HP Volume Shadowing for OpenVMS

This document describes the HP Volume Shadowing for OpenVMS product (SPD 27.29.18), a System Integrated Product (SIP) that provides RAID Level 1 storage functionality. It enables high data availability by maintaining redundant copies of data across shadow sets, ensuring system operation continues despite disk or controller failures. The software supports both Alpha and VAX families of processors running on OpenVMS versions 7.2-2, 7.3, 7.3-1, or 7.3-2. Key features include transparent host-based disk mirroring, cluster-wide support, and the 'minicopy' operation to streamline backup procedures. The document also details configuration requirements, licensing options (capacity-based or per-disk), and hardware compatibility constraints.