10.1.2 Prerequisites for cluster use
JP1/Service Support runs in the logical host environment of a cluster system, and supports failover. As the prerequisites for JP1/Service Support that runs in a logical host environment, the cluster software must normally control assignment and deletion of the shared disk and logical IP address and monitoring of behavior.
- Note:
-
Even if JP1/Service Support supports a cluster software program, that program might not satisfy the prerequisites described here. This depends on the system configuration and environment settings. Therefore, consider the system configuration and environment settings to make sure that the cluster software can satisfy the prerequisites.
- Organization of this subsection
(1) Prerequisites for a logical host environment
If you run JP1/Service Support in a logical host environment, the following prerequisites regarding the logical IP address and shared disk must be satisfied.
Component of a logical host |
Prerequisites |
---|---|
|
|
|
If the conditions in Table 10-1 are not satisfied, a problem might occur in JP1/Service Support operations. For example, the following problems might occur:
-
If the data written by the active node becomes corrupted when a failover occurs:
JP1/Service Support will incur problems, such as errors, data missing, or failure of startup, and will not operate normally.
-
If recovery processing is not done in response to a failure of a LAN board:
Communication errors will occur and JP1/Service Support will not operate normally until the LAN board is switched by the cluster software or other control methods, or a failover occurs to switch the server to another server.
(2) Prerequisites for a physical host environment
In a cluster system in which JP1/Service Support is used on a logical host, the physical host environment for each server must satisfy the following prerequisites.
Component of a physical host |
Prerequisites |
---|---|
Servers |
|
Network |
|
OS and cluster software |
|
(3) The scope supported by JP1/Service Support
If you use JP1/Service Support on a logical host of a cluster system, the scope controlled by JP1/Service Support is only the behavior of JP1/Service Support itself. The control of the logical host environment (the shared disk and logical IP address) and the trigger to start and stop JP1/Service Support depend on the control of the cluster software.
If the above prerequisites for the logical and physical host environments are not satisfied, or if the control of the logical host environment has a problem, problems in the behavior of JP1/Service Support are not supported. In this case, resolve the problem by using the cluster software that controls the logical host environment or by using the OS.