Recent content by gkovacs

I have a Proxmox (currently running version 8.3) server, that was installed on ZFS RAID1 a few years ago, booting Legacy BIOS mode. There is a 512MB EFI partition present on the boot drives, but when I switch the BIOS to EFI boot mode. nothing happens beside the EFI shell starting. Searching...

I have a Proxmox (currently running version 8) server, that was installed on ZFS RAID1 a few years ago, booting Legacy BIOS mode. There is a 512MB EFI partition present, but when I switch the BIOS to EFI boot mode. nothing happens beside the EFI shell starting. When I try to boot with the...

I just posted this into a new kernel freeze thread... we hade sporadic kernel freezes for a long time (happening every few days to every few weeks) on many servers going back to Proxmox 6 and then 7, using several different kernel versions. We tried many things, but the one thing that ended all...

It may be totally unrelated, but we hade sporadic kernel freezes for a long time (happening every few days to every few weeks) on many servers since Proxmox 6 and then 7, using several different kernel versions. We tried many things, but the one thing that ended all freezes was disabling X2APIC...

Those are old mitigation tips when we did not know the real cause of the problem, but they do not hurt, especially the ZFS settings, they are very useful. The most important 3 steps to solve this almost perfectly are: 1. Using VirtIO-SCSI-Single disk controller for your VM disks 2. Enabling...

This is not entirely true. As newer processors are fully compatible with older models, you can easily and safely migrate guests using an older CPU model set in KVM. For example if you have Ivy Bridge, Haswell and Skylake servers, you should set your KVM guests to the lowest common denominator...

So if I have a NUMA server with 2 sockets, and I want a VM to run on (and use the memory of) a single socket (NUMA node) only, then I should disable the NUMA option and the hypervisor will make sure it will stay on one NUMA node? The wiki says the exact opposite...

pveversion # pveversion -v proxmox-ve: 7.0-2 (running kernel: 5.11.22-7-pve) pve-manager: 7.0-14+1 (running version: 7.0-14+1/08975a4c) pve-kernel-helper: 7.1-4 pve-kernel-5.11: 7.0-10 pve-kernel-5.11.22-7-pve: 5.11.22-12 pve-kernel-5.11.22-4-pve: 5.11.22-9 ceph-fuse: 15.2.14-pve1 corosync...

Upon upgrading (reinstalling one-by-one) our cluster to PVE 7.0, I ran into the following problem: restoring an LXC container shows an error. recovering backed-up configuration from 'NFS:backup/vzdump-lxc-321-2021_11_12-04_38_58.tar.lzo' restoring...

I have recently installed four NVMe SSDs in a Proxmox 6 server as a RAIDZ array, only to discover that according to the web interface two of the drives exhibit huge wearout only after a few weeks of use: Since these are among the highest endurance consumer SSDs with 1665 TBW warranty for a...

This looks related to CPU freeze issue that many of us are experiencing when backing up or restoring VMs, that is unresolved for many years: https://forum.proxmox.com/threads/kvm-guests-freeze-hung-tasks-during-backup-restore-migrate.34362 Here is my newly reopened bugreport...

Good point @mmenaz ! Unfortunately none of the new features solved this problem completely, also his observation about this being a load issue is superficial in light of the facts. I have reopened the bugreport and commented our latest experience. I encourage everyone to do the same.

Read my previous posts... this is a several years old bug in the kernel scheduler or KVM (or both), and nobody cares about solving it. Proxmox devs killed my bugreport, KVM devs do not even acknowledge the bugreport. What happens is that during heavy IO load on the host (disk or network), KVM...

This looks exactly like the problem that I (and many others) reported for years in this thread and others. The problem is most likely a Linux kernel / KVM issue. What seems to happen is when local disks are busy due to a restore operation, probably the dirty page IO of the host system is...

Do you boot from ZFS on your server that reboots without any warning? Also, what is your software+hardware configuration? (processor, memory, disks, filesystem, swap, etc.)