Abstract: An apparatus comprises a processing device configured to control delivery of input-output operations from a host device to a storage system over selected ones of a plurality of paths through a network. The processing device is further configured to receive first and second data outputs corresponding to a plurality of groups of the storage system, to compute first and second pluralities of checksums for respective ones of the groups based on the first and second data outputs, and to determine for the respective ones of the groups whether given ones of the second plurality of checksums differ from given ones of the first plurality of checksums. The control of delivery of the input-output operations is based at least in part on the determination. The plurality of groups each correspond to a plurality of storage devices and the second data output is received after the first data output.

Abstract: A host device is 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 (MPIO) driver configured to control delivery of input-output (IO) operations from the host device to the storage system over a plurality of paths through the network. The MPIO driver is further configured to identify whether given ones of a plurality of initiators associated with the paths comprise given ones of a plurality of virtual initiator instances, and to identify given ones of a plurality of virtual IO servers corresponding to the given ones of the virtual initiator instances. The MPIO driver is also configured to detect a failure of an IO operation over a first path, and to select a second path for retrying the IO operation based on the identification of the virtual IO servers corresponding to the virtual initiator instances.

Abstract: An apparatus in one embodiment stores a first version of an operating system data structure comprising a first identifier of a logical storage device associated with a first access protocol, and in conjunction with migration of the logical storage device from utilization of the first access protocol to utilization of a second access protocol, temporarily continues to present information from the first version of the operating system data structure in response to one or more requests relating to the logical storage device, obtains a second identifier of the logical storage device associated with the second access protocol, stores a second version of the operating system data structure comprising the second identifier of the logical storage device associated with the second access protocol, and switches from presenting information from the first version of the operating system data structure to presenting information from the second version of the operating system data structure.

Abstract: At least one processing device is configured to register a logical storage device of a storage system for a first set of paths associated with a first access protocol using a host identifier, to send a first reservation command in the first access protocol over each of the paths in the first set of paths, to register the logical storage device of the storage system for a second set of paths associated with a second access protocol using the same host identifier used in registering the logical storage device for the first set of paths, to receive an additional reservation command in the first access protocol, and responsive to receipt of the additional reservation command in the first access protocol, to translate the additional reservation command to the second access protocol, and to send the additional reservation command in the second access protocol to the storage system.

Abstract: An apparatus in one embodiment includes at least one processing device, with the at least one processing device comprising a processor and a memory coupled to the processor. The at least one processing device is configured to monitor performance of respective ones of a plurality of paths for accessing a logical storage device, and responsive to detection of at least one specified condition in the monitored performance relating to at least a subset of the paths, to switch the logical storage device from utilization of a first access protocol to utilization of a second access protocol different than the first access protocol. For example, in some embodiments, the at least one processing device is configured to switch the logical storage device from a SCSI access protocol to an NVMe access protocol, and vice versa, responsive to congestion, errors or other detected performance conditions currently impacting one of the access protocols.

Abstract: An apparatus in one embodiment comprises at least one processing device. The at least one processing device is configured to monitor performance of respective ones of a plurality of paths for accessing a logical storage device, and responsive to detection of at least one specified condition in the monitored performance relating to at least a subset of the paths, to move at least one application from a first container that utilizes a first access protocol to access the logical storage device to a second container that utilizes a second access protocol different than the first access protocol to access the logical storage device. For example, in some embodiments, the at least one processing device is configured to move an application from first container that utilizes a SCSI access protocol to a second container that utilizes an NVMe access protocol, and vice versa, responsive to detected performance issues.

Abstract: An apparatus in one embodiment stores a first version of an operating system data structure comprising a first identifier of a logical storage device associated with a first access protocol, and in conjunction with migration of the logical storage device from utilization of the first access protocol to utilization of a second access protocol, temporarily continues to present information from the first version of the operating system data structure in response to one or more requests relating to the logical storage device, obtains a second identifier of the logical storage device associated with the second access protocol, stores a second version of the operating system data structure comprising the second identifier of the logical storage device associated with the second access protocol, and switches from presenting information from the first version of the operating system data structure to presenting information from the second version of the operating system data structure.

