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公开(公告)号：US11494110B2
公开(公告)日：2022-11-08
申请号：US16999897
申请日：2020-08-21
Applicant: VMware, Inc.
Inventor： Wenguang Wang , Junlong Gao , Vamsi Gunturu
Abstract: Scalable segment cleaning for log-structured file systems (LFSs) includes determining counts of segment cleaners and virtual nodes, with each virtual node being associated with a plurality of objects. Each virtual node is assigned to a selected segment cleaner. Based at least on the assignments, performing, for each virtual node, segment cleaning of the objects by the assigned segment cleaner. A portion, less than all, of the virtual nodes are reassigned to a newly selected segment cleaner based on a change of the count of the segment cleaners and/or a change of the count of the virtual nodes. Based at least on the reassignments, segment cleaning of the objects is performed, for each reassigned virtual node, by the reassigned segment cleaner. In some examples, the objects comprise virtual machine disks (VMDKs) and the segment cleaning uses a segment usage table (SUT) to track segment usage and identify segment cleaning candidates.
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公开(公告)号：US11435935B2
公开(公告)日：2022-09-06
申请号：US17100663
申请日：2020-11-20
Applicant: VMware, Inc.
Inventor： Wenguang Wang , Petr Vandrovec , Hardik Singh Negi , Junlong Gao , Vamsi Gunturu
IPC: G06F3/06
Abstract: A method for cleaning an object storage having a plurality of segments is provided. Each segment includes an identifier through which the segment is accessed. The method identifies a first segment in the plurality of segments. The first segment includes a first identifier and a first size. The method determines that a utilization ratio for the first segment is below a threshold. As a result, the method generates a second segment from the first segment, such that the second segment includes a second identifier that is the same as the first identifier and a second size that is smaller than the first size. The method then writes the second segment to the object storage.
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公开(公告)号：US11334277B2
公开(公告)日：2022-05-17
申请号：US16842649
申请日：2020-04-07
Applicant: VMware, Inc.
Inventor： Wenguang Wang , Vamsi Gunturu , Eric Knauft , Pascal Renauld
IPC: G06F3/06
Abstract: Techniques for issuing efficient writes to an erasure coded storage object in a distributed storage system are provided. In one set of embodiments, a node of the system can receive a write request for updating a logical data block of the storage object, write data/metadata for the block to a record in a data log of a metadata object of the storage object (where the metadata object is stored on a performance storage tier), place the block data in a free slot of an in-memory bank, and determine whether the in-memory bank has become full. If the in-memory bank is full, the node can further allocate a segment in a capacity object of the storage object for holding contents of the in-memory bank (where the capacity object is stored on a capacity storage tier), and write the in-memory bank contents via a full stripe write to the allocated segment.
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公开(公告)号：US20220057955A1
公开(公告)日：2022-02-24
申请号：US16999897
申请日：2020-08-21
Applicant: VMware, Inc.
Inventor： Wenguang Wang , Junlong Gao , Vamsi Gunturu
Abstract: Scalable segment cleaning for log-structured file systems (LFSs) includes determining counts of segment cleaners and virtual nodes, with each virtual node being associated with a plurality of objects. Each virtual node is assigned to a selected segment cleaner. Based at least on the assignments, performing, for each virtual node, segment cleaning of the objects by the assigned segment cleaner. A portion, less than all, of the virtual nodes are reassigned to a newly selected segment cleaner based on a change of the count of the segment cleaners and/or a change of the count of the virtual nodes. Based at least on the reassignments, segment cleaning of the objects is performed, for each reassigned virtual node, by the reassigned segment cleaner. In some examples, the objects comprise virtual machine disks (VMDKs) and the segment cleaning uses a segment usage table (SUT) to track segment usage and identify segment cleaning candidates.
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公开(公告)号：US20220012132A1
公开(公告)日：2022-01-13
申请号：US16925168
申请日：2020-07-09
Applicant: VMware, Inc.
Inventor： Wenguang Wang , Vamsi Gunturu , Eric Knauft
Abstract: Processing write requests from clients includes logging the associated data into logs corresponding to the data objects targeted by the write requests. The logs are persisted by combining log entries from each of the logs into one ore more fixed-size data blocks. The fixed-size data blocks are inserted into a data tree stored on a block-based storage device.
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Patent Agency Ranking
6.发明授权公开(公告)号：US11061594B1
公开(公告)日：2021-07-13
申请号：US16827674
申请日：2020-03-23
Applicant: VMware, Inc.
