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.

Abstract: An apparatus comprises a host device configured to communicate over a network with a storage system. The host device comprises a plurality of host bus adaptors, and 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 paths are associated with respective initiator-target pairs wherein each of the initiators comprises a corresponding one of the host bus adaptors and each of the targets comprises a corresponding one of a plurality of ports of the storage system. The host device monitors performance of the ports in processing input-output operations delivered thereto, detects an initiator-related condition based at least in part on the monitored performance, and automatically adjusts an assignment of one or more of the initiators to one or more of the targets based at least in part on the detected initiator-related condition.

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.

Abstract: Techniques for transmitting data may include: receiving, at a host, an initiator data transfer rate indicating a communication rate at which an initiator port of the host communicates over a first path using a communications fabric with a target port of a data storage system; receiving, at the host, a target data transfer rate indicating a communication rate at which the target port of the data storage system communicates over the first path using the communications fabric with the initiator port of the host; determining, at the host, whether the initiator data transfer rate and the target data transfer rate are different; and responsive to determining that the initiator data transfer rate and the target data transfer rate are different, performing processing that limits a rate at which data is transmitted between the initiator and target ports in accordance with the initiator and target data transfer rates.

Abstract: Single points of failure (SPoFs) may be determined for I/O connectivity on a storage network. I/O path information may be determined for a storage device, for example, as a result of a host system logging into the storage network, and may be updated in response to events on the storage network. From this determined I/O path information, one or more SPoFs between a storage device and an application layer may be determined if, for the I/O path information collectively, it is determined that there is only one of any of the path components between the storage device and the application layer. The I/O path information may be displayed in a manner that facilitates a user identifying that there is an SPoF on an I/O path between a storage device and an application layer of a host system. Based on the determination of an SPoF, an alert may be issued.

Abstract: Multiple virtual host ports corresponding to a same physical host port may be determined by or on behalf of a storage system, for example, in response to logging the one or more virtual host ports into the storage system. For one or more virtual host ports, it may be determined whether the virtual host port is connected to a same fabric port as another virtual host port, where a fabric port is a port of a fabric configured to connect to a virtual host port. If two virtual host ports are determined to be connected to a same fabric port, it may be concluded that the two virtual host ports correspond to (e.g., share) a same physical host port. One or more actions may be taken on a storage network based at least in part on a determination that two virtual host ports are sharing a same physical host port.

Abstract: A topology service may include a topology database and topology service interface used by clients to query the topology database. The topology database may describe a topology of resources of an infrastructure that may include racks of resources such as network, compute and storage resources. The topology database may be populated using discovery information returned as a result of issuing discovery requests to switches. The discovery information may identify connectivity between switches and other resources. The discovery information may be processed to determine assigned switch roles and additional derived information such as regarding instances of topological entities in the infrastructure. The derived information may identify instances of racks, rows and data centers in the infrastructure. The topology database may identify particular resources included in the different racks, rows, and data centers as well as connectivity between resources and communication capabilities of resource interfaces.

Abstract: Described are techniques for achieving service level objectives. A first service level objective for a first tenant of a data storage system may be received. The first tenant may have data stored in a first set of devices of the data storage system. The first service level objective may include a first value for a first metric. The first tenant may be located on a first host and may issue I/O operations directed to the first set of devices. A first calculated value for the first metric may be determined using one or more measured values obtained at the first host. It may be determined, using the first calculated value for the first metric, whether the first service level objective for the first tenant is violated. Responsive to determining the first service level objective for the first tenant is violated, first processing may be performed to selects a remediation action.