I need to increase the volume of the running VM without poweroff. Is there any possible way to achieve?
AFAIK the live resize of disks will be available in the next release of OpenNebula.
But in general it depends on the resize capabilities of the storage backend.
Please share more info about your setup - OS, storage backend, opennebula version, etc.
OS:centOS7,storage backend: Host storage, opennebula version:5.0.2
So, does the “Host storage” support disk resize while the disk is used(opened by the qemu-kvm process)?