公开(公告)号：US20210026650A1

公开(公告)日：2021-01-28

申请号：US16522152

申请日：2019-07-25

Applicant: EMC IP Holding Company LLC

Inventor： Vinay G. Rao ,  Sanjib Mallick ,  Stephen D. Smaldone ,  Arieh Don

IPC: G06F9/4401 ,  G06F3/06

Abstract: An apparatus comprises a host device configured to communicate over a network with a storage system comprising a plurality of storage devices. The host device is further configured to execute multiple processes that generate input-output (IO) operations for delivery to the storage system. The host device comprises a multi-path input-output (MPIO) driver configured to store for each of one or more of the storage devices information specifying one or more of the processes executing on the host device that are permitted to access that storage device, and for each of at least a subset of the IO operations, to determine the particular storage device to which the IO operation is directed, to identify the process that generated the IO operation, and to control delivery of the IO operation based at least in part on whether or not the stored information indicates that the identified process is permitted to access the particular storage device.

公开(公告)号：US10895988B2

公开(公告)日：2021-01-19

申请号：US16372928

申请日：2019-04-02

Applicant: EMC IP Holding Company LLC

Inventor： Jehuda Shemer ,  Arieh Don

IPC: G06F3/06 ,  H04L29/08 ,  H04L12/841

Abstract: A method, system, and computer program product for measuring latency in storage area networks comprising receiving a command from a node at a first time by a target in a storage area network, evaluating the command by the target, and returning a reply to the node from the target at a second time, wherein a difference between the second time and the first time is less than a time period indicative of a processing delay in the target, wherein the reply is considered a good status reply.

公开(公告)号：US20200372401A1

公开(公告)日：2020-11-26

申请号：US16420493

申请日：2019-05-23

Applicant: EMC IP Holding Company LLC

Inventor： Sanjib Mallick ,  Vinay G. Rao ,  Gopinath Marappan ,  Arieh Don

IPC: G06N20/00 ,  G06F13/40 ,  G06F13/16 ,  H04L29/08

Abstract: An apparatus comprises a host device configured to communicate over a network with a storage system. The host device comprises a multi-path input-output driver configured to control delivery of input-output operations from the host device to the storage system over selected ones of a plurality of paths through the network. The multi-path input-output driver is further configured to collect information characterizing input-output patterns for each of a plurality of different applications executing on the host device, and to provide the collected information to a machine learning system. The machine learning system utilizes the collected information to generate one or more application predictions based at least in part on analysis of observed input-output patterns. The collected information in some embodiments comprises statistical distributions of numbers of input-output operations having payload sizes falling into specified ranges over a given time period.

公开(公告)号：US10817181B2

公开(公告)日：2020-10-27

申请号：US16231694

申请日：2018-12-24

Applicant: EMC IP Holding Company LLC

Inventor： Sanjib Mallick ,  Vinay G. Rao ,  Subin George ,  Arieh Don

IPC: G06F3/06 ,  H04L12/727 ,  H04L12/707 ,  H04L29/08 ,  H04L12/931 ,  H04L12/26 ,  H04L12/875 ,  H04L12/24

Abstract: An apparatus comprises a host device configured to communicate over a network with a storage system comprising a plurality of storage devices. The host device comprises a multi-path input-output driver configured to schedule input-output operations for delivery to the storage system over the network. The multi-path input-output driver is further configured to measure latencies of respective ones of a plurality of paths from the host device to the storage system, to schedule particular ones of the input-output operations for delivery to the storage system over particular ones of the paths based at least in part on the measured latencies, and to control transmission of the particular input-output operations over the particular paths in accordance with the scheduling. The scheduling additionally or alternatively takes into account other measured parameters such as measured latencies of respective ones of a plurality of storage volumes of the storage system and/or measured payload size per operation metrics for each of at least a subset of the plurality of paths.

公开(公告)号：US10802722B2

公开(公告)日：2020-10-13

申请号：US16529844

申请日：2019-08-02

Applicant: EMC IP Holding Company LLC

Inventor： Jaeyoo Jung ,  Ramesh Doddaiah ,  Owen Martin ,  Arieh Don

IPC: G06F3/06

Abstract: Techniques for processing I/O operations may include: detecting, at a host, a sequence of I/O operations to be sent from the host to a data storage system, wherein each of the I/O operations of the sequence specifies a target address included in a first logical address subrange of a first logical device; sending, from the host, the sequence of I/O operations to a same target port of the data storage system, wherein each of the I/O operations of the sequence includes an indicator denoting whether resources used by the same target port in connection with processing said each I/O operation are to be released subsequent to completing processing of said each I/O operation; receiving the sequence of I/O operations at the same target port of the data storage system; and processing the sequence of I/O operations.

