Using SNAplus2 in a High Availability Environment

Using SNAplus2 with MC/ServiceGuard

Assuming the applications attempt to activate a new LU-LU session when they lose the LU-LU session they were using, you simply need to wait for the migration to occur. The applications require no restart ing because they run on client systems. The set of commands needed to start HALS on the backup server are listed. Once the backup server reactivates HALS, the applications will again be able to obtain LU-LU sessions.

SNAplus2 Package

To integrate SNAplus2 into your ServiceGuard cluster, an SNAplus2 package must be defined. Defining an SNAplus2 package tells ServiceGuard that the SNAplus2 software on the HP 9000 server must be highly available, and access to the SNA network is mission critical. Defining an SNAplus2 package will allow ServiceGuard to do the following:

•Automatically start the SNAplus2 software when the SNAplus2 package starts

•Automatically start a process to monitor the state of the SNAplus2 software on the server

•Automatically migrate the SNAplus2 package to a backup server if the package ever fails to provide SNA network connectivity

ServiceGuard will monitor the health of the SNAplus2 package, and migrate the package to another server if it should ever fail to provide SNA network connectivity.

Several configuration steps are involved in defining packages. Follow the ServiceGuard product documentation for planning and beginning the package definition. ServiceGuard allows you to create a package using SAM or using HP-UX commands and editors. The following suggestions will help you create your SNAplus2 ServiceGuard package.

368

Appendix D