[Users] Cannot start VM

Hi! I built small ovirt cluster with one dedicated node (A) and one node (B) with engine and gluster storage. Test VM succesfuly started at node A, but cannot start at node B. In an engine.log I see error "could not open disk image ... Permission denied". SELinux disabled on both nodes. All nodes on Centos 6 with ovirt 3.3.2-1.el6. Could you help me? P.S. Node B also runs a few VM's, not managed by ovirt with disks in lvm-volumes.