What is network heartbeat ? what is disk heartbeat ?

What is network heartbeat ? what is disk heartbeat ? where these information stored (Voting Disk)? where can we see the log files if there is network/disk heartbeat failure. Is there any OS packages available that need to be installed ?
Thanks in advance

voting = disk heartbeat
Network private interconnect = Heartbeat
=
logs are in CRS log directory

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    Time for Change: Migrate your Non-RAC Database to RAC
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