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SHADOW_SYS_UNIT is a system parameter that defines an integer value that contains the virtual unit number of the system disk. The default value is 0. The maximum value allowed is 9999. This parameter is effective only when the SHADOW_SYS_DISK parameter has a value of 1. This parameter should be set to the same value on all nodes booting off a particular system disk shadow set. See VSI Volume Shadowing for OpenVMS for more information about setting system parameters for volume shadowing. This parameter is available for Phase II Shadowing only.