Once you have determined how to configure your shadow set,
perform the following steps:
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.
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.
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.
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.
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:
You do not need to change the device
volume labels and logical names.
If you use mount command files, ensure that the
commands mount the physical devices using the appropriate naming
syntax for virtual units (DSAn:).