instance information. A list of file system info objects are evaluated to identify a file system info object matching the file system instance information. An inofile, identified by the file system info object as being associated with inodes of files within an instance of the file system targeted by the operation, is traversed to identify an inode matching the file identifier. If the inode has an indicator that the file is tiered into the persistent memory, then the inode it utilized to facilitate execution of the operation upon the persistent memory. Otherwise, the operation is routed to a storage file system tier for execution by a storage file system upon storage associated with the node.

公开(公告)号：US11593229B2

公开(公告)日：2023-02-28

申请号：US17030043

申请日：2020-09-23

Applicant: NETAPP, INC.

Inventor： Vikhyath Rao ,  Nikul Y. Patel ,  Ananthan Subramanian ,  Vijayabhaskar Rao Sirigineni ,  Vetrivelan Kaliyaperumal

IPC: G06F11/14 ,  G06F16/21 ,  G06F16/23 ,  G06F16/27

Abstract: Data protection methods and systems for a storage environment are provided. A first-in-first out (FIFO) structure stores a logical representation of a first storage location that retains previous data for a data container, after new data for the data container is stored at a second storage location. The FIFO structure also stores a logical representation of a file system tree structure that is stored in persistent storage, after a consistent point operation. In response to an event, the file system tree structure is selected, based on the file system tree structure being closest to a transaction. A snapshot is generated using the file system tree structure. Thereafter, the data container is restored from the snapshot or from a copy of the snapshot.

公开(公告)号：US20220398172A1

公开(公告)日：2022-12-15

申请号：US17892175

申请日：2022-08-22

Applicant: NetApp Inc.

Inventor： Ananthan Subramanian ,  Matthew Fontaine Curtis-Maury ,  Vinay Devadas

IPC: G06F11/14 ,  G06F11/07 ,  G06F12/02 ,  G06F12/0817 ,  G06F12/0882 ,  G06F11/30

Abstract: Techniques are provided for maintaining and recomputing reference counts in a persistent memory file system of a node. Primary reference counts are maintained for pages within persistent memory of the node. In response to receiving a first operation to link a page into a persistent memory file system of the persistent memory, a primary reference count of the page is incremented before linking the page into the persistent memory file system. In response to receiving a second operation to unlink the page from the persistent memory file system, the page is unlinked from the persistent memory file system before the primary reference count is decremented. Upon the node recovering from a crash, the persistent memory file system is traversed in order to update shadow reference counts for the pages with correct reference count values, which are used to overwrite the primary reference counts with the correct reference count values.