Inventor： Wenguang Wang , Vamsi Gunturu
Abstract: A method for encrypting data in one or more data blocks is provided. The method generates a fixed random tweak. The method receives first and second data blocks to write on at least one physical disk of a set of physical disks associated with a set of host machines. The method applies a fixed random tweak to data indicative of the first data block and data indicative of the second data block to generate, respectively, first and second encrypted data blocks. The method writes first and second entries to a data log in a cache, the first entry comprising a first header and the first encrypted data block and the second entry comprising a second header and the second encrypted data block. The method then writes the first and second encrypted data blocks to the at least one physical disk.
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公开(公告)号：US20230251997A1
公开(公告)日：2023-08-10
申请号：US18303478
申请日：2023-04-19
Applicant: VMware, Inc.
Inventor： Wenguang Wang , Vamsi Gunturu , Junlong Gao , Petr Vandrovec , Ilya Languev , Maxime Austruy , Ilia Sokolinski , Satish Pudi
IPC: G06F16/11 , G06F11/14 , H04L67/1097 , G06F16/27 , G06F16/20
CPC classification number: G06F16/128 , G06F11/1471 , H04L67/1097 , G06F16/273 , G06F16/20 , G06F11/1451 , G06F16/258
Abstract: Techniques for recovering metadata associated with data backed up in cloud object storage are provided. In one set of embodiments, a computer system can create a snapshot of a data set, where the snapshot includes a plurality of data blocks of the data set that have been modified since the creation of a prior snapshot of the data set. The computer system can further upload the snapshot to a cloud object storage platform of a cloud infrastructure, where the snapshot is uploaded as a plurality of log segments conforming to an object format of the cloud object storage platform, and where each log segment includes one or more data blocks in the plurality of data blocks, and a set of metadata comprising, for each of the one or more data blocks, an identifier of the data set, an identifier of the snapshot, and a logical block address (LBA) of the data block. The computer system can then communicate the set of metadata to a server component running in a cloud compute and block storage platform of the cloud infrastructure.
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公开(公告)号：US20230020366A1
公开(公告)日：2023-01-19
申请号：US17951018
申请日：2022-09-22
Applicant: VMware, Inc.
Inventor： Wenguang Wang , Vamsi Gunturu , Junlong Gao
Abstract: Techniques for using data mirroring across regions to reduce the likelihood of losing objects in a cloud object storage platform are provided. In one set of embodiments, a computer system can upload first and second copies of a data object to first and second regions of the cloud object storage platform respectively, where the first and second copies are identical. The computer system can then attempt to read the first copy of the data object from the first region. If the read attempt fails, the computer system can retrieve the second copy of the data object from the second region.
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公开(公告)号：US11544147B2
公开(公告)日：2023-01-03
申请号：US16882338
申请日：2020-05-22
Applicant: VMware, Inc.
Inventor： Wenguang Wang , Junlong Gao , Vamsi Gunturu
Abstract: Techniques for using erasure coding across multiple regions to reduce the likelihood of losing objects in a cloud object storage platform are provided. In one set of embodiments, a computer system can upload each of a plurality of data objects to each of a plurality of regions of the cloud object storage platform. The computer system can further compute a parity object based on the plurality of data objects, where the parity object encodes parity information for the plurality of data objects. The computer system can then upload the parity object to another region of the cloud object storage platform different from the plurality of regions.
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公开(公告)号：US11436102B2
公开(公告)日：2022-09-06
申请号：US16998060
申请日：2020-08-20
Applicant: VMware, Inc.
Inventor： Vamsi Gunturu , Wenguang Wang , Junlong Gao , Ilia Langouev , Petr Vandrovec , Maxime Austruy , Ilia Sokolinski , Satish Pudi
Abstract: Solutions for managing archived storage include receiving, at a first node, a snapshot comprising object data (e.g., a virtual machine disk snapshot) from a second node (e.g., a software defined data center), and storing the snapshot in a tiered structure that includes a data tier and a metadata tier. Snapshots may be used for fail-over operations and/or backups, to support disaster recovery. The data tier comprises a log-structured file system (LFS), and the metadata tier comprises a content addressable storage (CAS) identifying addresses within the LFS. The metadata tier also comprises a logical layer indicating content in the CAS. Segment cleaning of the data tier is performed using a segment usage table (SUT). Some examples include performing a fail-over operation from the second node to a third node using at least the stored snapshot for workload recovery. In some examples, the CAS comprises a log-structured merge-tree (LSM-tree).
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