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docs/hardware/atlantis-storage.md

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+# Atlantis (DS1823xs+) Storage Configuration
+
+## Overview
+
+Atlantis is a Synology DS1823xs+ NAS running DSM 7.3.2. This document details the storage configuration and performance characteristics.
+
+## Hardware
+
+- **Model**: Synology DS1823xs+ (8-bay)
+- **CPU**: AMD Ryzen V1780B (4 cores)
+- **RAM**: 32GB ECC
+- **DSM Version**: 7.3.2-86009
+
+## Storage Volumes
+
+### Volume 1 - Main Storage (SATA RAID6)
+| Property | Value |
+|----------|-------|
+| Drives | 8x Seagate 16TB SATA |
+| RAID Level | RAID 6 |
+| Usable Capacity | 84 TB |
+| Filesystem | Btrfs |
+| Encryption | Yes (LUKS) |
+| Write Speed | ~77 MB/s |
+| Read Speed | ~212 MB/s |
+| Mount Point | `/volume1` |
+| Purpose | Primary data storage, media, backups |
+
+### Volume 2 - Fast Metadata (NVMe RAID1)
+| Property | Value |
+|----------|-------|
+| Drives | 2x Crucial CT1000P310SSD8 (1TB each) |
+| RAID Level | RAID 1 |
+| Usable Capacity | 885 GB |
+| Filesystem | Btrfs |
+| Write Speed | ~422 MB/s |
+| Read Speed | ~435 MB/s |
+| Mount Point | `/volume2` |
+| Purpose | Docker configs, databases, metadata |
+
+### Volume 3 - Fast Downloads (NVMe RAID1)
+| Property | Value |
+|----------|-------|
+| Drives | 2x Synology SNV5420-400G (400GB each) |
+| RAID Level | RAID 1 |
+| Usable Capacity | 348 GB |
+| Filesystem | Btrfs |
+| Write Speed | ~621 MB/s |
+| Read Speed | ~706 MB/s |
+| Mount Point | `/volume3` |
+| Purpose | SABnzbd downloads, high-I/O temporary storage |
+| Created | 2026-02-01 |
+
+## NVMe Drive Layout
+
+| Device | Model | Slot | Volume |
+|--------|-------|------|--------|
+| nvme0n1 | Synology SNV5420-400G | M.2 Drive 1-2 (built-in) | Volume 3 |
+| nvme1n1 | Synology SNV5420-400G | M.2 Drive 1-1 (built-in) | Volume 3 |
+| nvme2n1 | Crucial CT1000P310SSD8 | M.2 Drive 1 (adapter) | Volume 2 |
+| nvme3n1 | Crucial CT1000P310SSD8 | M.2 Drive 2 (adapter) | Volume 2 |
+
+## Volume 3 Creation Notes
+
+Volume 3 was created using [007revad's Synology_M2_volume script](https://github.com/007revad/Synology_M2_volume) since DSM's Storage Manager doesn't allow creating M.2 storage pools when another M.2 pool already exists.
+
+### Script used:
+```bash
+sudo ~/syno_create_m2_volume.sh
+```
+
+### Configuration selected:
+- RAID Type: RAID 1
+- Storage Pool Type: Single Volume
+- Drives: nvme0n1 + nvme1n1 (Synology SNV5420)
+- Filesystem: Btrfs
+
+### Important Notes:
+- Since these are **Synology-branded drives** (SNV5420), they should survive DSM updates without needing the Synology_HDD_db script
+- After DSM updates, verify the volume is still accessible. If not, re-run the M2_volume script
+- The SNV5420 drives are enterprise-grade with power loss protection (PLP)
+
+## SSD Cache Limitation
+
+**Warning**: The DS1823xs+ has `support_ssd_cache="no"` as a factory default, which prevents using M.2 drives as SSD cache. This appears to be a Synology policy decision for the xs+ line. Combined with the "M.2 storage pool disables all M.2 cache" limitation, SSD cache is not available on this system.
+
+## Performance Comparison
+
+| Volume | Write Speed | Read Speed | Best For |
+|--------|-------------|------------|----------|
+| Volume 1 (HDD) | 77 MB/s | 212 MB/s | Large file storage |
+| Volume 2 (Crucial NVMe) | 422 MB/s | 435 MB/s | Docker configs, databases |
+| Volume 3 (Synology NVMe) | **621 MB/s** | **706 MB/s** | Downloads, high-I/O temp |
+
+## Docker Volume Mapping Strategy
+
+```
+/volume1/data           → Media files, final storage
+/volume2/metadata/docker2 → Container configs and databases  
+/volume3/usenet         → SABnzbd downloads (fast writes)
+```
+
+The arr-suite containers (Sonarr, Radarr, etc.) are configured to:
+1. Download to `/volume3/usenet` (fast NVMe)
+2. Process/unpack on `/volume3/usenet` (fast NVMe)
+3. Move completed media to `/volume1/data/media` (large HDD storage)
+
+## Related Files
+
+- Arr Suite Compose: `Atlantis/arr-suite/docker-compose.yml`
+- This documentation: `docs/hardware/atlantis-storage.md`