1. A computer apparatus to test a storage subsystem for a host processing system, the computer apparatus comprising: one or more non-transitory computer readable media; processing instructions stored on the one or more non-transitory computer readable media that, when executed by a processing system, direct the processing system to: when deploying the storage subsystem that comprises storage media, initiate a testing process to identify storage blocks in the storage media suitable for storing data for the host processing system; after initiating the testing process, iteratively identify partition availability events; in response to each partition availability event in the partition availability events, make a partition of the storage media available to the host processing system, wherein the partition comprises a collection of storage blocks identified via the testing process that are distinct from other storage blocks in partitions previously made available to the host processing system.