公开(公告)号：US11709603B2

公开(公告)日：2023-07-25

申请号：US17833046

申请日：2022-06-06

Applicant: NetApp Inc.

Inventor： Ganga Bhavani Kondapalli ,  Kevin Daniel Varghese ,  Ananthan Subramanian ,  Cheryl Marie Thompson ,  Anil Paul Thoppil

IPC: G06F3/06

CPC classification number: G06F3/0631 ,  G06F3/061 ,  G06F3/067 ,  G06F3/0665

Abstract: Techniques are provided for multi-tier write allocation. A storage system may store data within a multi-tier storage environment comprising a first storage tier (e.g., storage devices maintained by the storage system), a second storage tier (e.g., a remote object store provided by a third party storage provider), and/or other storage tiers. A determination is made that data (e.g., data of a write request received by the storage system) is to be stored within the second storage tier. The data is stored into a staging area of the first storage tier. A second storage tier location identifier, for referencing the data according to a format utilized by the second storage tier, is assigned to the data and provided to a file system hosting the data. The data is then destaged from the staging area into the second storage tier, such as within an object stored within the remote object store.

公开(公告)号：US20230139582A1

公开(公告)日：2023-05-04

申请号：US18089633

申请日：2022-12-28

Applicant: NetApp Inc.

Inventor： Ananthan Subramanian ,  Matthew Fontaine Curtis-Maury ,  Vinay Devadas ,  Bulli Venkata Rajesh Vipperla

IPC: G06F3/06 ,  G06F15/173

Abstract: Techniques are provided for forwarding operations to bypass persistent memory. A modify operation, targeting an object, may be received at a persistent memory tier of a node. If a forwarding policy indicates that forwarding is not enabled for the modify operation and the target object, then the modify operation is executed through a persistent memory file system. If the forwarding policy indicates that forwarding is enabled for the modify operation and the target object, then the modify operation is forwarded to a file system tier as a forwarded operation for execution through a storage file system.

公开(公告)号：US11544007B2

公开(公告)日：2023-01-03

申请号：US17216869

申请日：2021-03-30

Applicant: NetApp Inc.

Inventor： Ananthan Subramanian ,  Matthew Fontaine Curtis-Maury ,  Vinay Devadas ,  Bulli Venkata Rajesh Vipperla

IPC: G06F12/00 ,  G06F3/06 ,  G06F15/173

Abstract: Techniques are provided for forwarding operations to bypass persistent memory. A modify operation, targeting an object, may be received at a persistent memory tier of a node. If a forwarding policy indicates that forwarding is not enabled for the modify operation and the target object, then the modify operation is executed through a persistent memory file system. If the forwarding policy indicates that forwarding is enabled for the modify operation and the target object, then the modify operation is forwarded to a file system tier as a forwarded operation for execution through a storage file system.

公开(公告)号：US11487723B2

公开(公告)日：2022-11-01

申请号：US16751766

申请日：2020-01-24

Applicant: NetApp Inc.

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

IPC: G06F16/00 ,  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：US20220342577A1

公开(公告)日：2022-10-27

申请号：US17849290

申请日：2022-06-24

Applicant: NetApp, Inc.

Inventor： Kevin Daniel Varghese ,  Ananthan Subramanian ,  Parag Sarfare ,  Sandeep Yadav ,  Suhas Urkude ,  Rajesh Khandelwal

IPC: G06F3/06

Abstract: A method and system for co-locating journaling and data storage based on write requests. A write request that includes metadata and data is received from a client. A logical storage unit for storing the metadata and the data is identified. The logical storage unit is divided into a journal partition and a volume partition. The journal partition includes a first log and a second log. Which of the first log and the second log is an active log and which of the first log and the second log is an inactive log are identified. The metadata is recorded in a first location in the active log and the data is recorded in a second location in the active log during a single I/O operation. A reply is sent to the client after the metadata and the data are recorded in the journal partition.

公开(公告)号：US20220318188A1

公开(公告)日：2022-10-06

申请号：US17216940

申请日：2021-03-30

Applicant: NetApp Inc.

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

IPC: G06F16/11

Abstract: Techniques are provided for coordinating snapshot operations across multiple file systems. A notification may be received that a snapshot of data stored across a persistent memory file system and a storage file system is to be generated. Forwarding, of modify operations from a persistent memory tier to a file system tier for execution through the storage file system, may be enabled. Framing may be initiated to notify the storage file system of blocks within the persistent memory file system that comprise more up-to-date data than corresponding blocks within the storage file system. In response to the framing completing, a consistency point operation is performed to create the snapshot and to create a snapshot image as part of the snapshot.

公开(公告)号：US20220083422A1

公开(公告)日：2022-03-17

申请号：US17018176

申请日：2020-09-11

Applicant: NetApp Inc.

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

IPC: G06F11/14 ,  G06F16/182 ,  G06F13/16

Abstract: Techniques are provided for persistent memory file system reconciliation. As part of the persistent memory file system reconciliation, high level file system metadata associated with a persistent memory file system of persistent memory is reconciled. Client access to the persistent memory file system is inaccessible until reconciliation of the high level file system metadata has completed. A first scanner is executed to traverse pages of the persistent memory in order to fix local inconsistencies associated with the pages. A local inconsistency of a first set of metadata or data of a page is fixed using a second set of metadata or data of the page. The first scanner is executed asynchronously in parallel with processing client I/O directed to the persistent memory file system.

公开(公告)号：US20220083279A1

公开(公告)日：2022-03-17

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: 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：US20220035717A1

公开(公告)日：2022-02-03

申请号：US16944001

申请日：2020-07-30

Applicant: NetApp Inc.

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

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

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.

公开(公告)号：US11216350B2

公开(公告)日：2022-01-04

申请号：US16855853

申请日：2020-04-22

Applicant: NETAPP, INC.

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

IPC: G06F11/20 ,  H04L29/08 ,  H04L12/879 ,  H04L12/24

Abstract: Failover methods and systems for a networked storage environment are provided. A metadata data structure is generated, before starting a replay of entries at a log stored in a non-volatile memory of a second storage node, during 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, and the metadata structure stores a metadata attribute of each log entry. Furthermore, the metadata attribute of each log entry is persistently stored. The persistently stored metadata attribute is used to respond to a read request received during the replay by the second storage node, while a write request metadata attribute of a write request is used for executing the write request received by the second storage node during the replay.