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fdisk tells you this:

Disk /dev/vda: 171.8GB


Your problem is that this disk has two small partitions: vda2 is a 7GB physical volume containing the root logical volume, and vda1 the 1GB boot partition. The rest of vda is free.

I don't know whether it is Nova or your image that determines how the disk is partitioned. There might be ways to influence the partitioning at instance launch time, but if so I don't know how.

To use the remaining space on your running instance, you could either create another physical volume or increase the size of vda2 and use pvresize to adapt the physical volume size.

Here is somebody with the same problem. Googling for openstack instance disk partition gives you more such results.