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公开(公告)号：US11429308B2
公开(公告)日：2022-08-30
申请号：US16878626
申请日：2020-05-20
Applicant: VMWARE, INC.
Inventor： Gurudutt Kumar , Pradeep Krishnamurthy , Prasanth Jose , Vivek Patidar
Abstract: The disclosure supports both trickle and burst input/output (I/O) admission rates in journaling file systems. Examples include receiving incoming data; based at least on receiving the incoming data, generating metadata for a journal entry; adding the metadata to an active metadata batch; issuing a data write to write the incoming data to a storage medium; monitoring for a first trigger comprising determining that a data write for an entry in the active metadata batch is complete; based at least on the first trigger, closing the active metadata batch; and issuing a journal write to write entries of the active metadata batch to the storage medium. A second trigger comprises determining that a batch open time exceeds a selected percentage of a moving average of data write durations. A third trigger comprises determining that a batch counter exceeds a count threshold. These triggers work together to reduce I/O latencies.
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公开(公告)号：US10599366B2
公开(公告)日：2020-03-24
申请号：US15598345
申请日：2017-05-18
Applicant: VMWARE, INC.
Inventor： Asit Desai , Prasanna Aithal , Prasad Rao Jangam , Bryan Branstetter , Mahesh S Hiregoudar , Pradeep Krishnamurthy , Rohan Pasalkar , Raghavan Pichai , Srinivasa Shantharam
IPC: G06F3/06
Abstract: A distributed file system may be configured with file blocks of a first type and file blocks of a second type, from allocation units that comprise a logical volume containing the file system. File blocks of the second type may be defined from one or more file blocks of the first type. A thick file may be instantiated with a number of allocation units totaling a size greater than or equal to a specified file size of the thick file. The allocation units may be allocated to the thick file in units of file blocks of the first type or file blocks of the second type, depending on the specified file size of the thick file.
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公开(公告)号：US20180267894A1
公开(公告)日：2018-09-20
申请号：US15672339
申请日：2017-08-09
Applicant: VMWARE, INC.
Inventor： PRASAD RAO JANGAM , Asit Desai , Prasanna Aithal , Bryan Branstetter , Mahesh S Hiregoudar , Srinivasa Shantharam , Pradeep Krishnamurthy , Raghavan Pichai , Rohan Pasalkar
CPC classification number: G06F12/0246 , G06F3/0608 , G06F3/0619 , G06F3/0641 , G06F3/0662 , G06F3/067
Abstract: The systems described herein are configured to enhance the efficiency of memory in a host file system with respect to hosted virtual file systems. In situations when the hosted virtual file systems use smaller file block sizes than the file block sizes of the host file system. During storage of a file, a file block is assigned a block address and unmapping bits. The block address and unmapping bits are stored in a pointer block or other similar data structure associated with the file. Particularly, the block address is stored in a first address block and the unmapping bits are stored in at least one additional address block located in proximity to the block address, such that the unmap granularity of the file is not limited by the fixed size of address blocks in the system.
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公开(公告)号：US11436200B2
公开(公告)日：2022-09-06
申请号：US16808417
申请日：2020-03-04
Applicant: VMWARE, INC.
Inventor： Prasanth Jose , Pradeep Krishnamurthy , Gurudutt Kumar Vyudayagiri Jagannath , Vivek Patidar
Abstract: The disclosure provides for fault tolerant parallel journaling that speeds up both input/output (I/O) operations and recovery operations. Journal entry writing may occur in parallel with data writing operations. Even if a crash occurs during a data writing operation for which the journal entry has been written, the recovery operation will correctly determine that the journal entry is not valid. Additionally, recovery operations may need to validate fewer journal entries, and yet possibly retain more valid data. Examples include: for each of a plurality of journal entries: receiving incoming data; determining a signature for the incoming data; generating the journal entry for the incoming data; writing the signature in the journal entry; and writing the journal entry and the incoming data to a storage media; and based at least on writing data to the storage media, updating an awaiting index in a journal header.
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公开(公告)号：US10740227B2
公开(公告)日：2020-08-11
申请号：US15644854
申请日：2017-07-10
Applicant: VMWARE, INC.
Inventor： Pradeep Krishnamurthy , Prasanna Aithal , Asit Desai , Bryan Branstetter , Mahesh S Hiregoudar , Prasad Rao Jangam , Rohan Pasalkar , Srinivasa Shantharam , Raghavan Pichai
Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for reclaiming one or more portions of storage resources in a computer system serving one or more virtual computing instances, where the storage resources in the computer system are organized in clusters of storage blocks. In one aspect, a method includes maintaining a respective block tracking value for each storage block that indicates whether a call to reclaim the storage block is outstanding; determining, from the block tracking values, a respective cluster priority value for each of the clusters based on a count of storage blocks in the respective cluster for which a call to reclaim is outstanding; and reclaiming a first portion of storage resources in the computer system in accordance with the cluster priority values.
