Device initiated partial system quiescing

Details Device initiated partial system quiescing Device initiated partial system quiescing

G - Physics

06

F

354/230

G06F 15/16 (2006.01) G06F 11/00 (2006.01) G06F 11/14 (2006.01) G06F 11/20 (2006.01)

Patent

CA 1299757

ABSTRACT OF THE DISCLOSURE A data processing system includes a plurality of host systems and peripheral subsystems, particularly data storage subsystems. Each of the data storage subsystems includes a plurality of control units attaching a plurality of data storage devices such as direct access storage devices (DASD) for storing data on behalf of the various host systems. Each of the control units have a separate storage path for accessing the peripheral data storage devices using dynamic pathing. The storage paths can be clustered into power clusters. Maintenance personnel acting through maintenance panels on either the control units or the peripheral data storage devices activate the subsystem to request reconfigu- ration of the subsystem from all of the host systems con- nected to the subsystem. The host systems can honor the request or reject it based upon diverse criteria. Upon each of the host systems approving the reconfiguration, the subsystem is reconfigured for maintenance purposes. Upon completion of the maintenance procedures, a second reconfig- uration request is sent to the host systems for causing quiesce devices to resume normal operations. TU986011

570926

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