Configuration Considerations - Red Hat Cluster for Enterprise Linux 5 Configuration

Command Line Used With
Tool
— Cluster Infra-
ccs_tool
Cluster Configur- structure
ation System
Tool
— Cluster Infra-
cman_tool
Cluster Manage- structure
ment Tool
— Cluster Infra-
fence_tool
Fence Tool structure
— High-availability
clustat
Cluster Status Service Manage-
Utility ment Compon-
ents
— High-availability
clusvcadm
Cluster User Service Manage-
Service Adminis- ment Compon-
tration Utility ents
Table 1.1. Command Line Tools

5. Configuration Considerations

You can configure a Red Hat Cluster in a variety of ways to suit your needs. Take into account
the following considerations when you plan, configure, and implement your Red Hat Cluster.
No-single-point-of-failure hardware configuration
Clusters can include a dual-controller RAID array, multiple bonded network channels, mul-
tiple paths between cluster members and storage, and redundant un-interruptible power
supply (UPS) systems to ensure that no single failure results in application down time or
loss of data.
Alternatively, a low-cost cluster can be set up to provide less availability than a no-
single-point-of-failure cluster. For example, you can set up a cluster with a single-controller
RAID array and only a single Ethernet channel.
5. Configuration Considerations
Purpose
is a program for making online updates to the
ccs_tool
cluster configuration file. It provides the capability to
create and modify cluster infrastructure components
(for example, creating a cluster, adding and removing a
node). For more information about this tool, refer to the
ccs_tool(8) man page.
is a program that manages the CMAN cluster
cman_tool
manager. It provides the capability to join a cluster,
leave a cluster, kill a node, or change the expected
quorum votes of a node in a cluster. For more informa-
tion about this tool, refer to the cman_tool(8) man page.
is a program used to join or leave the de-
fence_tool
fault fence domain. Specifically, it starts the fence dae-
mon ( ) to join the domain and kills
fenced
leave the domain. For more information about this tool,
refer to the fence_tool(8) man page.
The command displays the status of the
clustat
cluster. It shows membership information, quorum view,
and the state of all configured user services. For more
information about this tool, refer to the clustat(8) man
page.
The command allows you to enable, disable,
clusvcadm
relocate, and restart high-availability services in a
cluster. For more information about this tool, refer to the
clusvcadm(8) man page.
11
to
fenced