Abstract: 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.

Abstract: 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.

Abstract: 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.