2. Key Concepts for Hardware Service Providers
3. Key Concepts for System Administrators and Application Developers
Cluster Configuration Repository (CCR)
Device IDs and DID Pseudo Driver
Local and Global Namespaces Example
Using the cldevice Command to Monitor and Administer Disk Paths
Using Oracle Solaris Cluster Manager to Monitor Disk Paths
Using the clnode set Command to Manage Disk Path Failure
Adhering to Quorum Device Requirements
Adhering to Quorum Device Best Practices
Recommended Quorum Configurations
Quorum in Two-Host Configurations
Quorum in Greater Than Two-Host Configurations
Atypical Quorum Configurations
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 and Resource Group States and Settings
Resource and Resource Group Properties
Support for Oracle Solaris Zones
Support for Global-Cluster Non-Voting Nodes (Solaris Zones) Directly Through the RGM
Criteria for Using Support for Solaris Zones Directly Through the RGM
Requirements for Using Support for Solaris Zones Directly Through the RGM
Additional Information About Support for Solaris Zones Directly Through the RGM
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
Data Service Project Configuration
Determining Requirements for Project Configuration
Setting Per-Process Virtual Memory Limits
Two-Host Cluster With Two Applications
Two-Host 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
Time between all Oracle Solaris hosts in a cluster must be synchronized. Whether you synchronize the cluster hosts 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 hosts.
In general, a change in the system clock of a fraction of a second causes no problems. However, if you run date, rdate, or xntpdate (interactively, or within cron scripts) 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 host, you have an opportunity to change the default time and date setting for the host. In general, you can accept the factory default.
When you install Oracle Solaris Cluster software by using the scinstall command, one step in the process is to configure NTP for the cluster. Oracle Solaris Cluster software supplies a template file, ntp.cluster (see /etc/inet/ntp.cluster on an installed cluster host), that establishes a peer relationship between all cluster hosts. One host is designated the “preferred” host. Hosts are identified by their private host names and time synchronization occurs across the cluster interconnect. For instructions about how to configure the cluster for NTP, see Chapter 2, Installing Software on Global-Cluster Nodes, in Oracle Solaris Cluster Software Installation Guide.
Alternately, you can set up one or more NTP servers outside the cluster and change the ntp.conf file to reflect that configuration.
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.