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HDFS + what is the recommended minimum disks per data nodes

HDFS + what is the recommended minimum disks per data nodes

 

hi all

 

 

according to the following link

 

https://docs.cloudera.com/documentation/enterprise/release-notes/topics/hardware_requirements_guide....

 

we can see that cloudera recommended min  4 disks per data-node

 

why is the min 4 disks and not 2 disks ?

 

what are the conclusions to set min 4 disks ?

 

 

 

 

 

 

 

Michael-Bronson