One workaround that comes to my mind is to power up the VM, write a large file and delete it and run fstrim -av.

Another approach is to create an additional LV inside the guest, use dd to fill it in and then blkdiscard and delete the LV .

It will force the fisk to be fully allocated 

Best Regards,

Strahil Nikolov

Thanks Arik,

Is there a fix that can be applied to current versions as 4.5 release and subsequent testing/approval is some way off/

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