[ceph-users] Can rbd sparsify be run on a running VM's disk?

Question: Can rbd sparsify safely be run on a running VM's disk, in Ceph 19/Squid? Or must the VM be shut down first? I tried looking online but am not finding a direct answer. More info: I'm looking into why "rbd du" shows usage inconsistent with "ceph df" or Proxmox's "usage" displays (Proxmox thread<https://forum.proxmox.com/threads/ceph-rbd-du-shows-usage-2-4x-higher-than-inside-vm.181348/>). Sparsify on a stopped VM reduces "rbd du" usage, and the number of objects, but doesn't change the amount of space used according to Ceph and PVE. I am wondering if sparsify can be safely scripted. Or if I should just ignore "rbd du" USED amounts. Thanks.