我的真正目标是从Hadoop群集中清除现有节点，声明空间等，然后重新安装另一个发行版。
下面是空间描述。其中一个主（namenode）：
df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg00-root
2.0G 739M 1.2G 39% /
tmpfs 24G 0 24G 0% /dev/shm
/dev/mapper/mpathap1 194M 65M 120M 36% /boot
/dev/mapper/vg00-home
248M 12M 224M 5% /home
/dev/mapper/vg00-nsr 248M 11M 226M 5% /nsr
/dev/mapper/vg00-opt 3.1G 79M 2.8G 3% /opt
/dev/mapper/vg00-itm 434M 11M 402M 3% /opt/IBM/ITM
/dev/mapper/vg00-tmp 2.0G 68M 1.9G 4% /tmp
/dev/mapper/vg00-usr 2.0G 1.6G 305M 85% /usr
/dev/mapper/vg00-usr_local
248M 11M 226M 5% /usr/local
/dev/mapper/vg00-var 2.0G 820M 1.1G 43% /var
/dev/mapper/vg00-FSImage
917G 3.3G 867G 1% /opt/hadoop-FSImage
/dev/mapper/vg00-Zookeeper
917G 200M 870G 1% /opt/hadoop-Zookeeper
其中一个 slave （datanodes）（其他人也有4-8个本地磁盘和一些挂载的NFS驱动器）：
df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg00-root
2.0G 411M 1.5G 22% /
tmpfs 36G 0 36G 0% /dev/shm
/dev/mapper/mpathap1 194M 67M 118M 37% /boot
/dev/mapper/vg00-home
248M 11M 226M 5% /home
/dev/mapper/vg00-nsr 248M 11M 226M 5% /nsr
/dev/mapper/vg00-opt 3.1G 82M 2.8G 3% /opt
/dev/mapper/vg00-itm 434M 11M 402M 3% /opt/IBM/ITM
/dev/mapper/vg00-tmp 2.0G 68M 1.9G 4% /tmp
/dev/mapper/vg00-usr 2.0G 1.2G 690M 64% /usr
/dev/mapper/vg00-usr_local
248M 11M 226M 5% /usr/local
/dev/mapper/vg00-var 2.0G 1.5G 392M 80% /var
/dev/mapper/vg00-00 559G 33M 559G 1% /opt/hadoop-00
/dev/mapper/vg00-01 559G 33M 559G 1% /opt/hadoop-01
/dev/mapper/vg00-02 559G 33M 559G 1% /opt/hadoop-02
/dev/mapper/vg00-03 559G 33M 559G 1% /opt/hadoop-03
/dev/mapper/vg00-04 559G 33M 559G 1% /opt/hadoop-04
/dev/mapper/vg00-05 559G 33M 559G 1% /opt/hadoop-05
/dev/mapper/vg00-06 559G 33M 559G 1% /opt/hadoop-06
/dev/mapper/vg00-07 559G 33M 559G 1% /opt/hadoop-07
在新安装期间，我遇到了所有节点/主机的空间问题
Not enough disk space on host (l1032lab.se.com). A minimum of 1GB is required for "/usr" mount. A minimum of 2GB is required for "/" mount.
Not enough disk space on host (l1033lab.se.com). A minimum of 1GB is required for "/usr" mount. A minimum of 2GB is required for "/" mount.
Not enough disk space on host (l1034lab.se.com). A minimum of 1GB is required for "/usr" mount. A minimum of 2GB is required for "/" mount.
Not enough disk space on host (l1035lab.se.com). A minimum of 1GB is required for "/usr" mount. A minimum of 2GB is required for "/" mount.
现在安装在/，/ usr，/ var和/ home安装下需要很多空间，主机和从机都很少，但在这两个磁盘下主机中有很多空间：
/dev/mapper/vg00-FSImage
917G 200M 870G 1% /opt/hadoop-FSImage
/dev/mapper/vg00-Zookeeper
917G 6.5G 864G 1% /opt/hadoop-Zookeeper
以及这8个磁盘下的从属设备。
/dev/mapper/vg00-00 559G 33M 559G 1% /opt/hadoop-00
/dev/mapper/vg00-01 559G 33M 559G 1% /opt/hadoop-01
/dev/mapper/vg00-02 559G 33M 559G 1% /opt/hadoop-02
/dev/mapper/vg00-03 559G 33M 559G 1% /opt/hadoop-03
/dev/mapper/vg00-04 559G 33M 559G 1% /opt/hadoop-04
/dev/mapper/vg00-05 559G 33M 559G 1% /opt/hadoop-05
/dev/mapper/vg00-06 559G 33M 559G 1% /opt/hadoop-06
/dev/mapper/vg00-07 559G 33M 559G 1% /opt/hadoop-07
我对如何继续感到困惑 - 我想知道我是否可以对这些磁盘中的一个或多个进行分区并在/，/ usr等下分配它们并继续进行安装，然后将这些磁盘分区和安装/卸载是否会损坏现有的/，/ usr等安装？