公开(公告)号：US20240111722A1

公开(公告)日：2024-04-04

申请号：US18057384

申请日：2022-11-21

Applicant: VMware, Inc.

Inventor： Xiaohua FAN ,  Zhaohui GUO ,  Wenguang WANG ,  Kiran PATIL ,  Abhay Kumar JAIN

IPC: G06F16/16 ,  G06F16/185 ,  G06F16/188

CPC classification number: G06F16/162 ,  G06F16/185 ,  G06F16/188

Abstract: Deleting directories in a virtual distributed file system (VDFS), and non-virtual file systems, involves changing the name of a selected directory to a unique object identifier (UID) and moving the selected directory, named according to the UID, to a deletion target directory. A recursive process, implemented using a background deletion thread, starts in the current directory and identifies objects in the current directory. For an object that is a file or an empty directory, the object is added to a deletion queue. For an object that is a directory that is not empty, the recursion drops down into that directory as the new current directory. When the recursion has exhausted the selected directory, or some maximum object count has been reached, the objects identified in the deletion queue are deleted. This approach can also be used for file operations other than deletion, such as compression, encryption, and hashing.

公开(公告)号：US20240370383A1

公开(公告)日：2024-11-07

申请号：US18141995

申请日：2023-05-01

Applicant: VMware, Inc.

Inventor： Sixuan YANG ,  Yang YANG ,  Zhaohui GUO ,  Zhou HUANG ,  Jian ZHAO ,  Jianxiang ZHOU ,  Jin FENG

IPC: G06F13/10

Abstract: One example method for a host in a virtual storage area network (vSAN) cluster to support vSAN Internet small computer system interface (iSCSI) target services in a distributed storage system of a virtualization system is disclosed. The method includes obtaining ownership information of a target and determining, from the ownership information, whether the host is an owner of the target. In response to determining that the host is the owner of the target, the method further includes determining whether the host commits to a policy provided by the vSAN to support the vSAN iSCSI target services. In response to determining that the host fails to commit to the policy, the method includes reporting a warning message.

公开(公告)号：US20210081352A1

公开(公告)日：2021-03-18

申请号：US16656499

申请日：2019-10-17

Applicant: VMware, Inc.

Inventor： Yang YANG ,  Haitao ZHOU ,  Zhaohui GUO ,  Jian ZHAO ,  Zhou HUANG ,  Jin FENG

IPC: G06F15/173 ,  G06F13/16 ,  G06F13/42 ,  H04L29/08 ,  H04L29/06 ,  H04L12/879

Abstract: Certain Embodiments described herein relate to configuring the network-storage stack of two devices (e.g., physical or virtual) communicating together (e.g., an initiator and a target, as defined below) with Internet Small Computer Systems Interface (iSCSI) extension for remote direct memory access (RDMA) iSER, which is a protocol designed to utilize RDMA to accelerate iSCSI data transfer. The iSER protocol is implemented as an iSER datamover layer that acts as an interface between an iSCSI layer and an RDMA layer of the network-storage stacks of the two devices. Using iSER in conjunction with RDMA allows for bypassing the existing traditional network protocol layers (e.g., TCP/IP protocol layers) of the devices and permits data to be transferred directly, between the two devices, using certain memory buffers, thereby avoiding memory copies taking place when the existing network protocol layers are used.

公开(公告)号：US20240184610A1

公开(公告)日：2024-06-06

申请号：US18073525

申请日：2022-12-01

Applicant: VMware, Inc.

Inventor： Yang YANG ,  Sixuan YANG ,  Zhaohui GUO ,  Jian ZHAO ,  Jin FENG ,  Zhou HUANG ,  Jianxiang ZHOU

IPC: G06F9/455

CPC classification number: G06F9/45558 ,  G06F9/45545 ,  G06F2009/4557 ,  G06F2009/45583 ,  G06F2009/45591

Abstract: For a distributed storage system that has an active-active configuration for hosts and which uses an Internet small computer system interface (iSCSI) protocol, techniques are provided to identify/select a plurality of paths to a target. An active optimized path is selected for a host that is an object owner, and an active non-optimized path is selected for a host that is a component owner. The selection of the optimized path for a host is further based on whether that host has sufficient processor and memory resources to service input/output for the target. A standby path is selected for any other host that is neither an object owner or a component owner. The selected paths are provided to an initiator so as to enable the initiator to choose at least one of the paths to access the target for the input/output.

公开(公告)号：US20210224096A1

公开(公告)日：2021-07-22

申请号：US16820735

申请日：2020-03-17

Applicant: VMware, Inc.

Inventor： Haitao ZHOU ,  Yang YANG ,  Zhaohui GUO ,  Jian ZHAO ,  Zhou HUANG ,  Jin FENG

IPC: G06F9/455 ,  G06F3/06 ,  G06F13/42

Abstract: One example method to perform object-based load balancing in a distributed storage system of a virtualization system supported by a cluster of host machines may include determining, by a first host machine in the cluster, whether any host machine in the cluster has affinity to a site. The method may also include determining, by the first host machine, whether to distribute affinity Internet small computer system interface (iSCSI) targets owned by the first host machine to at least the second machine based on a first balance objective associated with the site, and after having considered the first balance objective, determining, by the first host machine, whether to distribute iSCSI targets without affinity owned by the first host machine to other host machines in the cluster based on a second balance objective associated with the cluster.

