公开(公告)号：US10409838B1

公开(公告)日：2019-09-10

申请号：US15074037

申请日：2016-03-18

Applicant: EMC IP Holding Company LLC

Inventor： Subin George ,  Svetlana O. Sokolova ,  Arieh Don

IPC: G06F16/27 ,  G06F16/23 ,  G06F3/06 ,  G06F11/20

Abstract: Described are techniques for maintaining and using registration and reservation information in an active-active configuration that provides automated data replication of a logical device. Various commands may be issued from one or more hosts to read and modify registration and reservation information in the active-active configuration. Processing is performed to service the various commands and provide a host or client with a consolidated logical view of a data storage system including the logical device where the host is allowed to issue I/Os over multiple paths to the logical device. Depending on the command, such processing may include replicating or mirroring reservation state information between two data storage systems each including a different device configured as the logical device.

公开(公告)号：US11095547B2

公开(公告)日：2021-08-17

申请号：US16263042

申请日：2019-01-31

Applicant: EMC IP Holding Company LLC

Inventor： Michael E. Specht ,  Vinay G. Rao ,  Subin George ,  Arieh Don

IPC: H04L12/26 ,  H04L12/707 ,  H04L12/751 ,  H04L29/08

Abstract: Combinations of host ports and storage ports (e.g., I-T pairs) on a storage network that are zoned but not masked may be determined, without accessing a switch or network administrator. Heartbeat communications (heartbeats) may be transmitted from host systems to each storage device of a storage system of which the host system is aware, along the one or more I/O paths of which the host is aware to the storage port of the I/O path. The storage devices may include one or more nominal devices defined for I-T pairs for which I/O connectivity has not been defined for any storage devices. The storage system may maintain a master heartbeat (heartbeat) table that may include a plurality of entries, each entry corresponding to a combination of a host port, storage port and storage device, and storing a time stamp value for a most recent heartbeat received for the combination.

公开(公告)号：US11050660B2

公开(公告)日：2021-06-29

申请号：US16145502

申请日：2018-09-28

Applicant: EMC IP Holding Company LLC

Inventor： Vinay G. Rao ,  Subin George ,  Scott Rowlands ,  Arieh Don

IPC: G06F15/173 ,  H04L12/707 ,  H04L12/721 ,  H04L12/803 ,  H04L29/08

Abstract: An illustrative embodiment includes a host device configured to communicate over a network with a storage system comprising a plurality of storage devices. The host device comprises a set of input-output queues and a multi-path input-output driver configured to select input-output operations from the set of input-output queues for delivery to the storage system over the network. The multi-path input-output driver is further configured to determine fabric identifiers for respective ones of a plurality of paths from the host device to the storage system, and to select particular ones of the paths for delivery of the input-output operations to the storage system based at least in part on the fabric identifiers. The fabric identifiers may be determined for the respective paths, for example, based at least in part on responses to a predetermined command sent over the paths by the multi-path input-output driver.

公开(公告)号：US10852980B1

公开(公告)日：2020-12-01

申请号：US15875097

申请日：2018-01-19

Applicant: EMC IP Holding Company LLC

Inventor： Michael E. Specht ,  Subin George ,  Arieh Don

IPC: G06F12/00 ,  G06F3/06 ,  H04L29/08

Abstract: Techniques for performing data migration may include: receiving host information regarding hosts registered on a source data storage system; issuing registration commands from a host to a target data storage system; determining, at the target data storage system in accordance with the registration commands, a host registration table including a corresponding entry for the host, the corresponding entry denoting a host name for the host and initiators of the host that sent the registration commands; and determining a masking view for the host on the target data storage system, the masking view including an initiator group of the initiators of the host that sent the registration commands to the target data storage system, wherein the masking view is used by the target data storage system to determine whether to service received I/O operations.

公开(公告)号：US10764371B2

公开(公告)日：2020-09-01

申请号：US16034625

申请日：2018-07-13

Applicant: EMC IP Holding Company LLC

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

IPC: H04L29/08 ,  H04L12/24 ,  G06F13/20 ,  G06F3/06 ,  G06F9/38

Abstract: An apparatus in one embodiment 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 set of input-output queues and a multi-path input-output driver configured to select input-output operations from the set of input-output queues for delivery to the storage system over the network. The multi-path input-output driver is further configured to generate a command comprising a cluster identifier of a cluster that includes the first host device and at least a second host device, and to send the command to the storage system over the network. The command is configured for utilization by the storage system to verify that the second host device is part of the same cluster as the first host device. The command may further comprise a group identifier for utilization by the storage system to identify the first host device of the cluster having the cluster identifier.

公开(公告)号：US10462012B1

公开(公告)日：2019-10-29

申请号：US15282066

申请日：2016-09-30

Applicant: EMC IP Holding Company LLC

Inventor： Vinay Rao ,  Xiali He ,  Subin George ,  Arieh Don

IPC: G06F15/173 ,  H04L12/24 ,  G06F3/06 ,  G06F16/21 ,  H04L29/08

Abstract: A data storage system migrates a device between a storage array and a cloud gateway based on monitored conditions such as access frequency. More particularly, both a logical volume and the associated data are migrated. The unique device ID (e.g. and without limitation the WWN or WWID) is maintained after migration so the migration is transparent to the host application. The device is deleted from the migration source after being moved to the migration target, thereby releasing resources such as memory, storage, processor cycles and bandwidth at the migration source. A multi-path IO driver in the host computer coordinates with a tiering program in the storage array and a monitoring program in the cloud gateway to manage migration of the logical volume.