Understand the dfsclusterhealth informations

[#1]

Hello,

The dfsclusterhealth view of the namenodes is givin me the folowing informations:

Total Files And Directories	:	64340
Configured Capacity	:	1.88 TB
DFS Used	:	2.21 TB
Non DFS Used	:	120.56 GB
DFS Remaining	:	674.13 GB
DFS Used%	:	117.57%
DFS Remaining%	:	34.96%

How can the DFS used be bigger than the configured capacity?

What is the difference?

Thank you,

[#2 · Accepted solution]

I believe that's because of replication. 2.21 TB refers to the amount of space taken up by the data you've stored plus the space taken up by all the replicas of that data. 1.88 TB refers to the amount of data you can store, accounting for the fact that HDFS will need space to make replicas.