we are running NTA 4.2.3 and we want to migrate the OS to 2016 server and upgrade it to 4.4. we're waiting to renew our licenses and hopefully to upgrade everything to 2020 version.
High Availability does not support making the Fastbit database server redundant. You will either need to upgrade to a later version of NTA where the flow storage is in MSSQL, or create a Windows Failover Cluster to make the Fastbit database server redundant.
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