Abstract: An apparatus comprises at least one processing device that is configured to monitor, in a multi-path layer thereof, a storage area network (SAN) through which one or more host devices access storage devices of a storage system, and responsive to at least one particular detected condition of the SAN, to generate in the multi-path layer one or more notifications for delivery to the storage system. The storage system implements one or more dynamic configuration changes relating to the SAN based at least in part on the one or more notifications generated in the multi-path layer. The multi-path layer illustratively comprises at least one multi-path input-output driver implemented in a corresponding one of the host devices and configured to control delivery of input-output operations to the storage devices of the storage system over selected ones of a plurality of paths through the SAN.

Abstract: Transferring data for a virtual machine from a source storage device to a destination storage device includes determining if either the source storage device or the destination storage device is capable of unilaterally transferring data to a storage device having only input and output capabilities. The source storage device pushes data to the destination storage device if the source storage device is capable of unilaterally transferring data to a storage device having only input and output capabilities. The destination storage device pulls data from the source storage device if the destination storage device is capable of unilaterally transferring data to a storage device having only input and output capabilities. A host computing device transfers data from the source storage device to the destination storage device in response to neither storage device being capable of unilaterally transferring data to a storage device having only input and output capabilities.

Abstract: An apparatus comprises at least one processing device that is configured to monitor, in a multi-path layer thereof, a storage area network (SAN) through which one or more host devices access storage devices of a storage system, and responsive to at least one particular detected condition of the SAN, to generate in the multi-path layer one or more notifications for delivery to the storage system. The storage system implements one or more dynamic configuration changes relating to the SAN based at least in part on the one or more notifications generated in the multi-path layer. The multi-path layer illustratively comprises at least one multi-path input-output driver implemented in a corresponding one of the host devices and configured to control delivery of input-output operations to the storage devices of the storage system over selected ones of a plurality of paths through the SAN.

Abstract: A host device is 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 (MPIO) driver configured to control delivery of input-output (IO) operations from the host device to the storage system over a plurality of paths through the network. The MPIO driver is further configured to identify whether given ones of a plurality of initiators associated with the paths comprise given ones of a plurality of virtual initiator instances, and to identify given ones of a plurality of virtual IO servers corresponding to the given ones of the virtual initiator instances. The MPIO driver is also configured to detect a failure of an IO operation over a first path, and to select a second path for retrying the IO operation based on the identification of the virtual IO servers corresponding to the virtual initiator instances.

Abstract: A host device is 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 (MPIO) driver configured to control delivery of input-output (IO) operations from the host device to the storage system over a plurality of paths through the network. The MPIO driver is further configured to identify whether given ones of a plurality of initiators associated with the paths comprise given ones of a plurality of virtual initiator instances, and to identify given ones of a plurality of physical initiator components corresponding to the given ones of the virtual initiator instances. The MPIO driver is also configured to detect a failure of an IO operation over a first path, and to select a second path for retrying the IO operation based on the identification of the physical initiator components corresponding to the virtual initiator instances.

Abstract: An apparatus comprises at least one processing device that includes a processor coupled to a memory. The processing device is configured to control delivery of input-output (IO) operations from a host device to at least one storage system over selected ones of a plurality of paths through a network, and to detect initiation of a non-disruptive upgrade of the host device. The processing device is further configured to identify, responsive to the detected initiation, one or more of the plurality of paths that will become temporarily unavailable in conjunction with the non-disruptive upgrade, and to modify path selection in the host device to avoid selecting the identified paths for at least a portion of a time period during which the non-disruptive upgrade is in progress. The processing device illustratively comprises at least a portion of the host device, including a multi-path input-output (MPIO) driver that performs at least a portion of the detection, identification and modification.

