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By setting the Cache on the Harddisk from "Default (no cache)" to "Write through" the live migration works now... WTF?!?! So, cool!!! Thanks Udo for the excellent hint! I will try now yet another VM to check if I can reproduce the minimized downtime approach.

Hi Udo, cool suggestion! Tried it... So the filesystem is actually accessible within the VM - but the disk move borks now out with a different error: Online Migration: create full clone of drive scsi1 (netapp03-DS1:111/vm-111-disk-0.raw) drive mirror is starting for drive-scsi1 drive-scsi1...

Seems like the issue with the not working offline copy is the creation of the destination raw file with the wrong size. From the gui: Virtual Environment 5.3-8 Storage 'ceph-proxmox-VMs' on node 'proxmox01' Search: Logs () create full clone of drive scsi0 (netapp03-DS1:111/vm-111-disk-0.vmdk)...

Hi, moving it offline to the final destination also works root@proxmox01:/var/lib/vz/images# /usr/bin/qemu-img convert -p -f vmdk -O raw /mnt/pve/netapp03-DS1/images/111/vm-111-disk-0.vmdk...

Hi, thanks for getting back so quickly! Converting onto same storage: Virtual Environment 5.3-8 Virtual Machine 111 (win2008r2) on node 'proxmox01' Logs scsi0 create full clone of drive scsi0 (netapp03-DS1:111/vm-111-disk-0.vmdk) Formatting...

Hi, tried to move a disk just now with the current ProxMox (5.3-8). Online: Virtual Environment 5.3-8 Virtual Machine 111 (win2008r2) on node 'proxmox01' Logs create full clone of drive ide0 (netapp03-DS1:111/vm-111-disk-0.vmdk) drive mirror is starting for drive-ide0 drive-ide0: transferred...

Hi virtRoo, after starting this thread yesterday I upgraded to 5.3-8. I will try another VM today... I understand that I am moving from one virtualisation platform to another one so I have no problem with a short downtime. But most of my live VMs are rather big and I need some best practise...

Hi, we built a three node ProxMox cluster with Ceph as storage backend for our test VMs. They currently reside on a VMware two node cluster with an old NetApp as storage backend. Plan is to try to migrate/convert - as preparation for a possible migration of our productive VMs - with minimal...