If the optional CMS file‑level protection is active, CA ACF2 for VM constructs a pseudo‑DSN describing the file being accessed. When you open a file, or the first I/O occurs, CA ACF2 for VM validates the DSN. For CMS file accesses, the pseudo DSN is:
owner.Vccuu.filename.filetype
Specifies the data owner. The data owner is the VM user ID that has the MDISK statement for the minidisk. The owner field is the key to the rule.
Specifies the volume type. Minidisks are virtual volumes.
Specifies the VM directory address of the volume, for example, V0191.
Specifies the CMS filename.
Specifies the CMS filetype.
If TDISKVLD is in effect, the access rules for CMS files on T‑disks have a unique pseudo‑dsn syntax:
owner.VMTDISK.filename.filetype
Specifies the data owner. This is the user ID of the owner of the T‑disk.
Specifies a literal identifying this rule that applies to all T‑disks, regardless of virtual address.
Specifies the CMS filename.
Specifies the CMS filetype.
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