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.