Online disk resize with Qemu/KVM and Ceph

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Hi,

I'm making a environment for VMs with qemu/kvm and Ceph using RBD, and I'm with the follow problem: The guest VM not recognizes disk resize (increase). The cenario is:

Host:
Centos 7.6
Libvirt 4.5
Ceph 13.2.4

I follow the following steps to increase the disk (ex: disk 10Gb  to 20Gb):

# rbd resize --size 20480 mypool/vm_test
# virsh blockresize --domain vm_test --path vda --size 20G

But after this steps, the disk in VM continue with original size. For apply the change, is necessary reboot VM. 
If I use local datastore instead Ceph, the VM recognize new size imediatally.

Does anyone have this?  Is this expected?
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