Add Caddy reverse proxy configuration and Kopia backup documentation
- Create INFRASTRUCTURE-COMPLETE.md: Comprehensive infrastructure overview * Network architecture and DNS configuration * Storage architecture for Nextcloud (1.4TB warm storage via LVM) * Kopia backup setup with Backblaze B2 integration * Caddy reverse proxy configuration (CT 202) * Security configuration and capacity planning - Add Caddy reverse proxy configurations: * caddy-kopia-integration.md: Integration steps for CT 202 * caddy-kopia-reverse-proxy.md: Complete configuration reference * caddy/Caddyfile: Production-ready configuration * caddy/docker-compose.yml: Docker deployment spec - Add Kopia backup documentation: * kopia-nextcloud-backblaze-setup.md: Complete Kopia setup guide * Backup strategy, retention policies, and restore procedures - Update related documentation with consolidated references Status: Infrastructure documented and ready for deployment
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# ✅ Nextcloud Warm Storage - FINAL EXPANSION TO 1.4TB
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**Date**: April 27, 2026
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**Status**: ✅ COMPLETE AND OPERATIONAL
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**Final Size**: 1.4TB (1.3TB available for backups)
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---
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## 📊 Final Summary
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| Metric | Before | Final | Status |
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|--------|--------|-------|--------|
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| **Warm Storage Size** | 900GB | 1.4TB | ✅ +555% |
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| **Available Space** | 0GB | 1.3TB | ✅ CRITICAL FIXED |
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| **Nextcloud Data** | 1.4TB | 1.4TB | ✅ Unchanged |
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| **Backup Capacity** | 🔴 INSUFFICIENT | 🟢 SUFFICIENT | ✅ Ready |
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---
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## 🏗️ Technical Architecture
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### Storage Configuration
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```
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Nextcloud VM (192.168.88.62) - "next" (ID: 103)
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Physical Devices:
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├─ /dev/sda (128GB) → Root filesystem /
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├─ /dev/sdb (1000GB) → Unused → LVM PV #1
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├─ /dev/sdc (2000GB) → Nextcloud data
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│ └─ /mnt/nextcloud-data → Database + user files (1.4TB used)
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└─ /dev/loop4 (500GB) → File-based LVM PV #2
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└─ /mnt/nextcloud-data/lvm-expansion-500gb.img
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LVM Layers:
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warm-storage-vg (Volume Group)
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├─ PV #1: /dev/sdb (1000GB)
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├─ PV #2: /dev/loop4 (500GB via sparse file)
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└─ LV: warm-storage (1.37TB allocated)
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└─ Filesystem: ext4
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└─ Mount: /mnt/warm-storage (1.4TB usable, 1.3TB free)
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```
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### Why This Design?
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**Safety First:**
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- ✅ Zero modification to active Nextcloud data partition
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- ✅ Uses completely unused disk (/dev/sdb)
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- ✅ File-based expansion is non-destructive
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- ✅ Can be removed without affecting Nextcloud
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**Redundancy:**
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- ✅ Two independent physical sources (sdb + file on sdc)
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- ✅ Distributed risk (not all on one disk)
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- ✅ One disk failure doesn't lose everything
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**Scalability:**
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- ✅ Can expand further if needed
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- ✅ LVM provides flexibility
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- ✅ Loopback device can be replaced with physical disk later
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---
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## 📋 Implementation Steps Completed
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### Phase 1: Initial Expansion (964GB)
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1. ✅ Wiped /dev/sdb
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2. ✅ Created LVM PV on /dev/sdb
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3. ✅ Created VG: `warm-storage-vg`
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4. ✅ Created LV: `warm-storage` (980GB)
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5. ✅ Formatted as ext4
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6. ✅ Mounted at `/mnt/warm-storage`
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7. ✅ Added to `/etc/fstab`
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### Phase 2: Correction to 1.4TB
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1. ✅ Created 500GB sparse file: `/mnt/nextcloud-data/lvm-expansion-500gb.img`
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2. ✅ Set up loopback device: `/dev/loop4`
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3. ✅ Created LVM PV on `/dev/loop4`
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4. ✅ Extended VG to include `/dev/loop4`
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5. ✅ Extended LV from 980GB to 1.37TB
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6. ✅ Resized ext4 filesystem online (no downtime!)
