Shared DASD hardware features are used to access all the spool and checkpoint data sets. A copy of the file queue and other status information (for example, spool space allocation maps) is written to the data set for possible warm start, as with a single CA Spool system. This information is available to all systems, one at a time, as needed.
If a Coupling Facility Structure is not used for communication, then RESERVE/RELEASE channel commands and a checkpoint lock are used to prevent simultaneous referencing and updating of information kept in the data set.
Each system in the configuration must have at least one channel path to each volume containing checkpoint or spool data sets, and these devices must be specified as shared during MVS system generation. It is recommended that each CPU in a multiprocessor configuration have a channel path to each shared volume.
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