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Oracle Solaris Cluster Concepts Guide Oracle Solaris Cluster 4.1 |
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Oracle Solaris Cluster Concepts Guide Oracle Solaris Cluster 4.1 |
2. Key Concepts for Hardware Service Providers
3. Key Concepts for System Administrators and Application Developers
Device IDs and DID Pseudo Driver
Cluster Configuration Repository (CCR)
Using the cldevice Command to Monitor and Administer 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-Node Configurations
Quorum in Greater Than Two-Node 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 Zones on 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
Data Service Project Configuration
Determining Requirements for Project Configuration
Setting Per-Process Virtual Memory Limits
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
The Oracle Solaris Cluster software mechanism that enables global devices is the global namespace. The global namespace includes the /dev/global/ hierarchy as well as the volume manager namespaces. The global namespace reflects both multihost disks and local disks (and any other cluster device, such as CD-ROMs and tapes). Each cluster node that is physically connected to multihost disks provides a path to the storage for any node in the cluster.
For Solaris Volume Manager, the volume manager namespaces are located in the /dev/md/diskset/dsk (and rdsk) directories. These namespaces consist of directories for each Solaris Volume Manager disk set imported throughout the cluster.
In the Oracle Solaris Cluster software, each device host in the local volume manager namespace is replaced by a symbolic link to a device host in the /global/.devices/node@nodeID file system. nodeID is an integer that represents the nodes in the cluster. Oracle Solaris Cluster software continues to present the volume manager devices, as symbolic links, in their standard locations as well. Both the global namespace and standard volume manager namespace are available from any cluster node.
The advantages of the global namespace include the following:
Each host remains fairly independent, with little change in the device administration model.
Third-party generated device trees are still valid and continue to work.
Given a local device name, an easy mapping is provided to obtain its global name. For more information, see the scdidadm(1M) man page.
The following table shows the mappings between the local and global namespaces for a multihost disk, c0t0d0s0.
Table 3-2 Local and Global Namespace Mappings
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The global namespace is automatically generated on installation and updated with every reconfiguration reboot. You can also generate the global namespace by using the cldevice command. See the cldevice(1CL) man page.
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