我在vmware workstation中使用cloudera manager 5.4.1实现了2节点集群，其中包括hbase、impala、hive、sqoop2、oozie、zookeeper、namenode、secondaryname和yarn等组件。我已经模拟了每个节点3个磁盘驱动器，包括操作系统的sda、hadoop存储的sdb和sdc。
因为我已经在每个节点上为hadoop存储分配了16gb的sdb1和16gb的sdc1。因此，我假设包括两个节点在内的hdfs存储的总容量应该是64gb。但是当使用dfsadmin命令和namenodeui检查输出时，我看到“配置的容量小于为hdfs分配的原始磁盘大小”。我在下面显示了dfsadmin命令的输出，也显示了df-h的输出。请帮助我了解为什么配置的容量显示小于我的原始磁盘大小？

[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