Disks do not response after some time in Windows VM

[proximoxi2]

After some time (I guess it happens while doing backups on the host) the disks of the VM do not respond anymore (no read/write at all, 100% active) and everything that requires file io freezes.


Config of the VM

╰─# cat /etc/pve/qemu-server/112.conf                                                                                                                                                                130 ↵
#scsi1%3A local-lvm-ssd%3Avm-112-disk-2,backup=0,cache=unsafe,discard=on,size=1000G,ssd=1
#scsi1%3A local-lvm-ssd%3Avm-112-disk-2,backup=0,cache=unsafe,discard=on,size=1000G,ssd=1
agent: 1
bios: ovmf
boot: order=scsi0;net0;ide2
cores: 16
cpu: host
efidisk0: local-lvm:vm-112-disk-0,efitype=4m,pre-enrolled-keys=1,size=4M
hotplug: disk,network,usb
ide2: local:iso/Win11_22H2_English_x64v2.iso,media=cdrom,size=5705260K
machine: pc-i440fx-5.2
memory: 60000
name: windows-11-leander
net0: virtio=AA:12:90:37:11:CB,bridge=vmbr1,firewall=1,tag=5
numa: 0
ostype: win11
parent: update_ccache
scsi0: local-lvm:vm-112-disk-1,cache=unsafe,discard=on,size=700G,ssd=1
scsi1: local-lvm-hdd:vm-112-disk-0,cache=unsafe,iothread=1,size=500G
scsihw: virtio-scsi-pci
smbios1: uuid=9698e429-cd23-4bdc-a935-19735570f42f
sockets: 1
tpmstate0: local-lvm:vm-112-disk-2,size=4M,version=v2.0
vmgenid: 4251cf57-c43b-4a6b-bf80-ec6098f248bd

# pveversion -v                                                                                                                                                                                    127 ↵
proxmox-ve: 8.2.0 (running kernel: 6.8.8-2-pve)
pve-manager: 8.2.4 (running version: 8.2.4/faa83925c9641325)
proxmox-kernel-helper: 8.1.0
pve-kernel-5.15: 7.4-8
proxmox-kernel-6.8: 6.8.8-2
proxmox-kernel-6.8.8-2-pve-signed: 6.8.8-2
proxmox-kernel-6.8.8-1-pve-signed: 6.8.8-1
proxmox-kernel-6.8.4-3-pve-signed: 6.8.4-3
proxmox-kernel-6.5.13-5-pve-signed: 6.5.13-5
proxmox-kernel-6.5: 6.5.13-5
proxmox-kernel-6.2.16-20-pve: 6.2.16-20
proxmox-kernel-6.2: 6.2.16-20
pve-kernel-5.15.131-1-pve: 5.15.131-2
pve-kernel-5.15.102-1-pve: 5.15.102-1
ceph-fuse: 16.2.11+ds-2
corosync: 3.1.7-pve3
criu: 3.17.1-2
glusterfs-client: 10.3-5
ifupdown2: 3.2.0-1+pmx8
ksm-control-daemon: 1.5-1
libjs-extjs: 7.0.0-4
libknet1: 1.28-pve1
libproxmox-acme-perl: 1.5.1
libproxmox-backup-qemu0: 1.4.1
libproxmox-rs-perl: 0.3.3
libpve-access-control: 8.1.4
libpve-apiclient-perl: 3.3.2
libpve-cluster-api-perl: 8.0.7
libpve-cluster-perl: 8.0.7
libpve-common-perl: 8.2.1
libpve-guest-common-perl: 5.1.3
libpve-http-server-perl: 5.1.0
libpve-network-perl: 0.9.8
libpve-rs-perl: 0.8.9
libpve-storage-perl: 8.2.3
libspice-server1: 0.15.1-1
lvm2: 2.03.16-2
lxc-pve: 6.0.0-1
lxcfs: 6.0.0-pve2
novnc-pve: 1.4.0-3
proxmox-backup-client: 3.2.7-1
proxmox-backup-file-restore: 3.2.7-1
proxmox-firewall: 0.4.2
proxmox-kernel-helper: 8.1.0
proxmox-mail-forward: 0.2.3
proxmox-mini-journalreader: 1.4.0
proxmox-widget-toolkit: 4.2.3
pve-cluster: 8.0.7
pve-container: 5.1.12
pve-docs: 8.2.2
pve-edk2-firmware: 4.2023.08-4
pve-esxi-import-tools: 0.7.1
pve-firewall: 5.0.7
pve-firmware: 3.12-1
pve-ha-manager: 4.0.5
pve-i18n: 3.2.2
pve-qemu-kvm: 9.0.0-6
pve-xtermjs: 5.3.0-3
qemu-server: 8.2.1
smartmontools: 7.3-pve1
spiceterm: 3.3.0
swtpm: 0.8.0+pve1
vncterm: 1.8.0
zfsutils-linux: 2.2.4-pve1

 

[proximoxi2]

And then sometimes windows Crashes. From the Event Log:
```
The previous system shutdown at 21:16:03 on ‎14/‎07/‎2024 was unexpected.
```
and
```
The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
```

 

[_gabriel]

i hope VM isn't critical because "unsafe" cache is dangerous about data, VM think data is written on the disk where there not, unsafe cached data is lost during crash like this.

if you use Proxmox Backup Server, it require fast link and fast writes.
Fleecing new feature can help.

 

[proximoxi2]

No the VM isn't critical. And I turned this off, but it seems after a rollback it was enabled again because it was in the past.

> Fleecing new feature can help.
What do you mean?

 

[Neobin]

> Fleecing new feature can help.
What do you mean?

https://pve.proxmox.com/pve-docs/chapter-vzdump.html#_vm_backup_fleecing