Calculation of HBASE Size after test run

[Narayan]

Hi,
I was using HDFS+HBASE. I have created a database and ran a test for 2 hours. I want to check the increase in size of the database after test run.
I have tried to take readings using:
hadoop dfsadmin -report and
hadoop fs -dus /hbase.
Also tried to check the disk size using du -sk /HADOOP.

Observation is after the test is run, the size shows decreased instead of increasing.

Versions being used : Hadoop 1.0.0, HBase 0.90.5 , ZooKeeper 3.3.4.
Compression on Column family is NONE.

Please help in getting the correct process to calculate the increase in DB size due to test.

Thanks
L.L.Narayan