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How to Calculate disk Space for namenode logfiles retention??

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How to Calculate disk Space for namenode logfiles retention??

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I checked with the cloudera documentation, default is 200MB multipled by 10 files, default is 2GB diskpace, If i want to meet requirement 30 gb of five logfiles retention for namenode. As per the cloudera documentation logic in calculation of disk space requirement for logfiles should be 6GB multiplied by 5 logfiles =30gb. Correct me if  i am wrong.  is it  best way to fix it. tips and tricks are welcomed. Thanks in advance