HFS UNIX filesystems are supported in the OMVS address space itself. zFS filesystems are supported in a colony address space called ZFS. Why not support another filesystem type, allocated on the "unit record" FBA device, in another colony address space? Perhaps even a z/Linux formatted filesystem such as ext4 or btrfs. In this case the single user only allocation is a moot point since all filesystem I/O would be done by the colony address space.
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