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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
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.
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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
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.
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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.
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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.
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公开(公告)号：US20220300429A1
公开(公告)日：2022-09-22
申请号：US17750707
申请日：2022-05-23
Applicant: NetApp Inc.
Inventor： Matthew Fontaine Curtis-Maury , Vinay Devadas , Ananthan Subramanian , Ram Kesavan
IPC: G06F12/0882 , G06F12/0871 , G06F16/182 , G06F16/22 , G06F12/02
Abstract: Techniques are provided for atomic writes for persistent memory. In response to receiving a write operation, a new per-page structure with a new page block number is allocated. New data of the write operation is persisted to a new page of the persistent memory having the new page block number, and the new per-page structure is persisted to the persistent memory. If the write operation targets a hole after the new data and the new per-page structure have been persisted, then a new per-page structure identifier of the new per-page structure is inserted into a parent indirect page of a page comprising the new data. If the write operation targets old data after the new data and the new per-page structure have been persisted, then an old per-page structure of the old data is updated with the new page block number.
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Patent Agency Ranking
公开(公告)号：US11422903B2
公开(公告)日：2022-08-23
申请号：US16944001
申请日：2020-07-30
Applicant: NetApp Inc.
Inventor： Ananthan Subramanian , Matthew Fontaine Curtis-Maury , Vinay Devadas
IPC: G06F11/00 , 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.
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公开(公告)号：US11341056B2
公开(公告)日：2022-05-24
申请号：US16852589
申请日：2020-04-20
Applicant: NetApp Inc.
Inventor： Matthew Fontaine Curtis-Maury , Vinay Devadas , Ananthan Subramanian , Ram Kesavan
IPC: G06F12/0871 , G06F12/0882 , G06F16/182 , G06F16/22 , G06F12/02
Abstract: Techniques are provided for atomic writes for persistent memory. In response to receiving a write operation, a new per-page structure with a new page block number is allocated. New data of the write operation is persisted to a new page of the persistent memory having the new page block number, and the new per-page structure is persisted to the persistent memory. If the write operation targets a hole after the new data and the new per-page structure have been persisted, then a new per-page structure identifier of the new per-page structure is inserted into a parent indirect page of a page comprising the new data. If the write operation targets old data after the new data and the new per-page structure have been persisted, then an old per-page structure of the old data is updated with the new page block number.
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公开(公告)号：US11188266B2
公开(公告)日：2021-11-30
申请号：US16852580
申请日：2020-04-20
Applicant: NetApp Inc.
Inventor： Ram Kesavan , Matthew Fontaine Curtis-Maury , Abdul Basit , Vinay Devadas , Ananthan Subramanian
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.
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公开(公告)号：US12248376B2
公开(公告)日：2025-03-11
申请号：US18623387
申请日：2024-04-01
Applicant: NetApp Inc.
Inventor： Ananthan Subramanian , Matthew Fontaine Curtis-Maury , Vinay Devadas
IPC: G06F11/00 , G06F11/07 , G06F11/14 , G06F11/30 , G06F12/02 , G06F12/0817 , G06F12/0882
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.
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公开(公告)号：US20250038756A1
公开(公告)日：2025-01-30
申请号：US18914423
申请日：2024-10-14
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
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.
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