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Expose or change CritRsctProtMethod in RSCT/TSA for Db2 HADR deployments
When deploying Db2 HADR on PureApplication, IBM TSA automatically gets installed and setup to handle the automatic failover of Db2. TSA is built on RSCT, which is configured with a recommended/default CritRsctProtMethod of 3. This default ensures maximum safety, as it allows for the release/unlocking of any shared resources. Refer to the following technote for more details:
However when Db2 HADR is deployed on PureApplication, there are no shared resources that require release/unlocking. Therefore a value of 5 should be considered as the new default. Or even better, the Db2 pattern type should expose the value of CritRsctProtMethod so it can be changed accordingly by the user deploying Db2 HADR.
When TSA performs a failover of Db2 HADR, the default CritRsctProtMethod of 3 triggers a reboot of the VM that no longer acts as Db2 primary. This reboot does not provide any value, asthere is no need to unlock/release any shared resources with Db2 HADR deployed on PureApplication. However it does lead to more disruption at a time when that is best avoided.
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