Centos6.5调整同一VG下两个LV空间

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实验目的:

调整前

lv_root分区大小为50G

Lv_home分区大小为45G

 

调整后(将lv_home分区减少30G,将30G空间加到lv_root分区)

lv_root分区大小为80G

Lv_home分区大小为15G

 

操作前注意备份重要数据

1     查看磁盘使用情况

[[email protected] ~]# df –h

Filesystem                  Size  Used Avail Use% Mounted on

/dev/mapper/vg_lvm-lv_root   50G  769M   46G   2% /

tmpfs                       1.9G     0  1.9G   0% /dev/shm

/dev/sda1                   485M   33M  427M   8% /boot

/dev/mapper/vg_lvm-lv_home   45G  180M   43G   1% /home

2     卸载/home

[[email protected] ~]# umount /home

[[email protected] ~]# df -h

Filesystem                  Size  Used Avail Use% Mounted on

/dev/mapper/vg_lvm-lv_root   50G  769M   46G   2% /

tmpfs                       1.9G     0  1.9G   0% /dev/shm

/dev/sda1                   485M   33M  427M   8% /boot

注意:umount /home 如果提示无法卸载,则是有进程占用/home,使用如下命令来终止占用进程:

[[email protected] ~]# fuser -m /home

3     调整lv_home分区大小

[[email protected] ~]# resize2fs -p /dev/mapper/vg_lvm-lv_home 15G

resize2fs 1.41.12 (17-May-2010)

Please run 'e2fsck -f /dev/mapper/vg_lvm-lv_home' first.

[[email protected] ~]# e2fsck -f /dev/mapper/vg_lvm-lv_home

e2fsck 1.41.12 (17-May-2010)

Pass 1: Checking inodes, blocks, and sizes

Pass 2: Checking directory structure

Pass 3: Checking directory connectivity

Pass 4: Checking reference counts

Pass 5: Checking group summary information

/dev/mapper/vg_lvm-lv_home: 12/2992416 files (0.0% non-contiguous), 233858/11962368 blocks

[[email protected] ~]# resize2fs -p /dev/mapper/vg_lvm-lv_home 15G

resize2fs 1.41.12 (17-May-2010)

Resizing the filesystem on /dev/mapper/vg_lvm-lv_home to 3932160 (4k) blocks.

Begin pass 2 (max = 32769)

Relocating blocks             XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Begin pass 3 (max = 366)

Scanning inode table          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Begin pass 4 (max = 6)

Updating inode references     XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

The filesystem on /dev/mapper/vg_lvm-lv_home is now 3932160 blocks long.

注:resize2fs 为重新设定磁盘大小,只是重新指定一下大小,并不对结果有影响,需要下面lvreduce的配合

4     挂载/home查看使用情况

[[email protected] ~]# mount /dev/mapper/vg_lvm-lv_home /home

[[email protected] ~]# df -h

Filesystem                  Size  Used Avail Use% Mounted on

/dev/mapper/vg_lvm-lv_root   50G  769M   46G   2% /

tmpfs                       1.9G     0  1.9G   0% /dev/shm

/dev/sda1                   485M   33M  427M   8% /boot

/dev/mapper/vg_lvm-lv_home   15G  168M   14G   2% /home

5     设置空闲空间

使用lvreduce指令用于减少LVM逻辑卷占用的空间大小。可能会删除逻辑卷上已有的数据,所以在操作前必须进行确认。记得输入 “y

[[email protected] ~]# lvreduce -L 15G /dev/mapper/vg_lvm-lv_home

WARNING: Reducing active and open logical volume to 15.00 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 15.00 GiB

  Logical volume lv_home successfully resized

注:lvreduce -L 15G的意思为设置当前文件系统为15G,如果lvreduce –l 15G是指从当前文件系统上减少15G

使用lvreduce减小逻辑卷的大小。注意:减小后的大小不能小于文件的大小,否则会丢失数据。 

可以使用vgdisplay命令等查看一下可以操作的大小。也可以是用fdisk -l命令查看详细信息。

[[email protected] ~]# vgdisplay

--- Volume group ---

  VG Name               vg_lvm

  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               99.51 GiB

  PE Size               4.00 MiB

  Total PE              25474

  Alloc PE / Size       17632 / 68.88 GiB

  Free  PE / Size       7842 / 30.63 GiB

  VG UUID               NOS2vP-0HRm-eh9K-cHx1-ZnOS-45CA-SOvjGz

注:vgdisplay为显示LVM卷组的元数据信息

 

6     把闲置空间添加到lv_root

[[email protected] ~]# df -h

Filesystem                  Size  Used Avail Use% Mounted on

/dev/mapper/vg_lvm-lv_root   50G  769M   46G   2% /

tmpfs                       1.9G     0  1.9G   0% /dev/shm

/dev/sda1                   485M   33M  427M   8% /boot

/dev/mapper/vg_lvm-lv_home   15G  168M   14G   2% /home

[[email protected] ~]# lvextend -L +30G /dev/mapper/vg_lvm-lv_root

Extending logical volume lv_root to 80.00 GiB

  Logical volume lv_root successfully resized

注:lvextend -L +30G为在文件系统上增加30G

[[email protected] ~]# resize2fs -p /dev/mapper/vg_lvm-lv_root

执行后需要等待几分钟才能显示执行结果

resize2fs 1.41.12 (17-May-2010)

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

old desc_blocks = 4, new_desc_blocks = 5

Performing an on-line resize of /dev/mapper/vg_lvm-lv_root to 20971520 (4k) blocks.

The filesystem on /dev/mapper/vg_lvm-lv_root is now 20971520 blocks long.

7     查看调整结果

[[email protected] ~]# df -h

Filesystem                  Size  Used Avail Use% Mounted on

/dev/mapper/vg_lvm-lv_root   79G  773M   74G   2% /

tmpfs                       1.9G     0  1.9G   0% /dev/shm

/dev/sda1                   485M   33M  427M   8% /boot

/dev/mapper/vg_lvm-lv_home   15G  168M   14G   2% /home

 


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