The customer is using ODF storage for their Virtual Machines in Openshift virtualization. Customer is using StorageClass ocs-storagecluster-ceph-rbd-virtualization.

When the PVCs for the VMs use volumeMode ‘Filesystem’, the UI shows the "Used" space correctly, however, when using volumeMode ‘Block’ the "Used" space shown in the console remains in ‘0 B’. 
 
This causes the StorageSystem to report the overall use incorrectly as it is not including the PVCs in Block mode on its calculations.

The volume monitoring is enabled and works as mentioned when in Filesystem mode.

As a workaround, the customer is checking manually the PVC usage using a KCS[1] that shows how to query the csi-vol data using ceph commands.

[1] https://access.redhat.com/solutions/7113065

    1. Create a new VM using volumeMode: Block
    2. Start the VM and write data.
    3. Check the disk usage from the VM console
    4. Check the Openshift UI for the PVC details 
    

    The UI shows "0 B" in "Used"

    The UI should show the actual space used.