Accessing a DCSS in exclusive-writable mode

Red Hat Enterprise Linux 9.2 z/VM guest

You must access a DCSS in exclusive-writable mode, for example, to create or update the DCSS.

To access a DCSS in exclusive-writable mode at least one of the following conditions must apply:
  • The DCSS fits below the maximum definable address space size of the z/VM guest virtual machine.

    For large read-only DCSS, you can use suitable guest sizes to restrict exclusive-writable access to a specific z/VM guest virtual machine with a sufficient maximum definable address space size.

  • The z/VM user directory entry for the z/VM guest virtual machine includes a NAMESAVE statement for the DCSS. See z/VM: CP Planning and Administration, SC24-6271 for more information about the NAMESAVE statement.
  • The DCSS has been defined with the LOADNSHR operand.

    See z/VM: CP Commands and Utilities Reference, SC24-6268 for information about the LOADNSHR operand.

    See DCSS options about saving DCSSs with the LOADNSHR operand or with other optional properties.