Unspin runs a lightweight C++ daemon that monitors file accesses via fanotify on your array disks. When a file exceeds configurable access thresholds it gets promoted to your cache/NVMe pool. Features: - Event-driven promotion via fanotify (no polling or cron) - Three promotion rules: small-file first-access, large-file streaming burst, periodic open detection - Mover/rsync-aware: pauses automatically during transfers - Hot-tier fill guard, dry-run mode, exclude patterns - Stackable pause locks for backup scripts, remotely accessible via ssh - Live log viewer in the settings page