公开(公告)号：US20180267986A1

公开(公告)日：2018-09-20

申请号：US15615847

申请日：2017-06-07

Applicant: VMWARE, INC.

Inventor： ASIT DESAI ,  PRASANNA AITHAL ,  BRYAN BRANSTETTER ,  ROHAN PASALKAR ,  PRASAD RAO JANGAM ,  MAHESH S. HIREGOUDAR ,  PRADEEP KRISHNAMURTHY ,  SRINIVASA SHANTHARAM

IPC: G06F17/30

CPC classification number: G06F16/13 ,  G06F16/113 ,  G06F16/164

Abstract: The systems described herein are configured to enhance the efficiency of memory usage and access in a VM file system data store with respect to allocating memory in large and small file block clusters using affinity metadata and propagating and maintaining the affinity metadata in support of the described allocation. During storage of file data, an affinity identifier of the file data is determined. The affinity identifier is used to identify a large file block cluster and a small file block cluster within the identified large file block cluster. The file data is stored in the selected small file block cluster and affinity metadata of the selected small file block cluster is updated to reflect the storage of the file data.

公开(公告)号：US20230229636A1

公开(公告)日：2023-07-20

申请号：US18189979

申请日：2023-03-24

Applicant: VMware, Inc.

Inventor： MAHESH HIREGOUDAR ,  PRASANNA AITHAL ,  PRASAD RAO JANGAM ,  SRINIVASA SHANTHARAM ,  ROHAN PASALKAR ,  SRIKANTH MAHABALARAO

IPC: G06F16/178 ,  G06F16/17 ,  G06F16/188 ,  G06F16/176

CPC classification number: G06F16/178 ,  G06F16/1727 ,  G06F16/188 ,  G06F16/1774

Abstract: A method of synchronously executing input/output operations (IOs) for a plurality of applications using a storage device with a file system includes the steps of: receiving a first write IO including an instruction to write first data at a first address of the file system; determining that, within a first range of the file system comprising the first address, there are no pending unmap IOs for deallocating storage space of the storage device from files of the plurality of applications; after determining that there are no pending unmap IOs within the first range, locking the first range to prevent incoming unmap IOs from deallocating storage space within the first range from the files of the plurality of applications; after locking the first range, writing the first data to the storage device at the first address; and after writing the first data, unlocking the first range.

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

IPC: G06F12/02 ,  G06F3/06

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.

公开(公告)号：US20230089300A1

公开(公告)日：2023-03-23

申请号：US17991732

申请日：2022-11-21

Applicant: VMware, Inc.

Inventor： MAHESH HIREGOUDAR ,  PRASANNA AITHAL ,  PRASAD RAO JANGAM ,  SRINIVASA SHANTHARAM ,  ROHAN PASALKAR ,  SRIKANTH MAHABALARAO

IPC: G06F3/06

Abstract: A method of deleting a first pointer block of a plurality of pointer blocks of a file system from a storage device used by a plurality of applications, wherein the plurality of pointer blocks are each subdivided into sub-blocks, includes the steps of: determining that a first sub-block of the first pointer block is marked as being empty of any addresses of the file system at which storage space is allocated to files of the applications; determining that a second sub-block of the first pointer block has not been marked as being empty; in response to the determining that the second sub-block has not been marked as being empty, determining that the second sub-block does not contain any addresses of the file system at which storage space is allocated to the files of the applications; and deleting the first pointer block from the storage device.

公开(公告)号：US20180314632A1

公开(公告)日：2018-11-01

申请号：US15644854

申请日：2017-07-10

Applicant: VMWARE, INC.

Inventor： PRADEEP KRISHNAMURTHY ,  PRASANNA AITHAL ,  ASIT DESAI ,  BRYAN BRANSTETIER ,  MAHESH S. HIREGOUDAR ,  PRASAD RAO JANGAM ,  ROHAN PASALKAR ,  SRINIVASA SHANTHARAM ,  RAGHAVAN PICHAI

IPC: G06F12/02 ,  G06F9/455

CPC classification number: G06F12/0253 ,  G06F3/0608 ,  G06F3/0659 ,  G06F3/0665 ,  G06F3/067 ,  G06F9/45558 ,  G06F2009/45579 ,  G06F2009/45583 ,  G06F2212/702

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.

公开(公告)号：US20180253442A1

公开(公告)日：2018-09-06

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: G06F17/30 ,  G06F11/14 ,  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.

公开(公告)号：US20180239779A1

公开(公告)日：2018-08-23

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: G06F17/30

CPC classification number: G06F3/067 ,  G06F3/0608 ,  G06F3/0611 ,  G06F3/0643

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.

公开(公告)号：US20220405243A1

公开(公告)日：2022-12-22

申请号：US17403922

申请日：2021-08-17

Applicant: VMWARE, INC.

Inventor： PRASANNA AITHAL ,  SRINIVASA SHANTHARAM ,  PRASAD RAO JANGAM ,  MAHESH HIREGOUDAR ,  ROHAN PASALKAR ,  SRIKANTH MAHABALARAO

IPC: G06F16/16 ,  G06F16/18 ,  G06F16/17

Abstract: System and method for journaling metadata update transactions of file system operations use logical metadata update transactions to record metadata updates for a target file in response to file system operation requests at a file system of the system. A single physical metadata update transaction is generated by consolidating multiple logical metadata update transactions for the target file. The physical metadata update transaction is then written to a journal area of a physical storage.

公开(公告)号：US20220391240A1

公开(公告)日：2022-12-08

申请号：US17463573

申请日：2021-09-01

Applicant: VMWARE, INC.

Inventor： PRASANNA AITHAL ,  PRASAD RAO JANGAM ,  SRINIVASA SHANTHARAM ,  MAHESH HIREGOUDAR ,  ROHAN PASALKAR ,  SRIKANTH MAHABALARAO

IPC: G06F9/455 ,  G06F9/46 ,  G06F16/188 ,  G06F16/13

Abstract: An example method of handling, at a hypervisor on a host in a virtualized computing system, a write input/output (IO) operation to a file on a storage device having a virtual machine file system (VMFS) is described. The method includes: generating logical transactions for the write IO operation having updates to metadata of the VMFS for the file; estimating, for the logical transactions, common space reservations for those of the updates to common fields in the metadata for the file; estimating, for the logical transactions, exclusive space reservations for those of the updates to exclusive fields in the metadata for the file; batching the logical transactions into a physical transaction, which includes a single reservation of space in a journal of the VMFS based on the common space reservations and a reservations of space in the journal for each of the exclusive space reservations, respectively.

公开(公告)号：US20180285375A1

公开(公告)日：2018-10-04

申请号：US15666606

申请日：2017-08-02

Applicant: VMWARE, INC.

Inventor： ASIT DESAI ,  BRYAN BRANSTETTER ,  PRASANNA AlTHAL ,  PRASAD RAO JANGAM ,  MAHESH S. HIREGOUDAR ,  ROHAN PASALKAR

IPC: G06F17/30 ,  G06F12/02 ,  G06F12/1036

CPC classification number: G06F16/13 ,  G06F12/023 ,  G06F12/1036 ,  G06F16/1727 ,  G06F2212/1044 ,  G06F2212/65

Abstract: Exemplary methods, apparatuses, and systems determine whether a skip optimization process can be used to store a file in a storage space. When it is determined that the skip optimization can be performed, a file stored in the storage space can be referenced in a file metadata data structure using direct addressing of file blocks storing the file instead of through indirect addressing (e.g., pointer addresses stored in pointer blocks).