초록 ▼

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 stor

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 reconfiguration of the subsystem from all of the host systems connected top 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 13 is reconfigured for maintenance purposes. Upon completion of the maintenance procedures, a second reconfiguration request is sent to the host systems for causing quiesce devices to resume normal operations.

대표청구항 ▼

In an improved data processing system having a host system with attached peripheral subsystems, at least one of said subsystems including a plurality of addressable devices, said devices maintained by a maintenance person; the improvement including, in combination: each of said devices having a comm

In an improved data processing system having a host system with attached peripheral subsystems, at least one of said subsystems including a plurality of addressable devices, said devices maintained by a maintenance person; the improvement including, in combination: each of said devices having a command input portion for receiving manually entered input commands independently of said host system; reconfigure request means in said one subsystem being operatively coupled to said input portions for receiving at least one of said input commands and being responsive to a one of said received input commands, said input commands indicating that a given one of said devices is to be maintained in an off-line condition by said maintenance person, and for generating a quiesce request; communication means in said reconfigure request means for sending to said host system said quiesce request indicating a desired removal of said given device from those devices accessible by said host system; configuration control means in the host system having a configuration table and begin operatively coupled to said communication means for receiving said quiesce request and being responsive to said quiesce request for determining whether or not to allow such quiesce request and modifying said configuration table accordingly, thereby making the reconfiguration in the host system, when allowable, and recording same in said host system configuration table so that access to said given one of said devices may be suspended; response means in the configuration control means for generating a write system status command and for supplying same to the communication means indicating host system approval or denial of the quiesce request; and said reconfiguration request means and said communication means also responding to a second one of said received input commands for reestablishing access to said given device and to request said host system to reconfigure by modifying said configuration table accordingly.