Emc IP Holding Company LLC

Man Lv

Bing Liu

Colin Yong Zou

Assaf Natanzon

Yong Colin Zou

Martin Chaojun Mei

Tao Xu

Chris Zirui Liu

James Lei Ni

Wei Jun Zheng

Ried Ruifang Liu

Mengwei Jiao

Eric Yang Song

Qichao Xia

Phoebe Ningning Cheng

Kun Wang

Junping Zhao

Long Wang

Wei Lin

Wenbo Wang

Joel Vance Miller

Zhengli Yi

Sean Cheng Ye

Xiangqing Yang

Oliver Yang

Alice Cuicui Zhao

Fang You

One example method includes receiving an IO request that specifies an operation to be performed concerning a data block, determining if a policy exists for a device that made the IO request, when a policy is determined to exist for the device, comparing the IO request to the policy, recording the IO request, and passing the IO request to a disk driver regardless of whether the IO request is determined to violate the policy or not.

Detect and triage data integrity issue for virtual machine

A method and system for backing up and restoring data includes: determining, at a server storage area network (SAN) node, an LUN required for protection within a server SAN node based on communication between a backup agent and a logic unit number (LUN) agent in the server SAN node; determining a target backup device based on communication between the backup agent and respective target agent of a plurality of backup devices, the plurality of backup devices being connected with the server SAN node; and transmitting a virtual disk control command to the target backup device in response to the backup or restoration being triggered, such that data in the LUN required for protection is backed up to the target backup device or restored from the target backup device via an activated virtual disk interface of the target backup device.

Method and system for backing up and restoring data

Embodiments of the present disclosure provide a method for a storage system, a storage system and a computer program product. The method comprises determining a first drive in a drive array is temporarily unavailable. The method further comprises setting the first drive in a frozen state. The method further comprises: in response to receiving a write request for the first drive during the frozen state, pending the write request or recording the write request in a second drive in the drive array. The method further comprises: in response to receiving a read request for the first drive during the frozen state, reconstructing data to which the read request is directed through data stored in a third drive in the drive array.

Availability of a storage system

Embodiments of the present disclosure provide methods and apparatus for path selection in a storage system. The storage system includes a plurality of storage devices, each storage device being connected to a plurality of different HBA ports of a server via a plurality of paths; the method comprises: monitoring a system-wide performance metric of the storage system to obtain dynamic performance statistics; detecting a performance-related event based on the dynamic performance statistics; and selecting, from the plurality of paths, an active path for a storage device of the plurality of storage devices based on the dynamic performance statistics and a result of the detecting. With the methods or apparatus according to the embodiments of the present disclosure, performance bottleneck can be avoided or timely eliminated, load balance can be achieved, and system resources can be utilized more effectively.

Method and apparatus for path selection of storage systems

Embodiments of the present disclosure relate to a method and an apparatus for backup communication. The method comprises: detecting a failure of a management interface between a processor and a baseboard management controller; in response to detecting the failure of the management interface, performing backup communication between the processor and the baseboard management controller using a control interface, wherein the baseboard management controller can obtain a physical parameter of the processor via the control interface; and transmitting a packet between the processor and the baseboard management controller via the control interface.

Method and apparatus for backup communication

Technology for simulating a slow storage disk. The technology intercepts an input/output I/O command to be dispatched to a storage disk and simulates a slow storage disk with the storage disk by injecting a delay to the dispatch of the intercepted I/O command based on a predetermined delay injection policy.

Method and apparatus for simulating slow storage disk

Configuring virtual machines for garbage collection in a deduplication backup system executed on a server computer in a cloud computing network, by configuring at least one virtual machine (VM) of a plurality of virtual machines in a VM cluster to be data protection virtual machines (DP VMs), by enabling only read and write operations to/from the DP VMs, interconnecting a garbage collection VM (GC VM) of the VM cluster to the DP VMs, configuring the GC VM to perform only garbage collection tasks for the DP VMs, and providing data access credentials from each DP VM to the GC VM to facilitate the garbage collection tasks.

Method and system for garbage collection of data protection virtual machines in cloud computing networks

Embodiments of the present disclosure provide a method, device and computer program product for managing an input/output (I/O) stack. The method comprises obtaining metadata related to an I/O request stored in the I/O stack, the metadata at least comprising a timestamp when the I/O request is placed in the I/O stack; determining, based on the timestamp, a length of time during which the I/O request waits for processing; and in response to the length of time exceeding a threshold time length, performing a predetermined operation on the I/O request to prevent the I/O stack from being congested.

Method, device and computer program product for managing input/output stack

One example method includes detecting the occurrence of a data corruption event regarding a backup dataset created by the data protection entity, transmitting, to a data integrity check entity, a request to perform a data integrity check with respect to the backup dataset, and the backup dataset comprises a backup of an entity other than the data integrity check entity and the data protection entity, and as between the data protection entity and the data integrity check entity, no portion of the data integrity check is performed by the data protection entity, receiving, from the data integrity check entity, results of the data integrity check, and the results of the data integrity check identify a data integrity problem that resulted from the data corruption event involving the backup dataset, and taking an action, based on the results of the data integrity check, to resolve the identified data integrity problem.

Method of tracking and analyzing data integrity issues by leveraging cloud services

One example method, which may be performed by a data integrity check entity, includes receiving a request from a data protection entity to perform a data integrity check regarding a backup dataset, and the backup dataset includes a backup of an entity other than the data integrity check entity and the data protection entity, accessing an information set created by the data protection entity concerning the backup dataset, performing a data integrity check process that includes analyzing the backup dataset and information contained in the information set and, based on the analysis, identifying a data integrity problem that resulted from the data corruption event involving the backup dataset, and as between the data integrity check entity and the data protection entity, only the data integrity check entity checks the integrity of data in the backup dataset, and reporting results of the analysis of the backup dataset and the information set.

Embodiments of the present disclosure relate to a method and device for identifying a problematic component in a storage system. The method comprises determining, based on history error logs of components of the storage system, a graph indicating error information of the components, where nodes in the graph indicate the components, and edges in the graph indicate connections between the components; the method further comprises identifying, based on the graph, an error source in the components of the storage system to be the problematic component. With the method and device of the present disclosure, the error source in the storage system can be identified more accurately and effectively and user experience can be enhanced.

Method and device for identifying problematic component in storage system

Embodiments of the present disclosure provide a method and an apparatus for a virtual machine. The method implemented in a virtual machine comprises: receiving I/O requests for I/O operations on virtual disks of the virtual machine; detecting associations between the virtual disks and virtual storage devices of a virtual machine hypervisor for the virtual machine; and scheduling the I/O requests based on the associations. Embodiments of the present disclosure enable an application-aware I/O QoS in a virtual environment in an efficiently way and moving IT solutions of virtual version to different virtual platforms. The method and apparatus according to the embodiments of the present disclosure offer good flexibility and compatibility.

Method and apparatus for a virtual machine

One example method includes identifying a data block as being in a corrupted state, and calculating a value of a identifier corresponding to the data block, where the value of the identifier is based on contents of the data block. The value of the identifier is then compared with a value of another identifier that is part of a stored access record for the data block. Based on results of the comparison, the virtual machine is either identified as the cause of corruption of the data block, or the virtual machine is eliminated as being the cause of the corruption of the data block.

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Beijing, China

Man Lv