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Patent Agency Ranking
公开(公告)号：US10235373B2
公开(公告)日：2019-03-19
申请号：US15630983
申请日：2017-06-23
Applicant: VMWARE, INC.
Inventor： Srinivasa Shantharam , Pradeep Krishnamurthy , Asit Desai , Prasanna Aithal , Bryan Branstetter , Prasad Rao Jangam , Mahesh S Hiregoudar , Raghavan Pichai , Vivek Patidar
IPC: G06F12/08 , G06F17/30 , G06F12/0873 , G06F9/455
Abstract: System and method for executing a file system operation for a computer system utilize a computed hash value of a file system object to access a hash block of a file system directory stored in a storage system to locate a hash slot corresponding to the computed hash value. Using at least one of a hash pointer in the hash slot and an allocation block of the file system directory, a dirent slot in a dirent block of the file system directory is located to perform an operational task on the particular dirent slot to execute the file system operation.
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公开(公告)号：US20210216508A1
公开(公告)日：2021-07-15
申请号：US16808417
申请日：2020-03-04
Applicant: VMWARE, INC.
Inventor： Prasanth Jose , Pradeep Krishnamurthy , Gurudutt Kumar Vyudayagiri Jagannath , Vivek Patidar
Abstract: The disclosure provides for fault tolerant parallel journaling that speeds up both input/output (I/O) operations and recovery operations. Journal entry writing may occur in parallel with data writing operations. Even if a crash occurs during a data writing operation for which the journal entry has been written, the recovery operation will correctly determine that the journal entry is not valid. Additionally, recovery operations may need to validate fewer journal entries, and yet possibly retain more valid data. Examples include: for each of a plurality of journal entries: receiving incoming data; determining a signature for the incoming data; generating the journal entry for the incoming data; writing the signature in the journal entry; and writing the journal entry and the incoming data to a storage media; and based at least on writing data to the storage media, updating an awaiting index in a journal header.
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公开(公告)号：US10963162B2
公开(公告)日：2021-03-30
申请号：US16268517
申请日：2019-02-06
Applicant: VMWARE, INC.
Inventor： Pradeep Krishnamurthy , Srikanth Mahabalarao
Abstract: The disclosure provides an approach for performing a write to a storage system, the write having reduced latency due to parallelism of sub-steps of the write, and due to calculating a partial rather than a full checksum. The mechanism of the write has low file corruption of files on the storage system, due to journaling of the checksum.
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公开(公告)号：US10802725B2
公开(公告)日：2020-10-13
申请号：US16412458
申请日：2019-05-15
Applicant: VMWARE, INC.
Inventor： Pradeep Krishnamurthy , Prasanna Aithal
IPC: G06F3/06
Abstract: The disclosure herein describes managing a rate of processing unmap requests for a data storage volume. Unmap requests are received from a cluster of active hosts that are associated with the data storage volume. Latency data values of each active host are then accessed. A long-term cluster latency average value is calculated based on the accessed latency data values of all active hosts over a long-term time period and a short-term cluster latency average value is calculated based on the accessed latency data values of all active hosts over a short-term time period. An unmap rate adjustment value is calculated based on a difference between the long-term cluster latency average value and the short-term cluster latency average value. The rate of processing unmap requests for the data storage volume is adjusted based on the unmap rate adjustment value and the unmap requests are performed based on the adjusted rate.
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公开(公告)号：US10664450B2
公开(公告)日：2020-05-26
申请号：US15613300
申请日：2017-06-05
Applicant: VMWARE, INC.
Inventor： Prasanna Aithal , Asit Desai , Bryan Branstetter , Pradeep Krishnamurthy , Prasad Rao Jangam
IPC: G06F11/14 , G06F16/176 , G06F9/46
Abstract: Techniques for decoupling the commit and replay of file system metadata updates in a clustered file system (CFS) are provided. In one embodiment, a CFS layer of a computer system can receive a file I/O operation from a client application, where the file I/O operation involves an update to a file system metadata resource maintained on persistent storage. In response, a journaling component of the CFS layer can execute a commit phase for committing the update to a journal on the persistent storage. The CFS layer can then return an acknowledgment to the client application indicating that the file I/O operation is complete, where the acknowledgement is returned prior to completion of a replay phase configured to propagate the update from the journal to one or more locations on the persistent storage where the file system metadata resource is actually stored.
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