Normal CA Disk processing determines the disposition type to use for data set allocation based on the share options with which a cluster is defined. If a cluster is defined with SHAREOPTIONS (1 3), it is allocated with DISP=SHR; otherwise it is allocated with DISP=OLD. By specifying sysparm VSALOSHR with a value of Y, all allocations will be made with DISP=SHR. In addition, the user exit USERVENQ can be invoked to determine the allocation desired on the data set level.
Note: Since CA Disk does not issue ENQs for VSAM data sets, it cannot be held responsible for the integrity of a data set that was archived with a disposition type other than that which it would have selected. CA Disk relies solely on the integrity features offered by VSAM through its share options.
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