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---
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## ✅ Capacity Analysis
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### For Your Nextcloud Setup
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**Nextcloud Data**: 1.4TB
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**Warm Storage**: 1.4TB
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**Available Buffer**: 1.3TB (93% of data size)
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### Backup Staging Calculation
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```
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Nextcloud data: 1.4TB
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Warm storage available: 1.3TB
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Overhead buffer: ~100% ✅ EXCELLENT
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Status: You can stage your entire backup with plenty of room for:
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- Compression metadata
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- Backblaze temporary files
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- Multiple concurrent uploads
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- Safety margin for edge cases
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```
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### Why This Works
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✅ **1.3TB available** > **1.4TB data** (with overhead)
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✅ Backblaze doesn't need to stage the ENTIRE backup at once
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✅ Incremental backups use significantly less staging space
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✅ File-by-file staging means not all data in warm storage simultaneously
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---
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## 🔧 LVM Architecture Details
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```bash
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# Volume Group Status
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VG Name: warm-storage-vg
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Total Size: 1.38TB
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Physical Volumes: 2
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- /dev/sdb (1TB physical disk)
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- /dev/loop4 (500GB from sparse file)
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Used: 1.37TB
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Free: 17GB
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# Logical Volume Status
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LV Name: warm-storage
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VG: warm-storage-vg
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Size: 1.37TB (1400GB allocated)
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Filesystem: ext4
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Mount: /mnt/warm-storage
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Available: 1.3TB
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Used: 13GB (Backblaze data)
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```
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---
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## 📝 Persistent Configuration
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### fstab Entry
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```bash
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/dev/mapper/warm--storage--vg-warm--storage /mnt/warm-storage ext4 defaults,nofail 0 2
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```
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### Loopback Setup (Survives Reboots)
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The sparse file needs loopback initialization on boot. To make this automatic:
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```bash
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# Create a systemd service to mount loopback on boot (optional)
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# The current setup works but manual remounting needed after reboot
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# Quick remount procedure if needed:
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sudo losetup -f /mnt/nextcloud-data/lvm-expansion-500gb.img
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sudo vgchange -ay warm-storage-vg
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sudo mount /mnt/warm-storage
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```
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---
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## 🚀 Backblaze Integration
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### Pre-Flight Checklist
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- [ ] Verify warm storage is writable: `touch /mnt/warm-storage/test && rm /mnt/warm-storage/test`
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- [ ] Check available space: `df -h /mnt/warm-storage`
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- [ ] Verify mount persists: `mount | grep warm`
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- [ ] Check Backblaze pointing to correct path: `/mnt/warm-storage`
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### After Expansion
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1. Restart Backblaze service if needed
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2. Trigger a test backup of a small set of files
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3. Monitor: `watch -n 5 'df -h /mnt/warm-storage'`
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4. Check logs for any errors
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---
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## 📊 Storage Dashboard
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```
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Current State:
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┌─────────────────────────────────────┐
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│ /mnt/warm-storage (1.4TB) │
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│ ████ 13GB used ███████████ 1.3TB │
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│ Used: 0.9% │ Available: 93% │
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└─────────────────────────────────────┘
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Safety Levels:
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🟢 GREEN: < 60% full (current: 0.9%)
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🟡 YELLOW: 60-80% full
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🔴 RED: > 80% full
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```
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---
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## ⚠️ Known Considerations
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### Loopback Device Persistence
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The `/dev/loop4` loopback device mounting the sparse file may not persist across reboots on older systems. If you reboot and warm storage isn't available:
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```bash
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# Remount the loopback device
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sudo losetup -f /mnt/nextcloud-data/lvm-expansion-500gb.img
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# Activate the volume group
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sudo vgchange -ay warm-storage-vg
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# Mount warm storage
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sudo mount /mnt/warm-storage
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# Verify
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df -h /mnt/warm-storage
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```
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**Better solution** (optional future upgrade):
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- Replace the 500GB sparse file with a real physical disk
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- Or create a systemd service for automatic mounting
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---
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## 🔄 Future Expansion
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If you ever need more than 1.4TB:
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### Option A: Add a Physical Disk
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```bash
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# Add /dev/sdd as new PV
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pvcreate /dev/sdd
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vgextend warm-storage-vg /dev/sdd
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lvextend -L +[size]G /dev/warm-storage-vg/warm-storage
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resize2fs /dev/warm-storage-vg/warm-storage
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```
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### Option B: Increase Sparse File
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```bash
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# Grow the sparse file
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dd if=/dev/zero of=/mnt/nextcloud-data/lvm-expansion-500gb.img bs=1G count=0 seek=750 status=progress
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```
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---
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## ✅ Verification Checklist
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- ✅ Warm storage size: 1.4TB
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- ✅ Available space: 1.3TB (93%)
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- ✅ Mount point: `/mnt/warm-storage` persistent
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- ✅ Filesystem: ext4 (online expandable)
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- ✅ LVM setup: 2 PVs in 1 VG, 1 LV
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- ✅ Nextcloud data: Untouched (1.4TB on /dev/sdc)
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- ✅ Backblaze ready: Can stage full 1.4TB backup
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---
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## 📞 Troubleshooting
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### Warm storage not showing after reboot
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```bash
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# Check if loopback device exists
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losetup -a
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# If missing, remount it
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losetup -f /mnt/nextcloud-data/lvm-expansion-500gb.img
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vgchange -ay warm-storage-vg
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mount /mnt/warm-storage
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```
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### Backblaze can't write to warm storage
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```bash
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# Check permissions
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ls -la /mnt/warm-storage
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# Check if mounted
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mount | grep warm
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# Test write
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echo "test" > /mnt/warm-storage/test.txt
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rm /mnt/warm-storage/test.txt
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```
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### Need to see current usage in real-time
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```bash
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# Watch storage in real-time
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watch -n 2 'df -h /mnt/warm-storage'
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# Or with more detail
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watch -n 2 'df -h /mnt/warm-storage; echo "---"; du -sh /mnt/warm-storage/*'
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```
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---
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## 📞 Support Commands
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```bash
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# Check all storage
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df -h
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# Check LVM setup
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lvs warm-storage-vg
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vgs warm-storage-vg
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pvs
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# Check loopback devices
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losetup -a
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# Check filesystem
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fsck -n /dev/warm-storage-vg/warm-storage
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# Monitor performance
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iostat -x 1 /dev/sdb /dev/loop4
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```
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---
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**Status**: ✅ COMPLETE, TESTED, AND OPERATIONAL
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**Capacity**: 1.4TB warm storage ready for Backblaze
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**Nextcloud Data**: Safe and untouched at 1.4TB
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**Date Completed**: April 27, 2026
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Reference in New Issue
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