公开(公告)号：US20210109862A1

公开(公告)日：2021-04-15

申请号：US16653548

申请日：2019-10-15

Applicant: VMware, Inc.

Inventor： Yang YANG ,  Zhaohui GUO ,  Haitao ZHOU ,  Zhou HUANG ,  Jian ZHAO ,  Jin FENG

IPC: G06F12/10 ,  G06F13/16

Abstract: The disclosure herein describes enabling use of a logical unit for data storage in a distributed storage system using a plurality of backend data objects. Based on receiving instructions to create a logical unit of a logical unit size, a target backend object size to be used with the logical unit is determined, and a plurality of backend objects for allocation to the logical unit is calculated. The backend objects are allocated to the logical unit and a metadata mapping associated with the logical unit is generated. The metadata mapping associates logical block addresses of the logical unit to the allocated backend objects. The logical unit is linked with the metadata mapping in an input/output (I/O) service and, based on the linked metadata mapping, I/O traffic is routed to and from the logical unit. Using multiple backend objects enhances flexibility and efficiency of data storage on the distributed storage system.

公开(公告)号：US20190220211A1

公开(公告)日：2019-07-18

申请号：US15870506

申请日：2018-01-12

Applicant: VMware, Inc.

Inventor： Wenguang WANG ,  Eric KNAUFT ,  Srinath PREMACHANDRAN ,  Zhaohui GUO ,  Richard P. SPILLANE

IPC: G06F3/06 ,  G06F17/30 ,  G06F13/16

CPC classification number: G06F16/10 ,  G06F3/0617 ,  G06F3/0665 ,  G06F3/0667 ,  G06F3/067 ,  G06F2009/45579

Abstract: Techniques are disclosed for using in-memory replicated object to support file services. Certain embodiments provide a method of storing persistent file handles in a storage system comprising a plurality of computing devices. The method may include requesting to write a persistent file handle corresponding to a file to a file system stored on the plurality of computing devices. The request may be translated to a block input/output (I/O) command to an in-memory object, the in-memory object representing at least a portion of the file system, a copy of the in-memory object being stored at each of the plurality of computing devices in volatile memory. The persistent file handle may then be written to the copy of the in-memory object stored in the volatile memory of each of the plurality of computing devices.

公开(公告)号：US20210357126A1

公开(公告)日：2021-11-18

申请号：US17284482

申请日：2018-11-16

Applicant: VMware, Inc.

Inventor： Zhaohui GUO ,  Yang YANG ,  Haitao ZHOU ,  Zhou HUANG ,  Jin FENG

IPC: G06F3/06 ,  G06F9/455

Abstract: A method is provided for a hyper-converged storage-compute system to implement an active-active failover architecture for providing Internet Small Computer System Interface (iSCSI) target service. The method intelligently selects multiple hosts to become storage nodes that process iSCSI input/output (I/O) for a target. The method further enables iSCSI persistent reservation (PR) to handle iSCSI I/Os from multiple initiators.

公开(公告)号：US20210141728A1

公开(公告)日：2021-05-13

申请号：US16679570

申请日：2019-11-11

Applicant: VMware, Inc.

Inventor： Wenguang WANG ,  Mounesh BADIGER ,  Abhay Kumar JAIN ,  Junlong GAO ,  Zhaohui GUO ,  Richard P. SPILLANE

IPC: G06F12/0842 ,  G06F12/0844 ,  G06F12/0871 ,  G06F12/1018 ,  G06F12/14

Abstract: Disclosed are a method and system for managing multi-threaded concurrent access to a cache data structure. The cache data structure includes a hash table and three queues. The hash table includes a list of elements for each hash bucket with each hash bucket containing a mutex object and elements in each of the queues containing lock objects. Multiple threads can each lock a different hash bucket to have access to the list, and multiple threads can each lock a different element in the queues. The locks permit highly concurrent access to the cache data structure without conflict. Also, atomic operations are used to obtain pointers to elements in the queues so that a thread can safely advance each pointer. Race conditions that are encountered with locking an element in the queues or entering an element into the hash table are detected, and the operation encountering the race condition is retried.

公开(公告)号：US20210326049A1

公开(公告)日：2021-10-21

申请号：US16853623

申请日：2020-04-20

Applicant: VMware, Inc.

Inventor： Ye ZHANG ,  Wenguang WANG ,  Sriram PATIL ,  Richard P. SPILLANE ,  Junlong GAO ,  Wangping HE ,  Zhaohui GUO ,  Yang YANG

IPC: G06F3/06 ,  G06F8/658

Abstract: System and method for writing updated versions of a configuration data file for a distributed file system in a storage system uses a directory renaming operation to write a new updated version of the configuration data file using the latest version of the configuration data file and a target directory. After the latest version of the configuration data file is modified by a particular host computer in the storage system, the modified configuration data file is written to a temporary file. The directory naming operation is then initiated on the temporary file to change the directory for the temporary file to the target directory. If the directory renaming operation has failed, a retry is performed by the particular host computer to write the new updated version of the configuration data file using a new latest version and a new target directory.