I have implemented 2 node cluster using Cloudera Manager 5.4.1 in VMWare workstation and this includes components like Hbase, Impala, Hive, Sqoop2, Oozie, Zookeeper, NameNode, SecondaryName and YARN. I have simulated 3 disk drives per node which includes sda for OS , sdb & sdc for Hadoop storage.
As I had allocated sdb1 having 16GB and sdc1 having 16GB dedicated for Hadoop storage on each of the nodes. Hence I assume that my total capacity for HDFS storage including both nodes should be 64GB. But when checked the output using dfsadmin command and also using NameNode UI, I see that the "Configured Capacity is lesser than my original disk size allocated for HDFS". I have shown the output of dfsadmin command below and also output of df -h is shown. Kindly help me understand why the Configured capacity is showing lesser than my original disk size ?
[hduser@node1 ~]$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_node1-LogVol00 40G 15G 23G 39% /
tmpfs 3.9G 76K 3.9G 1% /dev/shm
/dev/sda1 388M 39M 329M 11% /boot
/dev/sdb1 16G 283M 15G 2% /disks/disk1/hdfsstorage/dfs
/dev/sdc1 16G 428M 15G 3% /disks/disk2/hdfsstorage/dfs
/dev/sdb2 8.1G 147M 7.9G 2% /disks/disk1/nonhdfsstorage
/dev/sdc2 8.1G 147M 7.9G 2% /disks/disk2/nonhdfsstorage
cm_processes 3.9G 5.8M 3.9G 1% /var/run/cloudera-scm-agent/process
[hduser@node1 ~]$
[hduser@node1 zookeeper]$ sudo -u hdfs hdfs dfsadmin -report
[sudo] password for hduser:
Configured Capacity: 47518140008 (44.25 GB)
Present Capacity: 47518140008 (44.25 GB)
DFS Remaining: 46728742571 (43.52 GB)
DFS Used: 789397437 (752.83 MB)
DFS Used%: 1.66%
Under replicated blocks: 385
Blocks with corrupt replicas: 0
Missing blocks: 0
Missing blocks (with replication factor 1): 0
-------------------------------------------------
Live datanodes (2):
Name: 192.168.52.111:50010 (node1.example.com)
Hostname: node1.example.com
Rack: /default
Decommission Status : Normal
Configured Capacity: 23759070004 (22.13 GB)
DFS Used: 394702781 (376.42 MB)
Non DFS Used: 0 (0 B)
DFS Remaining: 23364367223 (21.76 GB)
DFS Used%: 1.66%
DFS Remaining%: 98.34%
Configured Cache Capacity: 121634816 (116 MB)
Cache Used: 0 (0 B)
Cache Remaining: 121634816 (116 MB)
Cache Used%: 0.00%
Cache Remaining%: 100.00%
Xceivers: 2
Last contact: Sun May 15 18:15:33 IST 2016
Name: 192.168.52.112:50010 (node2.example.com)
Hostname: node2.example.com
Rack: /default
Decommission Status : Normal
Configured Capacity: 23759070004 (22.13 GB)
DFS Used: 394694656 (376.41 MB)
Non DFS Used: 0 (0 B)
DFS Remaining: 23364375348 (21.76 GB)
DFS Used%: 1.66%
DFS Remaining%: 98.34%
Configured Cache Capacity: 523239424 (499 MB)
Cache Used: 0 (0 B)
Cache Remaining: 523239424 (499 MB)
Cache Used%: 0.00%
Cache Remaining%: 100.00%
Xceivers: 2
Last contact: Sun May 15 18:15:32 IST 2016
