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Oracle Solaris Cluster Concepts Guide     Oracle Solaris Cluster 4.0
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Document Information


1.  Introduction and Overview

2.  Key Concepts for Hardware Service Providers

3.  Key Concepts for System Administrators and Application Developers

Administrative Interfaces

Cluster Time

Campus Clusters

High-Availability Framework

Global Devices

Device IDs and DID Pseudo Driver

Zone Cluster Membership

Cluster Membership Monitor

Failfast Mechanism

Cluster Configuration Repository (CCR)

Device Groups

Device Group Failover

Device Group Ownership

Global Namespace

Local and Global Namespaces Example

Cluster File Systems

Using Cluster File Systems

HAStoragePlus Resource Type

syncdir Mount Option

Disk Path Monitoring

DPM Overview

Monitoring Disk Paths

Using the cldevice Command to Monitor and Administer Disk Paths

Using the clnode set Command to Manage Disk Path Failure

Quorum and Quorum Devices

About Quorum Vote Counts

About Quorum Configurations

Adhering to Quorum Device Requirements

Adhering to Quorum Device Best Practices

Recommended Quorum Configurations

Quorum in Two-Node Configurations

Quorum in Greater Than Two-Node Configurations

Load Limits

Data Services

Data Service Methods

Failover Data Services

Scalable Data Services

Load-Balancing Policies

Failback Settings

Data Services Fault Monitors

Developing New Data Services

Characteristics of Scalable Services

Data Service API and Data Service Development Library API

Using the Cluster Interconnect for Data Service Traffic

Resources, Resource Groups, and Resource Types

Resource Group Manager (RGM)

Resource and Resource Group States and Settings

Resource and Resource Group Properties

Support for Oracle Solaris Zones

Support for Solaris Zones on Oracle Solaris Cluster Nodes Through Oracle Solaris Cluster HA for Solaris Zones

Criteria for Using Oracle Solaris Cluster HA for Solaris Zones

Requirements for Using Oracle Solaris Cluster HA for Solaris Zones

Additional Information About Oracle Solaris Cluster HA for Solaris Zones

Service Management Facility

System Resource Usage

System Resource Monitoring

Control of CPU

Viewing System Resource Usage

Data Service Project Configuration

Determining Requirements for Project Configuration

Setting Per-Process Virtual Memory Limits

Failover Scenarios

Two-Node Cluster With Two Applications

Two-Node Cluster With Three Applications

Failover of Resource Group Only

Public Network Adapters and IP Network Multipathing

SPARC: Dynamic Reconfiguration Support

SPARC: Dynamic Reconfiguration General Description

SPARC: DR Clustering Considerations for CPU Devices

SPARC: DR Clustering Considerations for Memory

SPARC: DR Clustering Considerations for Disk and Tape Drives

SPARC: DR Clustering Considerations for Quorum Devices

SPARC: DR Clustering Considerations for Cluster Interconnect Interfaces

SPARC: DR Clustering Considerations for Public Network Interfaces


Cluster Time

Time among all cluster nodes in a cluster must be synchronized. Whether you synchronize the cluster nodes with any outside time source is not important to cluster operation. The Oracle Solaris Cluster software employs the Network Time Protocol (NTP) to synchronize the clocks between nodes.

In general, a change in the system clock of a fraction of a second causes no problems. However, if you run date or rdate on an active cluster, you can force a time change much larger than a fraction of a second to synchronize the system clock to the time source. This forced change might cause problems with file modification timestamps or confuse the NTP service.

When you install the Oracle Solaris Operating System on each cluster node, you have an opportunity to change the default time and date setting for the node. In general, you can accept the factory default.

When you install Oracle Solaris Cluster software using the scinstall command, the software supplies template files (see /etc/inet/ntp.conf and /etc/inet/ on an installed cluster node) that establish a peer relationship between all cluster nodes. One node is designated the “preferred” node. Nodes are identified by their private host names and time synchronization occurs across the cluster interconnect. Examples of private host names include clusternode1-priv and clusternode2-priv. For instructions on how to configure NTP, see Configuring Network Time Protocol (NTP) in Oracle Solaris Cluster Software Installation Guide.

In normal operation, you should never need to adjust the time on the cluster. However, if the time was set incorrectly when you installed the Oracle Solaris Operating System and you want to change it, the procedure for doing so is included in Chapter 9, Administering the Cluster, in Oracle Solaris Cluster System Administration Guide.