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Sala de servidores con racks cableados y un módulo de gestión de potencia
9 min read

Moving to Proxmox 9.2 wasn't your call: the repository made it

Ask whoever runs your cluster who decided to go from 9.1 to 9.2, and in which meeting it was approved. In most places nobody decided: Proxmox VE ships no repository per minor version —there is nothing like a pve-9.1-security— so a routine apt dist-upgrade, the same one applying the patches you do want, leaves you on the latest published minor. The software that takes your backups does have a supported-version matrix, and it runs behind: Proxmox VE 9.2 shipped on 21 May 2026 and the Veeam plug-in covering it arrived on 29 July, 69 days later. And one detail misleads: plug-in 3.3 for the 13.0 branch shipped on 25 August, twenty-seven days AFTER 4.0, so "I am up to date" can mean up to date on the branch that does not carry the new support. Nothing turns red; what you lose is the right to open a case. The three facts that must live on the same line before you open the window, why the right order is matrix first and apt second, the ARM architecture boundary, and where this crack does not exist.

Proxmox Backup Maintenance
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Técnico agachado detrás de un rack, con el portátil apoyado en el suelo técnico y un manojo de cables sueltos al lado
10 min read

Moving to Proxmox doesn't touch your licences; failover does

The Windows licensing question comes up in every migration meeting, and the short answer disappoints everyone: changing hypervisor recalculates nothing. Something else changes the bill, and Microsoft has it written in a single sentence: "License Mobility across Server Farms is not available for Windows Server, so each server must be licensed for peak capacity at all times." Each server, peak capacity, at all times. The licence does not follow the virtual machine, so the number depends on how many nodes it could ever start on: 32 core licences or 96, for exactly the same installation. What changed in SQL Server 2022, why the AVMA myth does not apply to you if you are coming from vSphere, and why a Proxmox affinity rule is a useful control but not a contractual boundary.

Migration Licensing Virtualization
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Armario de servidores con cada máquina etiquetada a mano, una por una
8 min read

Your Proxmox backup skips disks and the job still turns green

The limitations page for the Veeam plug-in for Proxmox VE was updated on 15 September 2026, and two lines in it carry the word that really matters: skipped. There are two very different kinds of "not supported": the one that stops your job and the one that skips a disk and paints the job green. What falls outside the backup of a Proxmox platform, what does not come back when the machine comes back, why LXC containers are a separate inventory, and why the backup manual gets read before you choose your storage rather than on restore day.

Proxmox Backup Disaster Recovery
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Frontal de varios servidores de rack apilados, con sus bandejas de disco etiquetadas y los pilotos de estado encendidos
9 min read

Piloting a VMware alternative is not migrating

Gartner has put a number on leaving VMware, and the number will be misquoted all autumn: by 2029, 55% of enterprises "will initiate proofs of concept" for alternatives, up from 25% in 2026. Initiate pilots, not migrate. Our argument is that most of those pilots will not help anyone decide anything, because they are built to succeed: install it, boot a VM, close the meeting. The six things an honest pilot has to try to break — starting with the restore, not the migration — the variable no analyst can give you (your renewal date), and the cases where we still tell people to stay.

Virtualization VMware Migration
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Pasillo frío de un centro de datos con una silla vacía y un carro de consola aparcado junto a un armario abierto
7 min read

The Proxmox CVE your scanner cannot evaluate

CVE-2023-54391 is a 9.8: you get in as root@pam with no password. We queried its record through the NVD API and the GitHub Advisories API, and here is what comes back: NVD publishes no CPE configuration at all and flags the record as Deferred; GitHub returns an empty list of affected packages; and the only range that exists stops at "7.4" while your nodes call themselves 7.4-17. A scanner that decides by version matching has nothing to decide with. Meanwhile a provider published its post mortem: twelve hypervisors mining from 31 August to 17 September, logs wiped and the sentence "we cannot prove it".

Proxmox Vulnerabilities Virtualization
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Cabina de disco montada en rack, con dos filas de bandejas de disco y sus pilotos de actividad
10 min read

Moving to Proxmox and reusing your SAN: the snapshot is what does not travel

The array is paid for, so it stays: the cheapest-looking decision in the project and the one that changes your day-to-day the most. In Proxmox the snapshot is not taken by the hypervisor but by the storage plugin, and on a shared LUN with LVM-thick the documentation says «snapshots are not possible by default…». What fixes that has been labelled a technology preview since 9.0, and the vendor puts it in writing on its own roadmap. The seven real options and the decision tree we are willing to sign.

