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SHADOW_SITE_ID is a system parameter that defines a site value which Volume Shadowing uses to determine the best device to perform reads, thereby improving performance. The system manager can now define the site value to be used for all shadow sets mounted on a system. This parameter is an arbitrary numeric value coordinated by the system manager of disaster tolerant clusters. Reads from devices that have site values matching the shadow set's site value are preferred over reads from devices with different site values. For detailed information, see the description of the $SET DEVICE/SITE in the VSI OpenVMS DCL Dictionary and VSI Volume Shadowing for OpenVMS. SHADOW_SITE_ID is a DYNAMIC parameter.