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Using SNAplus2 in a High Availability Environment
Using SNAplus2 with MC/ServiceGuard
Some of the reasons that ServiceGuard works well with SNAplus2 in a
high availability environment are as follows:
1. ServiceGuard is designed for general software resiliency. This means
that ServiceGuard packages can easily be built for SNAplus2 .
2. The automatic recovery capabilities of ServiceGuard complement the
built-in high availability features of SNAplus2 .
3. SNAplus2 can take advantage of the standard monitoring and
management tools provided by ServiceGuard which makes detecting
problems and reacting to those problems a much simpler and quicker
process.
Creating the HA SNAplus2 Package
In order to configure SNAplus2 for high availability, you must complete
several steps.
Step 1. Install and configure your S erviceGuard cluster
Step 2. Install and configure other high availability products
Step 3. Identify your critical SNAplus2 connectivity (see the next section for
details)
Step 4. Install SNAplus2 on the primary server and all backup servers
Step 5. Create and configure your SNAplus2 package
Follow the ServiceGuard product documentation to install and configure
disk hardware, volume groups, logical volumes, and file systems for high
availability. In addition, ServiceGuard documentation explain s how to
set up your LAN for high availability.
Identifying Critical SNAplus2 Connectivity
Before attempting to create your SNAplus2 package, define the paths
through your network that provide SNA connectivity for the users of
your SNAplus2 software. Provide at least two paths per application that
you wish to make highly available. Identify at least two SNAplus2
servers that can provide SNA network connectivity in your ServiceGuard
cluster. Consequently, if one server experiences a failure that prevents it
from providing SNA network connectivity, another server can take over
that role. Follow these steps to help you build your SNAplus2 package:
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Appendix D
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