Proxmox Virtualization Storage
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Pasillo de un centro de datos con dos filas de armarios de rack idénticos
9 min read

The cluster picks a node by counting guests: anti-affinity in Proxmox VE 9 and the rule nobody declares

When a node goes down, the Proxmox VE scheduler decides where your HA-managed machines come back up. On a freshly installed cluster it does that by counting active guests: it has no idea that 101 is the second leg of 100. Proxmox VE 9.0 brought affinity rules so you can tell it, with an asymmetry worth knowing — the rule that pins a guest to a node is a preference, the rule that keeps two guests apart is an order — and an arithmetic that decides whether your VM comes back degraded or does not come back at all.

Proxmox High availability Virtualization
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Parte trasera de una librería de cintas con las unidades LTO y su cableado de fibra
5 min read

Broadcom pulls the VDDK: the first thing that breaks is not your migration, it is your backup

In late August the download pages for the Virtual Disk Development Kit started returning a 404, with no announcement and no deprecation notice. The coverage has read it as "leaving VMware just got harder", and that is half true: it depends where you are going, because Proxmox VE's ESXi importer does not even use it. What almost nobody has looked at is Broadcom's exact wording — "no longer available for use or download" — or the place where that library has been working for twenty years without anyone looking at it: inside your backup.

VMware Backup Virtualization
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Armarios de rack vacíos recién instalados en el pasillo de una oficina
9 min read

VMware to Proxmox: the disk arrives intact, Windows will not boot, and the mistake was made two weeks earlier

The Proxmox VE import wizard copies the machine off ESXi without a hitch. Then Windows will not boot, and it is not the wizard's fault: the official documentation says that to boot from VirtIO SCSI, Windows "needs to see a disk requiring the driver before". That before is the problem, because the only place you can do it is the machine you have already shut down. The official way out works, but it is a per-machine, sequential procedure that lives inside the maintenance window. The alternative is not to speed it up: it is to move it to another date.

Virtualization Migration VMware
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Cuarto de informática de una empresa pequeña con un bastidor abierto de dos servidores, un SAI abajo, estanterías con discos de repuesto y una mesa plegable con una caja de herramientas
9 min read

VMware brings back vSphere Standard: how to read an announcement that does not exist

On 2 September 2026, two Broadcom executives told the press there will be a new vSphere Standard. No keynote, no press release, no price and no date. The last time the rules changed for this segment—the 72-core minimum of April 2025—that news also arrived through a distributor email, and the reversal through a revised price list. What was actually said, where Broadcom draws the line for "small", and six things you can do before 13 October.

VMware Licensing Virtualization
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Sala de servidores de empresa de noche, con las luces apagadas, la puerta entreabierta a un pasillo iluminado, un taburete vacío junto al rack y un carro de servicio aparcado en el pasillo
5 min read

Proxmox goes 24/7 on 19 October: what those two hours actually buy you

On 2 September 2026 Proxmox announced that its enterprise support goes 24/7 on 19 October, and opened a North American subsidiary. Until now it ran Monday to Friday, 07:00–17:00 CET/CEST, on Austrian business days. What each plan includes, what it really costs per CPU socket, the three asymmetries sitting inside the announcement itself —response is not resolution, local support stays office hours, and the scope is three products rather than your system— and the six questions for reading any 24/7 support contract, your provider's included.

Proxmox Support Virtualization
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Omnissa Horizon certificado en Proxmox VE: dos puestos de oficina vacíos con los monitores apagados y un cliente ligero detrás de la pantalla
9 min read

Proxmox VE is now Horizon Ready, but in manual mode: you create and power off the desktops yourself

On 4 September 2026 Proxmox announced that Proxmox VE has achieved Omnissa Horizon Ready Hypervisor certification. It is real and it removes a requirement, but it lands in "Manual Provisioning Mode": the program page states that provisioning and power policy are not supported. Meanwhile, Horizon has been integrating over the API with another non-vSphere hypervisor since December. Two different regimes, what Horizon stops doing for you, the RAM and GPU arithmetic nobody runs, and which estates this is a way out for today.

