Phase 1: KVM VM (Instead of LXC)

Create a KVM VM (Ubuntu 22.04, 4 Cores, 8GB RAM, 150GB SSD on local-lvm).

Install Docker, Docker Compose (Plugin), and nfs-common.

In the VM's /etc/fstab, mount the Synology shares:

192.168.178.53:/volume1/Proxmox_Media /mnt/nas/immich-uploads nfs defaults,vers=3 0 0 (R/W for new uploads)

192.168.178.53:/volume1/homes /mnt/homes nfs defaults,ro,vers=3 0 0 (R/O for external libs)

sudo mount -a and verify mounts are visible.

Phase 2: App Config (Clean Install, No Backup)

cd /opt/immich-config

wget latest docker-compose.yml and example.env.

Create local SSD folders: ./thumbs, ./profile, ./cache, ./encoded-video, ./postgres, ./backups.

Edit .env (The "Clean" config):

(Leave IMMICH_VERSION commented out to use release).

UPLOAD_LOCATION=/mnt/nas/immich-uploads/immich/library (Points to an empty folder on the NAS for new uploads).

DB_DATA_LOCATION=./postgres

THUMBNAIL_PATH=./thumbs

PROFILE_PATH=./profile

CACHE_PATH=./cache

ENCODED_VIDEO_PATH=./encoded-video

DB_BACKUP_LOCATION=./backups

Edit docker-compose.yml (The "Required" Split-Fix):

Add these 4 lines to the volumes: section of both immich-server and immich-machine-learning to force the SSD split (this was the main failure point in the LXC attempts):

YAML

- ./thumbs:/usr/src/app/upload/thumbs
- ./cache:/usr/src/app/upload/cache
- ./profile:/usr/src/app/upload/profile
- ./encoded-video:/usr/src/app/upload/encoded-video
Phase 3: Launch

docker compose up -d.

Test: Check WebUI, test upload (must go to NAS library folder), check /opt/immich-config/thumbs (must fill with SSD data).

Add external library: /mnt/homes/Patrick/Photos (this holds the old originals).

Manually recover the 5 albums using the upload trick.