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公开(公告)号：US20220391359A1
公开(公告)日：2022-12-08
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: G06F16/188 , G06F16/182 , G06F9/50
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.
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公开(公告)号：US11467774B2
公开(公告)日：2022-10-11
申请号：US17083945
申请日：2020-10-29
Applicant: NetApp Inc.
Inventor： Ananthan Subramanian , Kumaran Nagappan , Sriram Venketaraman , Szu-Wen Kuo , Yong Eun Cho
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.
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公开(公告)号：US11461281B2
公开(公告)日：2022-10-04
申请号：US16852584
申请日：2020-04-20
Applicant: NetApp Inc.
Inventor： Rupa Natarajan , Ananthan Subramanian
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.
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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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公开(公告)号：US20220283915A1
公开(公告)日：2022-09-08
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
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.
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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：US11416356B2
公开(公告)日：2022-08-16
申请号：US16855870
申请日：2020-04-22
Applicant: NETAPP, INC.
Inventor： Asif Imtiyaz Pathan , Parag Sarfare , Ananthan Subramanian , Szu-Wen Kuo , Santhosh Selvaraj , Nikhil Mattankot
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.
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公开(公告)号：US11409457B1
公开(公告)日：2022-08-09
申请号：US17239189
申请日：2021-04-23
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.
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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：US20220091943A1
公开(公告)日：2022-03-24
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
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.
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