On August 5, 2025, Proxmox VE 9.0 was officially released, marking a significant milestone in the platform’s continuous evolution. This version brings a wealth of enhancements spanning core infrastructure, storage, networking, and user experience—let’s break down the key highlights.
Debian 13 “Trixie” & Linux Kernel 6.14.8-2
Proxmox VE 9.0 is now based on Debian 13 “Trixie” and ships with the updated Linux Kernel 6.14.8-2 as its stable default.
This foundational upgrade ensures better hardware support, security, and performance.
Storage Enhancements: Snapshots & ZFS Improvements
- Snapshots for Thick-Provisioned LVM: Support for VM snapshots on thick-provisioned LVM using volume chains (technology preview), suitable for shared storage environments like iSCSI or Fibre Channel.
- ZFS 2.3.3 & RAID-Z Expansion: ZFS upgraded to version 2.3.3 introduces RAID-Z expansion—allowing adding devices to a RAID-Z pool without downtime—and ARC memory metrics now display in resource statistics.
Software-Defined Networking (SDN): Fabrics
The SDN stack gains a powerful addition with “Fabrics”, enabling users to construct complex network topologies—via OpenFabric or OSPF—with minimal configuration.
High-Availability (HA) Resource Affinity
New HA rules let administrators define node and resource affinity, specifying where HA workloads should and shouldn’t be placed, improving cluster resilience and workload control.
UI and Mobile Improvements
A modernized mobile interface makes managing Proxmox clusters from tablets or phones significantly smoother and more intuitive.
Core Components Updated
Several critical components have been upgraded:
- QEMU 10.0.2
- LXC 6.0.4
- Ceph Squid 19.2.3
Upgrade & Availability
- Download & Install: Proxmox VE 9.0 ISO (version 9.0-1, ~1.64 GB) became available on August 5, 2025.
- Upgrade Path: Smooth upgrade instructions are available for users migrating from Proxmox VE 8.x (such as 8.4); planning, backups, and compatibility checks are strongly advised.
Community Feedback & Caution
Early feedback on forums highlights potential compatibility issues when upgrading, especially with Proxmox Backup Server (PBS)—some reports suggest PVE 9.0 may require PBS 4.0 Beta or additional configuration to work smoothly.
Summary Table
| Feature Area | Highlights |
|---|---|
| Base System | Debian 13 “Trixie”, Kernel 6.14.8-2 |
| Storage | LVM snapshots, ZFS with RAID-Z expansion, ARC metrics |
| Networking (SDN) | Fabrics: easy complex topology creation |
| High-Availability (HA) | Node & resource affinity control |
| UI/UX | Updated mobile interface |
| Core Components | QEMU 10.0.2, LXC 6.0.4, Ceph Squid 19.2.3 |
| Upgrade & Deployment | ISO available Aug 5; in-place upgrade supported |
| Community Insight | Some backup compatibility issues observed |