Patent ID: 8676748
Filing Date: 2014-03-18
Classification: G06F

Abstract:
1. A method for clearing metadata in a storage subsystem of a storage controller coupled to a host device and at least one direct access storage device (DASD), the direct access storage device configured into tracks having customer data and metadata, the method comprising: identifying one or more of a plurality of types of metadata tracks, stored on a direct access storage device in the storage subsystem, to clear, the type of metadata selected from a group consisting of a storage controller level, a logical subsystem level and a volume level; receiving a clear metadata tracks (CMT) request from a client to clear metadata tracks, the CMT request including an identification of a metadata type and an identification of one or more metadata tracks associated with the metadata type; after receipt of the CMT request, quiescing any processes active in the storage subsystem; clearing the identified metadata tracks substantially in parallel; and resuming the quiesced processes after the identified metadata tracks have been cleared.