Virtualization Proxmox Workplace
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Proxmox VE 7 y CVE-2023-54391: dos servidores viejos todavía encendidos en la estantería de un cuarto trastero
7 min read

Proxmox VE 7: the patch had been out for three years and nobody knew it was a patch

On 1 September 2026 Proxmox published advisory PSA-2026-00043-1: on Proxmox VE 7, sending any tfa-challenge value is enough to log in as root@pam with no password. The code that fixed it shipped on 20 July 2023 inside a refactor nobody classified as security, which is why it was never backported. What the flaw does, why a second factor saved you, what to check on your node today, and what all of this says about your inventory.

Proxmox Cybersecurity Virtualization
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Memoria por niveles de VMware: NVMe local haciendo de RAM en un servidor ESX
9 min read

NVMe standing in for RAM: memory tiering works if half of yours is idle

VMware refines memory tiering in Cloud Foundation 9.1, available since 9.0: cold pages demoted from DRAM to a local NVMe drive so a host ends up with more memory than you bought. What almost nobody quotes is the recommendation VMware itself published on its blog on 6 August: keep active memory below 50% of physical memory. The requirements, the limits, what is known about the 25% of workloads that does not fit today, and why a memory reservation does not get you out of it.

VMware Virtualization Infrastructure
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Parte trasera de un rack abierto con servidores apilados y cables de red recogidos con bridas
11 min read

Migrating to Proxmox: the network is not held by the cluster, it is held by each node

In a VMware to Proxmox migration everybody watches the disks. Disks are the easy part: they either arrive or they do not, and you find out straight away. What gets left out of the luggage is the network configuration: in Proxmox VE it lives in a file on each node, outside the filesystem the cluster replicates. We go through the documentation sentence that says so, why the bridge is missing from the official list of live migration requirements, what the MAC change drags with it, the 10.0.2.x symptom that wastes hours, and how far SDN really takes you.

Proxmox Virtualization Networking
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Pasillo de un centro de datos con un rack abierto a medio poblar y un carro elevador con un servidor encima
5 min read

When NOT to migrate from VMware to Proxmox

Migrating from VMware to Proxmox is part of what we do, and there are cases where our answer is: not now. Two classic objections no longer hold — the scheduler's dynamic mode arrived with Proxmox VE 9.2 on 21 May, and Veeam 13.1 has shipped replication since 29 July. The one still standing is different: Proxmox's HA documentation describes nothing equivalent to vSphere's <em>admission control</em>, which flatly refuses to power on the machine that would break your N-1. And the <code>crs</code> factory settings decide more than people think: <code>ha=basic</code> balances by counting machines. The five cases where we tell clients to stay.

Proxmox VMware Virtualization
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Rack abierto en una sala de servidores con dos bandejas de disco a medio sacar
5 min read

10% of the VMDK is enough: the arithmetic that changes your recovery plan

The ESXi encryptor Rapid7 took apart carries a percentage parameter, and the value observed was 10: on a large VMDK it touches only a tenth of the file, and that is enough to stop it booting. Partial encryption is not new — LockFile was doing it in 2021 — but the numbers are. What it does to your response clock, why no EDR agent belongs on the hypervisor (Broadcom says in so many words that it is not supported), what the same actor does to backup services, and why swapping hypervisors is not a security control.

Ransomware Virtualization Disaster recovery
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Servidor de almacenamiento de 4U extraído sobre sus guías en una sala de servidores, con la tapa quitada y las filas de discos a la vista
9 min read

Proxmox's "protected" flag is not a lock, it's a latch

The Pay2Key ransomware shuts down the guests on a Proxmox cluster and deletes the backups using Proxmox's own API: first a <code>--protected 0</code>, then the delete. We read the pve-storage source to see why it works, and the answer is uncomfortable: clearing the latch never costs one privilege more than deleting the backup. What does raise a real boundary, and why it costs nothing.

Proxmox Cybersecurity Backup
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Chasis de servidor de rack abierto sobre un banco de taller, con la tapa retirada y dos disipadores de procesador a la vista entre los bancos de memoria
5 min read

Azure stops including the VMware licence: the core count nobody does

Two weeks ago we wrote that 31 October 2026 is the end of Azure VMware Solution with the licence included. Microsoft has since published its portable licensing reference, and that is where the counting rules are: how many cores each node type has, why the distributed firewall counts every host in the private cloud even the ones you are not paying for, and which date actually governs your calendar, because it is not the August 2027 one.

VMware Licensing Azure
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