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MCCS refers to heartbeat connection when determine a fault of remote node. If all the heartbeat connection is disconnected from the remote node, it is considered as a failure.
Therefore, redundant heartbeat connection is strongly recommended because failure on heartbeat network can result in node failure.
(Please refer to "Chapter 4. Node" of MCCS Manual " for more details about node state)
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Resource group is a set of resources with dependency and MCCS failover the entire resources in a group.
For example, to manage the ORACLE service by MCCS, IP address that is connected by client, network interface card, disks which database is stored, ORACLE listener and server service must be enclosed by a unit which is called as Group.
Group should be configured as IP address dependent on network interface card, ORACLE server dependent on disk where database is stored, ORACLE listener dependent on ORACLE server to provide proper service.
IP address cannot be assigned without network interface card, process related to ORACLE can be bring online after disk completed online. If there is more than a group defined on a cluster, one group will failover without affecting the other groups.
There are two types, parallel and failover group, according to the service.
Please refer to "Chapter 5. Resource Group" of MCCS Manual " for more details about parallel and failover group.
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