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Configuration Tasks 



Once you have determined how to configure your shadow set, perform the following steps:
  1. Select which of your disk drives you want to shadow. Prepare the selected volumes for mounting by physically placing the volumes in the drives (for removable media disks). Ensure the disks are not write locked.
  2. Consider whether or not you want to initialize the volumes you have chosen to shadow. Do not initialize volumes that contain useful data.

    If you are creating a new shadow set, you can initialize one volume at a time, or multiple volumes with one command, which can streamline the creation of a shadow set (see Using INITIALIZE/SHADOW/ERASE to Streamline the Formation of a Shadow Set). When you initialize one volume at a time, you can give it a volume label that you want to use for the shadow set. When you later mount additional volumes into the shadow set, each volume will be initialized and will be given the same volume label automatically.
  3. Install the Volume Shadowing for OpenVMS licenses. See Licensing Volume Shadowing for OpenVMS for more information.
  4. Set the SHADOWING parameter to enable volume shadowing on each node that will use volume shadowing. See Volume Shadowing Parameters for more information.

    Setting the SHADOWING parameter requires that you reboot the system.
  5. Set the ALLOCLASS parameter to a nonzero value. This parameter enables the use of allocation classes in device names. You must include a nonzero allocation class in the device name of shadowed disks. For more information, see Creating a Shadow Set.
  6. Dismount the disk drives you selected for the shadow set and remount them (along with the additional shadow set disk drives) as shadow set members. Note that:

For more information on the MOUNT command, see Creating and Managing Shadow Sets Using DCL Commands.

System disks can be shadowed. All nodes booting from that system disk must have shadowing licensed and enabled.


 
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