Let's say you run out of /vastorage space and you need to expand it.
Can it be done?

I mean I know how to do it in VMware (since it's ext3 based and not LVM, I believe you remove all snapshots, expand the disk in vmware and use say, GParted to grow the disk or something similar).

But does filr need to be aware (other than the core OS) that the /vastorage is now increased in size?

I couldn't find anything searching for "filr vastorage" that seemed to answer this.