'freenas' not online

Hai, I'm New use proxmox, and i have proxmox cluster in proxmox 4.1 with 4 node and 1 NAS / freenas storage, i'm install vm on NFS partition on pve4 or Node 4, some time i try restart freenas and node 4 simultaneously and the first lit node 4 while still offline vm can't start up and when...