#qemu
Every post tagged qemu.
Blog posts
How to Fix a Proxmox VE VM That Won't Start (TASK ERROR Messages Explained)
Your Proxmox VM won't start and the task log just says TASK ERROR? Here's how to read the real error underneath, and fix the missing disks, full storage, and low RAM that usually cause it.
How to Migrate a VirtualBox VM to Proxmox VE (Step-by-Step Guide)
Move an existing VirtualBox VM to Proxmox VE without rebuilding it from scratch. Copy the disk, import it with qm disk import, and fix the boot and driver issues that trip up most migrations.
How to Install Proxmox VE on a Mac Using UTM (Apple Silicon and Intel)
No spare hardware and no PC? You can run Proxmox VE 9.2 right inside UTM on a Mac. This guide covers the Emulate vs Virtualize split between Apple Silicon and Intel, and what actually works on each.
How to Limit Disk I/O (Bandwidth and IOPS) for a Virtual Machine in Proxmox VE
One noisy VM can slow down every other guest on shared storage. Here is how to cap read/write speed and IOPS per disk in Proxmox VE, from the GUI and the qm command line.
Proxmox VE Disk Image Formats Explained: Raw vs qcow2 vs VMDK
Raw, qcow2, and vmdk look like an arbitrary dropdown when you add a VM disk in Proxmox VE, but each one trades off snapshots, thin provisioning, and I/O overhead differently. Here is what each format actually does, which storage backends support them, and how to convert between them without guesswork.
Understanding Proxmox VE Disk Cache Modes: Write Back, Write Through, None, and Direct Sync Explained
Learn what each Proxmox VE disk cache mode actually does at the QEMU level, why ZFS needs Direct sync instead of the default, and how to choose safely between No cache, Write back, Write through, and Write back (unsafe) without risking data loss on host failure.
How to Configure HugePages for Proxmox VE Virtual Machines (Static and Transparent)
Reduce TLB overhead and get predictable memory latency for databases and DPDK workloads by reserving static HugePages in Proxmox VE, configuring NUMA-aware VMs, and understanding why HugePages and memory ballooning can't be used together.
How Memory Ballooning Works in Proxmox VE (And When to Disable It)
A deep dive into how the virtio-balloon device lets Proxmox VE dynamically resize VM memory, how to configure it via the GUI and qm.conf, and when you should turn it off for databases, PCI passthrough, and SLA-bound workloads.
How to Install VirtIO Drivers for Windows VMs in Proxmox VE
Windows can't see VirtIO disks or network cards without extra drivers. Here's how to attach the virtio-win ISO, load the storage driver during setup, and finish with the guest tools installer.
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