International Business Machines Corporation

Aaron Eugene Taylor

Juan A Coronado

Roger Gregory Hathorn

Dinh Hai Le

Daniel J Perkin

Christina Ann Lara

Adelaide Margaret Richards

Beth Ann Peterson

Phu Nguyen

Xavier Edgar Somoza

Justin David Suess

Richard Cunningham

Adote A Tounou

Russell Bernard Krueger

David W Sharik

A method for verifying an input/output (I/O) hardware configuration is provided. Data from an input/output data set (IOCDS) is extracted for building a verification command. The IOCDS contains hardware requirements that define at least software devices associated with a logical control unit (LCU). The verification command is processed. The verification command includes a software device address range associated with a logical control unit (LCU) of the I/O hardware. The LCU utilizes a first logical path. The software device address range utilizing the first logical path is compared with an existing software device address range utilizing at least one additional logical path. The verification command is accepted if the software device address range and the existing software device address range match.

Verification of hardware configuration

A method for verifying an input/output (I/O) hardware configuration is provided. A verification command is processed. The verification command includes a software device address range associated with a logical control unit (LCU) of the I/O hardware. The LCU utilizes a first logical path. The software device address range utilizing the first logical path is compared with an existing software device address range utilizing at least one additional logical path. The verification command is accepted if the software device address range and the existing software device address range match.

Verification of input/output hardware configuration

A host reserves a device controlled by a controller that is coupled to the host. The controller starts a first timer, in response to a completion of input/output (I/O) operations on the device by the host, wherein the host continues to reserve the device after the completion of the I/O operations. The controller sends a notification to the host after an expiry of the first timer, wherein the notification requests the host to determine whether the device should continue to be reserved by the host. The controller starts a second timer, in response to receiving an acknowledgement from the host that the notification has been received by the host, wherein reservation status of the device reserved by the host is determined by the controller on or prior to an expiry of the second timer.

Management of a reserve forever device

A method to preserve a logical communication path in a data processing system, that includes a host computer, a storage controller that comprises a first logical control unit ('LCU'), and a logical communication path that is in communication with the host computer and the first LCU, comprising deleting the first LCU and setting a first status for same. The method then configures a second LCU, and establishes a second status for same, wherein the second LCU includes all or a portion of the first LCU, but is not the same as the first LCU. The deleting, setting, configuring, and establishing are performed while maintaining the logical communication path, which is in communication with the second LCU.

Apparatus and method to preserve one or more logical communication paths in a data processing system

A method of automatic recovery from a boot device failure and an initial program load (IPL) failure of an operating system (OS) comprises: receiving and complying with a user selected option of an action upon an event of a boot device failure and an IPL failure. The user selected option may consist of taking the action of attempting an auto reboot of the server with the selected boot device and continuing the reboot attempts using the reduced priority boot devices from the bootlist until detection of a boot success, or taking no action allowing for manual user intervention.

Method to recover from a boot device failure during reboot or system IPL

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Tucson, AZ, United States of America

Aaron Eugene Taylor