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I suggest to change the glance mechanism from "Saving to files" to "Clustered RBD Mode" in this way you will need to install CEPH and add some HDDs all around your Servers and cluster every spare disks together this need refactoring the architecture but brings lots of flexibility with itself for example in your case instead of moving data from a disk to another or to mount a bigger hard disk you will install ceph client and install a separated storage servers in your server farm which are responsible for delivering the storage service.

you can have a look at the link below: ceph & glance configuration

Have in mind you should have active + clean state in ceph cluster.