Volume Shadowing for OpenVMS

This Software Product Description (SPD) covers the HP Volume Shadowing for OpenVMS, a system-integrated product that implements RAID Level 1 (disk mirroring) to ensure high data availability on Integrity, Alpha, and VAX server systems. The software maintains redundant data across a "shadow set" of up to three disks, providing transparent data access and recovery in the event of media, device, or controller failures. The document outlines configuration options—including minicopy and host-based minimerge to improve performance during restoration—as well as strict hardware and software prerequisites for implementation. It also details the available licensing models (capacity-based vs. per-disk) and lists support for various storage technologies, including Fibre Channel and SCSI.