Abstract: A host device is 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 (MPIO) driver configured to control delivery of input-output (IO) operations from the host device to the storage system over a plurality of paths through the network. The MPIO driver is further configured to identify whether given ones of a plurality of initiators associated with the paths comprise given ones of a plurality of virtual initiator instances, and to identify given ones of a plurality of physical initiator components corresponding to the given ones of the virtual initiator instances. The MPIO driver is also configured to detect a failure of an IO operation over a first path, and to select a second path for retrying the IO operation based on the identification of the physical initiator components corresponding to the virtual initiator instances.

Abstract: Transferring data for a virtual machine from a source storage device to a destination storage device includes determining if either the source storage device or the destination storage device is capable of unilaterally transferring data to a storage device having only input and output capabilities. The source storage device pushes data to the destination storage device if the source storage device is capable of unilaterally transferring data to a storage device having only input and output capabilities. The destination storage device pulls data from the source storage device if the destination storage device is capable of unilaterally transferring data to a storage device having only input and output capabilities. A host computing device transfers data from the source storage device to the destination storage device in response to neither storage device being capable of unilaterally transferring data to a storage device having only input and output capabilities.

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 (MPIO) driver configured to control delivery of input-output (TO) operations to the storage system over selected ones of a plurality of paths through the network. The MPIO driver is further configured to determine mappings between ranges of logical block addresses (LBAs) of logical storage volumes and respective ones of a plurality of cache entities of the storage system, to select, for a first IO operation comprising a first set of LBAs of a first logical storage volume, a first one of the paths associated with a first one of the cache entities, and to select, for a second IO operation comprising the first set of LBAs of a second logical storage volume, a second one of the paths associated with a second one of the cache entities.

Abstract: A host device discovers one or more first protocol endpoints presented by a storage system for a first logical storage device utilizing a first access protocol, and discovers one or more second protocol endpoints presented by the storage system for a second logical storage device utilizing a second access protocol. Responsive to determining that the first and second logical storage devices have a same device identity, the host device temporarily masks the one or more second protocol endpoints in a multi-path layer of the host device from one or more applications executing on the host device. In conjunction with a switchover from the first logical storage device to the second logical storage device, the host device ends the temporary masking in the multi-path layer and enables access of the one or more applications to the second logical storage device via the one or more second protocol endpoints.

Abstract: A host device discovers one or more first protocol endpoints presented by a storage system for a first logical storage device utilizing a first access protocol, and discovers one or more second protocol endpoints presented by the storage system for a second logical storage device utilizing a second access protocol. Responsive to determining that the first and second logical storage devices have a same device identity, the host device temporarily masks the one or more second protocol endpoints in a multi-path layer of the host device from one or more applications executing on the host device. In conjunction with a switchover from the first logical storage device to the second logical storage device, the host device ends the temporary masking in the multi-path layer and enables access of the one or more applications to the second logical storage device via the one or more second protocol endpoints.

Abstract: An apparatus comprises at least one processing device comprising a processor coupled to a memory. The processing device is configured to control performance of a migration process in which a source logical storage device of a first storage system is migrated to a target logical storage device of a second storage system. In conjunction with the migration process, the processing device is further configured to update a management header of the target logical storage device to include an identifier of the target logical storage device, to store an identifier of the source logical storage device, and responsive to a read of the management header of the target logical storage device, to return the identifier of the source logical storage device in place of the identifier of the target logical storage device. Other illustrative embodiments include methods and computer program products.

Abstract: A host device is configured to communicate over a network with a storage system comprising a plurality of storage devices. The host device executes one or more 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 access for each of one or more of the storage devices a stored mapping between ranges of logical block addresses of the storage device and respective ones of a plurality of cache entities of the storage system, and for each of at least a subset of the IO operations, to identify a particular one of the cache entities based at least in part on a logical block address of the IO operation and the stored mapping, and to select a particular path for delivery of the IO operation to the storage system based at least in part on the identified cache entity.