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is it possible to decrease datanode/workers disks

hi all

we installed from scratch ambari-cluster with 3 masters machine and 3 worker machine - ( datanode machine )

each datanode machine have 4 disk

so current datanode directories are:

/gr/sdb/hadoop/hdfs/data,/gr/sdc/hadoop/hdfs/data,/gr/sdd/hadoop/hdfs/data,/gr/sde/hadoop/hdfs/data,<br>

so it is possible to configure now - one disk only per worker machine instead of 4 ?

if yes what are the blueprint parmaeters / ambari parmaters that we need to change in the ambari GUI?

Michael-Bronson