VMS File System Internals

This document provides an in-depth look at the VMS file system internals, including the Files-11 on-disk structure, volume and file management, cache processing on single nodes, and file system operations within a VAXcluster environment. It details the XQP (Extended QIO Processor), various ACP (Ancillary Control Process) functions, serialization techniques, and how the file system maintains data integrity and synchronization across multiple nodes.