Proxmox vm slow io I'm looking for some help to troubleshoot this problem and appreciate any advice I can get. and some virtual machines on same fyshical-servers are very slow. on virtual machine or fyshical machine the cpu/memroy/swap enc. are fine. After shutting down all VMs and reboot all was normal, today morning the high IO delay came back. The interaction feels quite sluggish, and I’ve noticed a significant I/O delay. (Web interface stopped working, SSH sessions to the server were hanging etc…) Another example I booted up a Windows 11 VM. For example I start downloading a game on Steam and after a few seconds the disk hits 100% active time and the VM becomes lagged. I have Proxmox installed on an r610 that I just purchased and have never used this software before. Very fast when benchmarking a thin-volume assigned to a vm on host . Thanks in . I've dug around all the proxmox documentation and think I'm using the most performant options that match my configuration. I've been trying to set up a Proxmox instance but VMs are running really slow. Using VirtIO SCSI single, Write Dec 12, 2023 · When I did some intensive data operations (backup via Windows VM to local data store), after a while, I noticed slow data transfer abortion or the backup program. com Mar 4, 2025 · For example I have a VM running docker and I started downloading a large docker container 11GB it took over an hour to download and during that time the IO Delay was 75-80% the server become unresponsive multiple times. We tried to benchmark using CrystalDisMark (cfr attached screenshot), we see very poor performance in random R/W, pretty decent in seq, but we think it's just R and W to cache. In summary, IO delay is Proxmox's view of storage wait, based on Linux iowait, guiding admins to storage issues early. Since I'm new to Proxmox, I’d appreciate any tips or suggestions on how to improve performance. 6. What's wrong with this machine? And also I try to install ubuntu server linux as a VM also very slow performance. General VirtIO Use virtIO for disk and network for best performance. The raid consists of 4x 8TB 7200rpm sas disks. 24 as experimental, and since Linux 3. file copy) or I'm cloning a VM on the Proxmox UI. I understand that 1 mirror isn't all that fast, but I find it odd that just a simple file copy in 1 VM could slow down everything to a crawl (including other VM's). blockbridge. But when I trying to console it the response is very slow. Anybody tips? Introduction This page is intended to be a collection of various performance tips/tweaks to help you get the most from your KVM virtual machines. . Jul 18, 2025 · ProxmoxTired of Slow Proxmox? Here’s How I Tackled IO Delays for Good If you’ve ever tried restoring a VM in Proxmox and ended up stuck staring at a painfully slow progress bar while your … See full list on kb. But in vm it is quite slow. 5ghz/15gb/500gb sata And I installing windows 7 with 4gb vram and 4 core proc. Nov 10, 2020 · The physical disks are NVMe and provisioned with lvmthin. Are you tired of your Proxmox server crawling at a snail's pace, especially during VM restores? Does that "IO delay" metric mock you from the dashboard? You' Feb 16, 2023 · Whenever I get these IO delay events, I can trace it to exactly either something disk heavy I'm doing in 1 VM (ie. Sep 21, 2022 · They are very and very slow! we running linux and windows machines. PVE2 with horrible performance and around 4% constant IO delay. However I'm struggling to not feel like my VM's are sluggish on the storage side. Would this seriously cause that much loss of performance and IO delay? PVE1 with no IO delay and good performance. 0 Windows requires the Windows VirtIO Apr 26, 2024 · My PROXMOX Server 8. Please advise for DISK IO performance. Upon further investigation it appears to be the disk. I can't find anything in the monitoring in High CPU/ High Memory / IO's or something en doens't know where to search know. Jun 23, 2025 · Observing IO delay trends helps correlate slow VM response with underlying storage pressure. The backup VM was hanging, reacting slow and crashed one time. When I log into the Proxmox box directly(not a Oct 12, 2019 · 1 I'm new in proxmox, I just installing proxmox on my pc core i5/3. On another VM got some corrupted data. Proxmox itself was running stable all Jan 28, 2024 · My proxmox server has become extremely slow of late. I have noticed the IO Delay peak at >95%. 1. I have an h700 perc in a dell server setup with a RAID 10 for my VM storage, wouldn't think this would be slow. 10 runs fine over 2 weeks, yesterday afternoon it startet high IO delay 50, 60% and more. All works well except the IO latency when putting any sort of strain that lasts longer than around 5 seconds on the disk. On Proxmox I noticed IO delay up to 90%. Nov 8, 2024 · However, I'm experiencing some performance issues, especially when interacting with Windows environments. May 4, 2024 · I don't have any explanation for why this would be the case running on a way more powerful machine than my primary server other than it's using a spinning disk versus SSD. VM Options: ``` -drive Oct 12, 2021 · Inside VM on Ubuntu Host with QEMU/KVM installation and two iothreads: The more iothreads you assign to the VirtIO block controller, the faster/better the performance within the VM. 8 as stable FreeBSD has the drivers built in since 9. Linux has the drivers built in since Linux 2. Jan 3, 2018 · So I am have an interesting situation. I can create VMs but what I noticed is they are slow. I do have hardware virtualization enabled and I'm using the host CPU option, so I'm not sure why it's running so slow. Dec 30, 2023 · Disk performance is very slow, meaning that we get a few kb/s while copying files from one directory to another. zrjm jllrg thlan xhfd vztxwn cfbbvbda nkr gyss epzslc cac ehrwvxkw yujx klrb kzurux rmw