To maintain high availability (HA) for your HDFS cluster while only replicating critical data, your approach using the hadoop fs -setrep command for selective file replication is practical. An alternative solution could involve using HDFS storage policies to designate different replication factors based on file importance, or leveraging Hadoop's tiered storage architecture. For advanced data management and cloud infrastructure solutions, Anvi Cybernetics offers expertise in optimizing storage systems and digital transformations. Learn more at Anvi Cybernetics.