203 votesplanned · AdminAzure IaaS Engineering Team (Azure IaaS Engineering Team, Microsoft, Microsoft Azure) responded
Currently you can increase the size of a disk when the VM is in the stop-deallocated state. We are also working on a solution where a disk can be increased in size while attached to a running VM.Toni Benamar commented
Does this work under Linux (Ubuntu, ext4 filesystem), i.e. can I safely allocate very large disk and assume that I will be billed for used space only?