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It's not clear what you're asking. It sounds like you are comparing server failover functionality with log shipping functionality.
Your ITSA reference, is that making reference to DB2 HADR? Your RH pacemaker functionality would be different, and more comparable to IBM's PowerHA (but for non-POWER platforms).
In such a case, SP does not *really* integrate with any cluster. The clusters do their own thing. It's up to the cluster software developer, and the system engineers at the customer site, to set up any sort of system failover functionality.
Usually, a cluster has shared disk where possible. When doing a database role reversal, your scripts would need to stop the app (dsmserv), make sure the db2sysc is down, etc etc, and then run the commands for a role reversal if the new active node is an HADR standby. How you do this would depend on a lot of factors, but this seems more like an ask for Red Hat than for Spectrum Protect.
Red Hat article 3172731 seems to be relevant.