resource mail {
   meta-disk               internal;
   device                  minor 1;

   on host1 {
     address               ipv4 192.168.42.1:7858;
     disk                    "/dev/system/mail";
     }
   on host2 {
     address               ipv4 192.168.42.1:7858;
     disk                    "/dev/system/mail";
     }
 }