公开(公告)号：US20200320025A1

公开(公告)日：2020-10-08

申请号：US16374182

申请日：2019-04-03

Applicant: EMC IP Holding Company LLC

Inventor： Scott Rowlands ,  Erik P. Smith ,  Alan Rajapa ,  Arieh Don

IPC: G06F13/16 ,  G06F13/42 ,  G06F13/40

Abstract: Storage-based slow drain detecting and automated resolution is provided herein. A data storage system as described herein can include a memory that stores computer executable components and a processor that executes computer executable components stored in the memory. The computer executable components can include a switch query component that obtains a host transfer rate negotiated between a host device and a network switch from a host-connected port of the network switch; a comparison component that compares the host transfer rate to an array transfer rate negotiated between the network switch and a storage array; and a rate limiter component that limits a data transfer from the storage array to the host device to the host transfer rate in response to the host transfer rate being less than the array transfer rate.

公开(公告)号：US20200244513A1

公开(公告)日：2020-07-30

申请号：US16260479

申请日：2019-01-29

Applicant: EMC IP Holding Company LLC

Inventor： Michael J. Scharland ,  Jaeyoo Jung ,  Arieh Don

IPC: H04L12/24 ,  G06F11/07 ,  G06F11/34 ,  H04L29/08

Abstract: Described herein are systems and techniques for determining when excessive I/O response times are not the fault of a storage port, but rather are caused by other factors or components on a storage network, for example, over-utilization of a host port. For one or more host ports and/or storage ports, a payload idle time (PIT) may be determined for each I/O operation, the PIT being the amount of time during which a storage port is waiting for a host port to be ready to send or receive data of the respective I/O operation. It may be determined whether one or more of the PITs includes an excessive idle time (EIT), where the EIT may be an amount of the PIT that is more than a predefined acceptable amount of time. The cause of the EIT may be determined.

公开(公告)号：US10684922B2

公开(公告)日：2020-06-16

申请号：US16035185

申请日：2018-07-13

Applicant: EMC IP Holding Company LLC

Inventor： Jehuda Shemer ,  Felix Shvaiger ,  Arieh Don ,  Anton Kucherov

IPC: G06F12/00 ,  G06F11/14 ,  G06F11/16 ,  G06F3/06 ,  H03M7/30

Abstract: Systems and methods for replicating data are disclosed. Data stored in a compressed form on a source storage array or device can be read and transmitted to a destination storage array or device. The replication of data is achieved without having to decompress the data.

公开(公告)号：US10678440B2

公开(公告)日：2020-06-09

申请号：US16045889

申请日：2018-07-26

Applicant: EMC IP Holding Company LLC

Inventor： Kurumurthy Gokam ,  Arieh Don ,  Gopinath Marappan

IPC: G06F3/06

Abstract: I/O storage processing behavior is controlled on a storage system based on an application instance of an I/O request. I/O storage processing behavior may be associated with application instances on a host by creating a table or other data structure that assigns identifiers to each application instance and specifies associate behavior(s) with the application instance. The table may associate behavior to application instances based on logical groupings of application instances, which may be based on existing defined groups or other logical entities, for example, a container or VM. A host may communicate the table to a storage system, and the storage system may store information from the table. An I/O request on the host may be tagged with an ID from the table, and sent to the storage system, which controls the I/O storage processing of the I/O request according to the tagged ID.

公开(公告)号：US20200042448A1

公开(公告)日：2020-02-06

申请号：US16597969

申请日：2019-10-10

Applicant: EMC IP Holding Company LLC

Inventor： Arieh Don ,  Adnan Sahin ,  Owen Martin ,  Peter Blok ,  Philip Derbeko

IPC: G06F12/0817 ,  G06F12/084 ,  G06F12/0813

Abstract: A host server in a server cluster has a memory allocator that creates a dedicated host application data cache in storage class memory. A background routine destages host application data from the dedicated cache in accordance with a destaging plan. For example, a newly written extent may be destaged based on aging. All extents may be flushed from the dedicated cache following host server reboot. All extents associated with a particular production volume may be flushed from the dedicated cache in response to a sync message from a storage array.