Cluster Management Concepts; Powering Off A Node Without Interrupting Cluster Services; Managing A Cluster In A Degraded Condition - Compaq 112726-001 - ProLiant - 6500 Administrator's Manual

6-2 Compaq Parallel Database Cluster Model PDC/O2000 for Oracle8i and Windows 2000 Administrator Guide

Cluster Management Concepts

Powering Off a Node Without Interrupting
Cluster Services

Managing a Cluster in a Degraded Condition

At some time during the life of your cluster you will need to perform an
operation on a cluster node that will require it to be powered off. Physically
moving the cluster node, removing a hardware device, and adding a hardware
device commonly require the node to be powered off.
It is a good practice to gracefully shut down the node before powering it off.
The process of gracefully shutting down a node in a PDC/O2000 can be
summarized as:
1. Make sure that clients connecting to the database through the node can
reconnect to the database through one of the other nodes.
2. Properly shutdown the Oracle instance running on the node.
3. Shut down the server.
The node can now be powered off safely. The database will remain accessible
since the remaining cluster nodes are operating normally.
Due to the high availability benefits of clustering, applications and network
clients remain operational even while some cluster components do not. When
the cluster enters a degraded condition, it is helpful to follow this
troubleshooting process:
1. Determine what caused the degradation.
2. Determine whether the condition affects one cluster node, multiple
cluster nodes, or all cluster nodes.
If one or more nodes is unaffected by the condition, and if enough
performance can be obtained from the unaffected nodes, continue
operating the database.
3. Determine whether the condition will continue to worsen.