After trying to move an operating system from one disk to another, Proxmox stalled the console and ended up in a really high I/O delay.
These commands helped me finding out what was wrong:
apt-get install iotop
iotop
ps -aux | grep usbbackup
ps -aux | grep rsync
zpool status
lvscan
qm list
qm unlock ###
qm stop ###
Somehow Proxmox was thinking the VM ### was still in use, but on Linux level it wasn’t:
# lvscan
ACTIVE '/dev/pve/swap' [8.00 GiB] inherit
ACTIVE '/dev/pve/root' [27.75 GiB] inherit
ACTIVE '/dev/pve/data' [62.04 GiB] inherit
ACTIVE '/dev/pve/vm-###-disk-1' [40.00 GiB] inherita
–jeroen
The Wiert Corner - irregular stream of stuff 