Proxmox VE vs Harvester

Which platform fits which team scenario

This table maps common team situations to the platform that usually fits better, with the reason and the condition under which the other option would still win. Read each row against your own hardware, Kubernetes footprint and operating skills, since the right answer depends on which constraint is hardest for your team.

How each platform is built and what that means for operations

Proxmox VE and Harvester both put virtual machines on KVM, but they reach that goal through different layers. Proxmox VE is a Debian host with its own cluster stack, while Harvester asks you to operate Kubernetes underneath every VM. The cards below cover the parts that shape daily work: the host, the cluster, storage and the skills your team needs on call.

Proxmox VE vs Harvester feature by feature

This table sets Proxmox VE and Harvester side by side on the capabilities that usually decide a VMware replacement, from license and cluster model to hardware minimums and management. Where a supplied fact does not cover a row for one platform, the cell tells you what to confirm before you commit.

What is free, what is paid and what the subscription covers

What drives the running cost of each platform

Moving workloads between Proxmox VE and Harvester

This sequence moves virtual machines between the two platforms without guessing at what transfers and what must be rebuilt. Each stage ends with a check that tells the team whether it can advance to the next one.

1. Inventory every workload and its dependencies

   The platform team lists each VM with its operating system, disk sizes, CPU and memory, network attachments, backup jobs, HA rules, monitoring agents and the identity sources it authenticates against. For VMware sources, record whether VMware Tools is installed on each guest, because that decides the shutdown method later. For Proxmox VE sources, record whether guests use LVM, ZFS, Ceph RBD or NFS storage. The step is done when every workload has a row in a written inventory that a second engineer has reviewed and that names an owner for each dependency.

2. Map what transfers and what must be rebuilt

   The team separates what moves with the disk image from what must be recreated on the target. Virtual disks and basic VM settings can move through an import path. Networks, storage classes, backup jobs, HA rules, monitoring integrations and identity integrations do not move automatically and must be rebuilt on the target platform. Proxmox VE HA depends on at least three cluster nodes, shared storage and watchdog-based fencing, while Harvester places storage on Longhorn and monitoring on Grafana and Prometheus, so the target design differs from the source. The output is a written mapping that lists each item as transfers, rebuilt or retired, with the owner of each rebuild task.

3. Run a pilot with non-critical workloads

   The team selects a small set of low-risk VMs and moves them first. For a Harvester target, the vm-import-controller add-on must be enabled before any import starts, and the team should confirm it works on the Harvester version in use. Each pilot VM is booted on the target, checked for network reachability, and run for a period the team agrees on. The pilot is complete when the team has documented one successful import per guest type, the rebuild tasks for that pilot are closed, and the process notes are updated with any errors found.

4. Prepare scratch storage and shutdown method

   Before a production import, the team provisions scratch storage on the target. The Harvester VM import documentation recommends scratch space of about twice the size of the largest VM being migrated. For each source guest, the team confirms the shutdown method. The Harvester controller attempts a graceful guest shutdown and forces power-off after a default of 60 seconds. VMware guests without VMware Tools need forcePowerOff to be set or a manual shutdown scheduled, because otherwise a guest that does not respond to the graceful request may be left in an inconsistent state. The step is done when scratch capacity is confirmed in writing and every guest has a recorded shutdown method.

5. Import in batches with a rollback point

   The team imports VMs in batches sized to the storage and network capacity the target can carry. Before each batch, it takes a verified backup of the source VMs, using the backup method already in place, so that the source remains a recovery point until cutover is approved. The import runs in order of the inventory, and the team watches the controller status for each VM. The batch is complete when each imported VM has a recorded import status, boots on the target, and the backup of the source is retained for the agreed rollback window.

6. Validate applications, access and monitoring

   For each imported workload, the owning team checks that the application starts, that dependent services reach it, and that authentication works with the rebuilt identity integration. The platform team confirms that backup jobs run on the target, that monitoring collects metrics and logs for each VM, and that alerts fire in a controlled test. Where a workload relies on HA, the team checks that failover behavior matches the documented design on the target platform. Validation is done when each owner signs off the workload against the inventory and the test results are filed.

7. Cut over and decommission the source

   The team schedules cutover for each workload with the business owner, switches DNS or load balancer entries, and keeps the source VM powered off but not deleted until the rollback window closes. Cutover is complete when traffic reaches the target, the change record names who approved it, and the source VM is retained for recovery. Decommissioning the source happens only after the agreed window ends with no open defects. Ask the vendor or your own environment to confirm the supported import paths for your exact source and target versions before committing to a date.

8. Document the cost of staying on one platform

   Once the workloads run on the target, the team records the switching cost for future moves. Harvester storage runs on Longhorn and its workloads are managed through Kubernetes and KubeVirt, so a team that builds its operations on those layers takes on Kubernetes skills and Longhorn entitlement terms as recurring obligations. Proxmox VE workloads that depend on Ceph or ZFS replication, or on Proxmox-specific backup jobs, carry the same kind of lock-in in reverse. The output is a short register listing each storage, orchestration and backup dependency with its exit effort, so future platform decisions start from written facts.

What implementing each platform involves and where projects run long

Proxmox VE vs Harvester cost, effort and team questions