#troubleshooting
Every post tagged troubleshooting.
Blog posts
How to Fix Network Problems in Proxmox VE (VM Has No Internet Access)
Your VM boots fine but can't reach the network. Here's the actual diagnostic order — bridge, guest IP, firewall, VLAN — that finds the real cause in Proxmox VE instead of guessing and reinstalling.
Common Mistakes New Proxmox VE Users Make (And How to Avoid Them)
From deleting local-lvm by accident to locking yourself out with the firewall, these are the beginner mistakes that trip up almost every new Proxmox VE admin — and how to avoid or fix each one.
How to Fix High RAM Usage in Proxmox VE (And What's Actually Normal)
free -h showing 90% used and panicking? Learn why ZFS ARC and KSM make Proxmox VE memory usage look scary, how to tell real pressure from normal caching, and what to actually fix.
How to Fix High CPU Usage on a Proxmox VE Host
Proxmox CPU graph pinned high? Learn how to tell host load from guest load, spot iowait masquerading as CPU usage, trace a busy KVM process back to its VM, and fix the real cause.
How to Fix "VM Won't Start" Errors in Proxmox VE (Common Causes and Fixes)
Your Proxmox VM won't boot and the task log is full of jargon? Here's how to actually read that error, find out what's really wrong, and get the VM running again.
Recovering From LVM-Thin Metadata Exhaustion on Proxmox VE
A Proxmox VE thin pool can hit 100% metadata usage while data space still looks fine, sending VMs into read-only I/O errors. Here's how to diagnose it with lvs and dmsetup, fix it live with lvextend, and stop it from recurring.
Diagnosing and Fixing Failed Proxmox VE Storage Replication Jobs
ZFS-based replication keeps Proxmox VE HA working without a SAN, but jobs fail quietly from broken snapshot chains, renamed storage IDs, and full target pools. Here's how to read pvesr's errors, find the real root cause, and trust the GUI again.
Diagnosing GPU Passthrough Failures on Proxmox VE 9.x: IOMMU Groups, VFIO Binding, and Reset Quirks
GPU passthrough breaks in a handful of predictable ways: driver race conditions at boot, messy IOMMU groups, GPUs that won't reset cleanly, and firmware unity-map restrictions on newer hardware. Here's how to diagnose and fix each one on Proxmox VE 9.x.
Diagnosing and Fixing Flapping Ceph OSDs in a Proxmox VE Hyper-Converged Cluster
A field-tested workflow for diagnosing flapping and down Ceph OSDs on Proxmox VE 9.2 clusters: network, disk, memory, and clock-skew root causes, with exact pveceph and ceph CLI commands to stabilize and fix the cluster.
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