International Business Machines Corporation

William James Schoen

John Lee Brooks

Jimmy Paul Strickland

Robert M Abrams

James M Showalter

Renata Rand McFadden

David A Wise

Ahilan Rajadeva

Joshua Wilson Knight, Iii

Walter James Kincaid

Patrick Reed Tracy

Laura Margaret Bostian

Application access to locally and remotely exported file systems is coordinated to allow caching data for exported file systems accessed by remote clients. In response to a request or file system access, it is determined whether the request relates to a locally exported file system or a remotely exported file system. If the request relates to a locally exported file system, a local access routine is invoked to obtain access permissions to the locally exported file system. If the request relates to remotely exported file system, a remote access routine is invoked to communicate with a local access routine in a file server responsible for coordinating access to the remotely exported file system to obtain access permissions to the remotely exported file system.

Method, computer program product, and system for coordinating access to locally and remotely exported file systems

A method for replacing a first root file system comprising, retrieving a second root file system, mounting the second root file system on a first system in a sysplex as the sysplex root file system, replacing sysplex root mount information associated with the first root file system with sysplex root mount information associated with the mounted second root file system, updating a root on the first system to point to the mounted second root file system, invalidating the first root file system on the first system, updating a first file system to point to the mounted second root file system in the first system, updating an active process with the sysplex root mount information associated with the mounted second root file system, and unmounting the first root file system from the first system.

File replacement in shared file system

Aspects for read/write data sharing of DASD (direct access storage device) data in a cluster of multiple data processing systems are described. In a method aspect, the method includes utilizing a first system as a managing system for file data modification of at least one file system, the at least one file system including a byte file system. The method further includes controlling access by at least one second system within the cluster of multiple system to data of the at least one file system through global token management, wherein concurrent, direct DASD read/write sharing of data of the at least one file system across the cluster of multiple systems occurs.

Read/write data sharing of DASD data, including byte file system data, in a cluster of multiple data processing systems

A system and method are provided for processing filesystem commands for use in a computing system of a type in which a filesystem can be mounted multiple access modes. Responsive to a remount command, the filesystem access mode is changed from a present access mode (such as read-only) to another access mode (such as read-write) without disruption of the processes executing in the computing system.

File system remount operation with selectable access modes that saves

A method for operating a computer system includes the identification of at least one of a plurality of consoles to the operating system so as to be able to dynamically specify console attributes. Furthermore, a unique command and response token value is provided for associating commands and subsequently generated responses or messages so that they may be directed to an appropriately select set of consoles as determined by the token value and the console attributes. These facilities provide a programmable and flexible interface to a computer and its operating system environment so as to facilitate the utilization of console devices for controlling the computer complex from one or more remote locations in a consistent, protected, efficient but yet flexible manner.

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Poughkeepsie, NY, United States of America

William James Schoen