Dell Products Inc.

Mohammad Salim Akhtar

Kurumurthy Gokam

Sanjib Mallick

Vinay G Rao

Madhu Tarikere

An apparatus illustratively comprises at least one processing device that comprises a processor coupled to a memory. The at least one processing device is configured to maintain in a host device queue depth measures for respective paths over which input-output operations are delivered from the host device to a storage system, and to control path selection for delivery of additional input-output operations from the host device to the storage system based at least in part on the queue depth measures maintained for the paths. The at least one processing device may comprise at least one multi-path input-output driver of the host device, with maintaining the queue depth measures and controlling the path selection being performed at least in part by the at least one multi-path input-output driver of the host device. The multi-path input-output driver illustratively comprises a lockless polled-mode driver implemented in a user space of the host device.

Host device with adaptive load balancing utilizing high-performance drivers

An apparatus comprises at least one processing device that includes a processor coupled to a memory. The at least one processing device is configured to implement a source multi-path device between a source access device and a source logical storage device, to implement a target multi-path device between a target access device and a target logical storage device, and to initiate a data migration process to migrate data from the source logical storage device to the target logical storage device. The at least one processing device is further configured, in conjunction with the data migration process, to copy a set of paths of the source multi-path device to the target multi-path device, and to at least temporarily provide to the source access device identifying information of the source logical storage device in place of identifying information of the source multi-path device.

Spoofing of device identifiers in non-disruptive data migration

An apparatus comprises a processing device that includes a processor coupled to a memory. The processing device is configured to identify a source multi-path device in first multi-pathing software, to create a target multi-path device in second multi-pathing software different than the first multi-pathing software, to copy a set of paths of the source multi-path device to the target multi-path device, to add to the set of paths of the source multi-path device a new path to the target multi-path device, and to remove paths other than the new path from the source multi-path device. Such an arrangement illustratively provides non-disruptive switching of path selection functionality of a host device from the source multi-path device of the first multi-pathing software to the target multi-path device of the second multi-pathing software. The source and target multi-path devices illustratively utilize different storage access protocols, such as respective SCSI and NVMe access protocols.

Non-disruptive switching of multi-pathing software

An apparatus includes at least one processing device configured to obtain information characterizing which of a plurality of storage nodes of a distributed storage system stores respective ones of a plurality of different logical blocks of a logical storage volume of the distributed storage system. The at least one processing device is further configured, for each of a plurality of input-output operations directed to a particular one of the logical blocks of the logical storage volume, to identify, based at least in part on the obtained information, which of the plurality of storage nodes of the distributed storage system stores the particular logical block, to select a path to the identified storage node, and to send the input-output operation to the identified storage node over the selected path.

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Jamshedpur, India

Mohammad Salim Akhtar