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Hypothetical scenario: I have a 5 node THOR cluster.. And I want to make it to 6 node. What is the least disruptive way to do it?

1. Do we have to bring down the cluster?

Yes as of current it requires a restart of all components including DALI.  

2. Once we add the node, can we send a command to automatically re-partition the data or what is the best way to utilize the 6th node?

Redistribution is not automatic although you don't necessarily have to redistribute.  Any old file would reside in 5 parts, new files in 6 parts.  You can redistribute the old data but it would require ECL jobs with the redistribute option.
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