12c Grid Infrastructure diskmon Will be Offline by Default in Non-Exadata Environment

As Grid Infrastructure daemon diskmon.bin is used for Exadata fencing, started from 11.2.0.3, resource ora.diskmon will be offline in non-Exadata environment. This is expected behaviour change.

$ crsctl stat res -t -init
--------------------------------------------------------------------------------
NAME           TARGET  STATE        SERVER                   STATE_DETAILS       
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.asm
      1        ONLINE  ONLINE       pricedev1-lnx            Started             
ora.cluster_interconnect.haip
      1        ONLINE  ONLINE       pricedev1-lnx                                
ora.crf
      1        ONLINE  ONLINE       pricedev1-lnx                                
ora.crsd
      1        ONLINE  ONLINE       pricedev1-lnx                                
ora.cssd
      1        ONLINE  ONLINE       pricedev1-lnx                                
ora.cssdmonitor
      1        ONLINE  ONLINE       pricedev1-lnx                                
ora.ctssd
      1        ONLINE  ONLINE       pricedev1-lnx            OBSERVER            
ora.diskmon
      1        OFFLINE OFFLINE                                                   
ora.drivers.acfs
      1        ONLINE  ONLINE       pricedev1-lnx                                
ora.evmd
      1        ONLINE  ONLINE       pricedev1-lnx                                
ora.gipcd
      1        ONLINE  ONLINE       pricedev1-lnx                                
ora.gpnpd
      1        ONLINE  ONLINE       pricedev1-lnx                                
ora.mdnsd
      1        ONLINE  ONLINE       pricedev1-lnx  

Refer:
11.2.0.3 Grid Infrastructure diskmon Will be Offline by Default in Non-Exadata Environment (Doc ID 1346881.1)