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The peer nodes all report the results of their operations back to the DC and, based on the expected and actual results, will either execute any actions that needed to wait for the previous one to complete, or abort processing and ask the PEngine to recalculate the ideal cluster state based on the unexpected results.
In Pacemaker, STONITH devices are modeled as resources (and configured in the CIB) to enable them to be easily monitored for failure, however STONITHd takes care of understanding the STONITH topology such that its clients simply request a node be fenced, and it does the rest.
The CIB uses XML to represent both the cluster’s configuration and current state of all resources in the cluster.
The contents of the CIB are automatically kept in sync across the entire cluster and are used by the PEngine to compute the ideal state of the cluster and how it should be achieved. Pacemaker centralizes all cluster decision making by electing one of the CRMd instances to act as a master.
Ignoring a box labeled 'Important' will not cause data loss but may cause irritation and frustration.
If you have a suggestion for improving the documentation, try to be as specific as possible when describing it.
For example: Note the words in bold italics above — username, domain.name, file-system, package, version and release.
Should the elected CRMd process (or the node it is on) fail, a new one is quickly established.
The DC carries out the PEngine’s instructions in the required order by passing them to either the Local Resource Management daemon (LRMd) or CRMd peers on other nodes via the cluster messaging infrastructure (which in turn passes them on to their LRMd process).
The purpose of this document is to definitively explain the concepts used to configure Pacemaker.
To achieve this, it will focus exclusively on the XML syntax used to configure Pacemaker's Cluster Information Base (CIB).
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