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离线安装Cloudera Manager 5和CDH5(最新版5.9.3) 完全教程（三）重新分配磁盘空间（可选）

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08/08
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一、查看文件系统

[root@master ~]# df -h

Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_master-lv_root 50G .2G 46G % /
tmpfs 16G 16G % /dev/shm
/dev/sda1 485M 39M 421M % /boot
/dev/mapper/vg_master-lv_home 231G 188M 219G % /home

由于我的HDFS存储目录实在根目录”/”下，因此实际这个节点上的存储空间只有50G，但是可以看出/dev/mapper/vg_master-lv_home下的空间有231G，大量空间没有被使用，因此我的目标是从中你抽取出223G的空间给根目录

二、卸载目录

[root@master ~]# umount /home

三、重新分配存储容量

[root@master ~]# e2fsck -f /dev/mapper/vg_master-lv_home
e2fsck 1.41. (-May-)
第一步: 检查inode,块,和大小
第二步: 检查目录结构
第3步: 检查目录连接性
Pass : Checking reference counts
第5步: 检查簇概要信息
/dev/mapper/vg_master-lv_home: / files (0.0% non-contiguous), / blocks
[root@master ~]# resize2fs -p /dev/mapper/vg_master-lv_home 10G
resize2fs 1.41. (-May-)
Resizing the filesystem on /dev/mapper/vg_master-lv_home to (4k) blocks.
Begin pass (max = )
正在重定位块 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Begin pass (max = )
正在扫描inode表 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
The filesystem on /dev/mapper/vg_master-lv_home is now blocks long.[root@master ~]#

四、重新挂载目录

[root@master ~]# mount /home

五、释放存储空间

将抽出223G空间释放以便重新分配

[root@master ~]# lvreduce -L 10G /dev/mapper/vg_master-lv_home
WARNING: Reducing active and open logical volume to 10.00 GiB
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce lv_home? [y/n]: y
Reducing logical volume lv_home to 10.00 GiB
Logical volume lv_home successfully resized
[root@master ~]#

查看空闲的存储空间

[root@master ~]# vgdisplay
--- Volume group ---
VG Name vg_master
System ID
Format lvm2
Metadata Areas
Metadata Sequence No
VG Access read/write
VG Status resizable
MAX LV
Cur LV
Open LV
Max PV
Cur PV
Act PV
VG Size 299.51 GiB
PE Size 4.00 MiB
Total PE
Alloc PE / Size / 75.74 GiB
Free PE / Size / 223.77 GiB
VG UUID iF3Sxg-QDyY-2zkm-Tg6C-cuF5-UcRc-f7tCAm[root@master ~]#

六、为目标磁盘增加存储

[root@master ~]# lvextend -L +223G /dev/mapper/vg_master-lv_root
Extending logical volume lv_root to 273.00 GiB
Logical volume lv_root successfully resized
[root@master ~]# resize2fs -p /dev/mapper/vg_master-lv_root
resize2fs 1.41. (-May-)
Filesystem at /dev/mapper/vg_master-lv_root is mounted on /; on-line resizing required
old desc_blocks = , new_desc_blocks =
Performing an on-line resize of /dev/mapper/vg_master-lv_root to (4k) blocks.
The filesystem on /dev/mapper/vg_master-lv_root is now blocks long.[root@master ~]#

七、查看文件存储大小

[root@master ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_master-lv_root 269G .2G 254G % /
tmpfs 16G 16G % /dev/shm
/dev/sda1 485M 39M 421M % /boot
/dev/mapper/vg_master-lv_home .9G 164M .2G % /home
[root@master ~]#

1.  查看文件系统

[root@master ~]# df -h

Filesystem                   Size  Used Avail Use% Mounted on

/dev/mapper/vg_master-lv_root   50G  1.2G   46G   3% /

tmpfs                         16G     0   16G   0% /dev/shm

/dev/sda1                    485M   39M  421M   9% /boot

/dev/mapper/vg_master-lv_home  231G  188M  219G   1% /home

[root@master ~]#

由于我的HDFS存储目录实在根目录”/”下，因此实际这个节点上的存储空间只有50G，但是可以看出/dev/mapper/vg_master-lv_home下的空间有231G，大量空间没有被使用，因此我的目标是从中你抽取出223G的空间给根目录

2.  卸载目录

[root@master ~]# umount /home

3.  重新分配存储容量

[root@master ~]# e2fsck -f /dev/mapper/vg_master-lv_home

e2fsck 1.41.12 (17-May-2010)

第一步: 检查inode,块,和大小

第二步: 检查目录结构

第3步: 检查目录连接性

Pass 4: Checking reference counts

第5步: 检查簇概要信息

/dev/mapper/vg_master-lv_home: 11/15327232 files (0.0% non-contiguous), 1009843/61280256 blocks

[root@master ~]# resize2fs -p /dev/mapper/vg_master-lv_home 10G

resize2fs 1.41.12 (17-May-2010)

Resizing the filesystem on /dev/mapper/vg_master-lv_home to 2621440 (4k) blocks.

Begin pass 2 (max = 32768)

正在重定位块            XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Begin pass 3 (max = 1871)

正在扫描inode表          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

The filesystem on /dev/mapper/vg_master-lv_home is now 2621440 blocks long.

[root@master ~]#

4.  重新挂载目录

[root@master ~]# mount /home

5.  释放存储空间

将抽出223G空间释放以便重新分配

[root@master ~]# lvreduce -L 10G /dev/mapper/vg_master-lv_home

WARNING: Reducing active and open logical volume to 10.00 GiB

THIS MAY DESTROY YOUR DATA (filesystem etc.)

Do you really want to reduce lv_home? [y/n]: y

Reducing logical volume lv_home to 10.00 GiB

Logical volume lv_home successfully resized

[root@master ~]#

查看空闲的存储空间

[root@master ~]# vgdisplay

--- Volume group ---

VG Name               vg_master

System ID

Format                lvm2

Metadata Areas        1

Metadata Sequence No  5

VG Access             read/write

VG Status             resizable

MAX LV                0

Cur LV                3

Open LV               3

Max PV                0

Cur PV                1

Act PV                1

VG Size               299.51 GiB

PE Size               4.00 MiB

Total PE              76674

Alloc PE / Size       19390 / 75.74 GiB

Free  PE / Size       57284 / 223.77 GiB

VG UUID               iF3Sxg-QDyY-2zkm-Tg6C-cuF5-UcRc-f7tCAm

[root@master ~]#

6.  为目标磁盘增加存储

[root@master ~]# lvextend -L +223G /dev/mapper/vg_master-lv_root

Extending logical volume lv_root to 273.00 GiB

Logical volume lv_root successfully resized

[root@master ~]# resize2fs -p /dev/mapper/vg_master-lv_root

resize2fs 1.41.12 (17-May-2010)

Filesystem at /dev/mapper/vg_master-lv_root is mounted on /; on-line resizing required

old desc_blocks = 4, new_desc_blocks = 18

Performing an on-line resize of /dev/mapper/vg_master-lv_root to 71565312 (4k) blocks.

The filesystem on /dev/mapper/vg_master-lv_root is now 71565312 blocks long.

[root@master ~]#

查看文件存储大小

[root@master ~]# df -h

Filesystem                   Size  Used Avail Use% Mounted on

/dev/mapper/vg_master-lv_root  269G  1.2G  254G   1% /

tmpfs                         16G     0   16G   0% /dev/shm

/dev/sda1                    485M   39M  421M   9% /boot

/dev/mapper/vg_master-lv_home  9.9G  164M  9.2G   2% /home

[root@master ~]#