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Chapter 16 # R recovery The restoration of system operation to full capacity or partial capacity. During recovery, a system performs the following tasks: Reassigns resources to restore the system to operational state Repairs any parts that were adversely affected by the failure redundancy The provision of a backup node to take over in the event of failure. The Foundation Services use the 2N redundancy model. See also availability, reliability, and serviceability. relative priority The priority of one of the Foundation Services processes compared to another. In descending order of priority, the Foundation Services daemons have the following relative priority: `nhpmd` > `nhwdtd` > `nhprobed`> `nhcmmd` > `nhcrfsd` > `nhnsmd`. See also actual priority and base priority. reliability The measure of continuous system uptime. See also availability, redundancy, and serviceability. Reliable Boot Service A service that uses the Dynamic Host Configuration Protocol (DHCP) and the other Foundation Services to ensure the boot of diskless nodes regardless of software failures or hardware failures. Reliable NFS A service that provides a mounted file system to make data on the master node accessible to other cluster nodes. Reliable NFS mirrors disk-based data on the master node to the vice-master node, and reconfigures the floating address triplet after failover or switchover. replication The copying of data from the master node to the vice-master node. Through replication, the vice-master node keeps an up-to-date copy of the data on the master node. See also synchronization. role A membership role allocated by the Cluster Membership Manager. See also in node, out node, master node, and vice-master node.
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