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ISE Cluster Application Restart downtime

tsgruu2000
Level 1
Level 1

We have to allow SHA1 in ISE. This causes an application restart and therefore we expect a downtime of 10-15 minutes of each node.
The deployment consists of 2 admin nodes and 2 PSNs. Are both PSN nodes restarted at the same time or is there an order like when installing a patch? If both go down will definitely need a maintenance window to perform this change.