Running exachk on exadata does not do anything

I'm using root to run in an Exadata Machine an exachk, with -a option and does not do anything.  I try -legacy option without any luck.

[root@dbadm01 exachk]# export RAT_TIMEOUT=120
[root@dbadm01 exachk]# export RAT_OUTPUT=/opt/oracle.SupportTools/exachk/output
[root@dbadm01 exachk]# export RAT_COPY_EM_XML_FILES=1
[root@dbadm01 exachk]# export RAT_IBSWITCH_USER=root
[root@dbadm01 exachk]# export RAT_NOCLEAN_DIR=1
[root@dbadm01 exachk]# export RAT_ROOT_TIMEOUT=900
[root@dbadm01 exachk]# export RAT_PASSWORDCHECK_TIMEOUT=100
[root@dbadm01 exachk]# export RAT_TIMEOUT=240
[root@dbadm01 exachk]# ./exachk -a

Sending commands to daemon (mypid 256756) args : -a

Checking ssh user equivalency settings on all nodes in cluster for root