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Unable to communicate with node alerts after upgrade to StorageGRID 12.0

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Applies to

Netapp StorageGRID 12.0

Issue

After upgrading to 12.0 frequent "Unable to communicate with node" alerts appear due to "miscd" service not responding.
Additionally a number Cassandra related alerts may appear, see  KB Various_cassandra_related_alerts_and_diagnostic_statuses_after_upgrading_to_12.0 

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