[Users] how to temporarily solve low disk space problem preventing start of VM

Hello, test cluster with two nodes and GlusterFS DC on f19 and 3.3.2, using gluster version 3.4.2 from f19 updates-testing repo. Unfortunately I have only small local disk quite occupied by existing VMs. About 4Gb free. I had VMs started and then I shutdown them. Trying to power on any VM I get: Error while executing action: c6s: Cannot run VM. Low disk space on target Storage Domain gvdata. On SPM node (node02) that is the only one active I have: /dev/mapper/fedora-DATA_GLUSTER 30G 23G 7.8G 75% /gluster/DATA_GLUSTER node01.mydomain:gvdata 30G 26G 4.6G 85% /rhev/data-center/mnt/glusterSD/node01.mydomain:gvdata Can I tweak this low disk warning in any way? How does engine make this kind of check? Thanks in advance Gianluca