🗄️ Proxmox – P19: How To Resize Local and Local-LVM on Proxmox VE (Step-by-Step Guide)

Managing storage efficiently is a critical task for maintaining a stable, flexible, and scalable Proxmox VE environment. As virtual machines, backups, and ISO files grow over time, system administrators often need to adjust storage allocation between local and local-lvm without reinstalling Proxmox or disrupting running workloads.

In this step-by-step tutorial, you will learn how to resize Local and Local-LVM storage on Proxmox VE safely, using real-world scenarios commonly faced by IT administrators and homelab users.

By following this guide, you will be able to:

• ✅ Understand the Proxmox disk and LVM layout

• ✅ Increase Local storage by reducing Local-LVM

• ✅ Increase Local-LVM by reducing Local storage

• ✅ Avoid common mistakes that can cause data loss

• ✅ Resize storage without reinstalling Proxmox VE

This guide is suitable for beginners, system administrators, and Proxmox users who want more control over their storage layout.

🧪 Lab Environment

Initial storage layout:

• Local: 27.21 GB

• Local-LVM: 21.88 GB

Two common use cases will be demonstrated:

1. Reduce local-lvm to increase local

2. Reduce local to increase local-lvm

🔁 Case 1: Reduce Local-LVM to Increase Local Storage

Scenario:
You want to increase Local storage by 10 GB for ISO files or backups by reducing Local-LVM.

🧹 Step 1: Remove Local-LVM Storage

Remove Local-LVM from GUI

• Go to Datacenter → Storage

• Select local-lvm

• Click Remove

Remove the logical volume from shell

⚠️ Ensure no VM disks are stored on local-lvm before removing it.

📈 Step 2: Increase Capacity for Local

Resize the root logical volume and filesystem:

This operation expands the local storage without affecting system data.

🔄 Step 3: Recreate Local-LVM (Thin Pool)

Recreate a small local-lvm thin pool:

Create metadata for the thin pool:

🧩 Re-add Local-LVM in GUI

• Go to Datacenter → Storage

• Add LVM-Thin storage

• Select pve/data

Expand the thin pool to use remaining free space:

✅ Local storage is now larger and Local-LVM is recreated successfully.

🔁 Case 2: Reduce Local to Increase Local-LVM

Scenario:
You need to increase Local-LVM by 10 GB, but Local is currently using most of the space.

⚠️ This process cannot be done while the root filesystem is mounted, so we must boot from a live environment.

💿 Step 1: Attach Ubuntu Desktop ISO

• Attach Ubuntu Desktop ISO as a CD

• Or boot from a USB containing Ubuntu Desktop installer

🖥️ Step 2: Enter Ubuntu “Try” Mode

From Ubuntu Desktop:

• Open Terminal

• Check filesystem integrity:

📉 Step 3: Reduce Filesystem Size

⚠️ Always resize filesystem before resizing the logical volume

Example: Reduce Local from 27 GB to 17 GB:

Note: You must specify the remaining size, not the size to subtract.

📉 Step 4: Reduce Logical Volume

This frees space for Local-LVM expansion.

📈 Step 5: Expand Local-LVM (pve/data)

🔄 Step 6: Reboot and Verify

• Remove the Ubuntu ISO

• Shutdown the system

• Boot back into Proxmox

Verify disk layout:

You should now see increased capacity on local-lvm.

⚠️ Important Notes – When NOT to Resize

Do NOT resize storage in the following situations:

• ❌ A VM disk is actively using local-lvm

• ❌ LVM-thin pool is busy or in use

• ❌ Root filesystem (/var/lib/vz) is mounted and active

• ❌ System is running and booted normally (use live environment instead)

➡️ In these cases, use Case 2 with a live OS to avoid data corruption.

✅ Conclusion

In this tutorial, you have learned how to:

• Resize Local and Local-LVM on Proxmox VE

• Safely reallocate storage without reinstalling the system

• Handle both online and offline resize scenarios

• Avoid common LVM and filesystem resizing mistakes

Proper storage management allows your Proxmox server to:
✔ Scale with growing workloads
✔ Optimize disk usage
✔ Reduce downtime
✔ Increase long-term stability

Whether you are managing a homelab or a production Proxmox cluster, understanding how to resize Local and Local-LVM is an essential system administration skill.

🎯 Follow this guide carefully, and your Proxmox environment will remain flexible, efficient, and future-ready.