公开(公告)号：US20210405894A1

公开(公告)日：2021-12-30

申请号：US16911425

申请日：2020-06-25

Applicant: NetApp Inc.

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

IPC: G06F3/06

Abstract: Techniques are provided for block allocation for persistent memory during aggregate transition. In a high availability pair including first and second nodes, the first node makes a determination that control of a first aggregate is to transition from the first node to the second node. A portion of available free storage space is allocated from a first persistent memory of the first node as allocated pages within the first persistent memory. Metadata information for the allocated pages is updated with an identifier of the first aggregate to create updated metadata information reserving the allocated pages for the first aggregate. The updated metadata information is mirrored to the second node, so that the second node also reserves those pages. Control of the first aggregate is transitioned to the second node. As a result, the nodes do not attempt allocating the same free pages to different aggregates during a transition.

公开(公告)号：US10552057B2

公开(公告)日：2020-02-04

申请号：US15167924

申请日：2016-05-27

Applicant: NetApp, Inc.

Inventor： Ram Kesavan ,  Ananthan Subramanian ,  Hiroshi Ishii ,  Abdul Basit ,  Joseph Brown, Jr. ,  Rohit Singh

IPC: G06F3/06

Abstract: A method, non-transitory computer readable medium and storage server computing device that determines when a generated storage operation corresponds with one of a set of predefined storage operations. The storage operation is executed and a result of the execution of the storage operation is withheld from a file system, when the determining indicates that the storage operation corresponds with one of the set of predefined storage operations. A determination is made when a consistency point operation has completed. The result of the execution of the storage operation is presented to the file system, when the determining indicates that a consistency point operation has completed. This technology reduces the number of storage operations that are required to be journaled to maintain consistency of a file system, thereby reducing the runtime resources required to facilitate the journaling and replay resource required to replay the storage operations in a journal following a recovery.

公开(公告)号：US10210056B2

公开(公告)日：2019-02-19

申请号：US15087401

申请日：2016-03-31

Applicant: NetApp, Inc.

Inventor： Ram Kesavan ,  Ananthan Subramanian ,  Aziz Gulbeden ,  Christian Compton ,  Jawahar Tadipatri ,  Bipin Tomar ,  Joseph Allen Brown, Jr.

IPC: G06F11/16 ,  G06F11/20 ,  G06F17/30 ,  G06F12/0802

Abstract: A method, non-transitory computer readable medium, and device that assists with caching filesystem metadata to a partner non-volatile random-access memory (NVRAM) includes caching metadata related to an incoming data modifying operation generated by a client computing device to at least one storage controller device in a cluster. A service interruption event that makes a data block present in the storage device of a hosting storage node inaccessible to the client computing device is determined for during the caching. The requested metadata block from the at least one NVRAM is retrieved when the service interruption event is determined. The cache is warmed using the retrieved metadata block from the at least one NVRAM.

公开(公告)号：US09612760B2

公开(公告)日：2017-04-04

申请号：US14748995

申请日：2015-06-24

Applicant: NetApp, Inc.

Inventor： Ram Kesavan ,  Mrinal K. Bhattacharjee ,  Sudhanshu Goswami

IPC: G06F3/06 ,  G06F12/0866 ,  G06F12/02 ,  G06F17/30

CPC classification number: G06F3/0619 ,  G06F3/064 ,  G06F3/0656 ,  G06F3/0665 ,  G06F3/067 ,  G06F3/0689 ,  G06F12/023 ,  G06F12/0866 ,  G06F17/30067 ,  G06F17/30132

Abstract: A modular block allocator receives a cleaner message requesting dirty buffers associated with an inode be cleaned. The modular block allocator provides at least one bucket cache comprising a plurality of buckets, wherein each bucket represents a plurality of free data blocks. The dirty buffers are cleaned by allocating the data blocks of one of the buckets to the dirty buffers. The allocated data blocks are mapped to a stripe set and when the stripe set is full, the stripe set is sent to a storage system. In one embodiment of the invention, a modular block allocator includes a front end module and a back end module communicating with each other via an application programming interface (API). The front end module contains write allocation policies that define how blocks are laid out on disk. The back end module creates data structures for execution of the policies.

公开(公告)号：US12169472B2

公开(公告)日：2024-12-17

申请号：US18361966

申请日：2023-07-31

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：US20240411645A1

公开(公告)日：2024-12-12

申请号：US18809170

申请日：2024-08-19

Applicant: NetApp, Inc.

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

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

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：US12066897B2

公开(公告)日：2024-08-20

申请号：US18302212

申请日：2023-04-18

Applicant: NetApp Inc.

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

IPC: G06F11/00 ,  G06F11/14 ,  G06F13/16 ,  G06F16/182

CPC classification number: G06F11/1435 ,  G06F13/1668 ,  G06F16/183

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：US20230336183A1

公开(公告)日：2023-10-19

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: H03M1/06 ,  G06F3/06 ,  G06F16/901

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

Abstract: Techniques are provided for implementing a file system format for persistent memory. A node, comprising persistent memory, receives an operation comprising 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 comprises 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：US11748208B2

公开(公告)日：2023-09-05

申请号：US17576981

申请日：2022-01-16

Applicant: NetApp Inc.

Inventor： Ananthan Subramanian ,  Ram Kesavan ,  Matthew Fontaine Curtis-Maury ,  Mark Smith

IPC: G06F3/06 ,  G06F11/14 ,  G06F11/20

CPC classification number: G06F11/1464 ,  G06F3/067 ,  G06F3/0619 ,  G06F3/0641 ,  G06F3/0659 ,  G06F11/1451 ,  G06F11/1453 ,  G06F11/1469 ,  G06F11/2056 ,  G06F2201/84

Abstract: Techniques are provided for implementing a persistent memory storage tier to manage persistent memory of a node. The persistent memory is managed by the persistent memory storage tier at a higher level within a storage operating system storage stack than a level at which a storage file system of the node is managed. The persistent memory storage tier intercepts an operation targeting the storage file system. The persistent memory storage tier retargets the operation from targeting the storage file system to targeting the persistent memory. The operation is transmitted to the persistent memory.

公开(公告)号：US11630733B2

公开(公告)日：2023-04-18

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: G06F11/00 ,  G06F11/14 ,  G06F13/16 ,  G06F16/182

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.