逻辑卷管理（LVM）

1、命令一般，对于物理机新插入的磁盘，或者虚拟机新建的磁盘，先用fdisk /dev/sdb命令创建分区。创建好一个分区/dev/sdb1之后，继续物理卷。1、创建物理卷pvcreate /dev/sdb1pvdisplay显示已建的物理卷2、创建卷组vgcreate vgtest(卷组名) /dev/sdb1vgdisplay3、创建逻辑卷lvcrea

长烟慢慢

2167人浏览 · 2014-02-20 10:25:27

长烟慢慢 · 2014-02-20 10:25:27 发布

1、命令

一般，对于物理机新插入的磁盘，或者虚拟机新建的磁盘，先用fdisk /dev/sdb命令创建分区。创建好一个分区/dev/sdb1之后，继续物理卷。

1、创建物理卷
pvcreate /dev/sdb1
pvdisplay显示已建的物理卷
2、创建卷组
vgcreate vgtest(卷组名) /dev/sdb1
vgdisplay
3、创建逻辑卷
lvcreate -L 600M(卷的大小) -n lvtest(卷名) vgtest
lvdisplay

4、建立挂载
mkdir /u01
vi /etc/fstab
/dev/vgtest/lvtest /u01 ext3 defaulte

5、文件格式化
mkfs.ext3 /dev/vgtest/lvtest

扩展逻辑卷大小
lvextend -L 1G(扩展到1G)/dev/vgtest/lvtest
resize2fs /dev/vgtest/lvtest 文件系统同步

缩减逻辑卷大小
umount
e2fscheck -f /dev/vgtest/lvtest
resize2fs /dev/vgtest/lvtest 800M(缩减到800M)
lvreduce -L 800M /dev/vgtest/lvtest
mount

将新硬盘加入逻辑卷
1、建立物理卷
2、扩展至卷组
vgextend vgtest /dev/sda10

撤出硬盘
pvmove vgtest /dev/sda10
vgreduce vgtest /dev/sda10

以上是关于LVM的一些操作

2、实例

from: http://bbs.chinaunix.net/thread-3613556-1-1.html

试验环境:
vmware下,centos6,64位版本,原来系统默认分区,/dev/sda3是LogVol01,挂载到/上.新添加一个30G的硬盘sdb,将新加的硬盘容量扩充到原来的/上去.

试验步骤:

1.sdb分区,只分一个sdb1
2.在sdb1上创建pv

pvcreate /dev/sdb1

复制代码

显示下pv的情况

[root@localhost ~]# pvdisplay
  --- Physical volume ---
  PV Name             /dev/sda3
  VG Name             VolGroup
   PV Size             18.80 GiB / not usable 3.00 MiB
  Allocatable          yes (but full)
  PE Size             4.00 MiB
  Total PE             4813
  Free PE             0
  Allocated PE       4813
  PV UUID             r3DcdH-tavS-z0dy-bTcg-F5fz-F8MF-dpAjW3

   "/dev/sdb1" is a new physical volume of "30.00 GiB"
  --- NEW Physical volume ---
  PV Name             /dev/sdb1
  VG Name
PV Size             30.00 GiB
  Allocatable          NO
  PE Size             0
  Total PE             0
  Free PE             0
  Allocated PE       0
  PV UUID             1Ynxmw-JblF-XAeE-ZKGD-0BSV-s7BL-SU1mql

3.查看系统现在vg的情况

[root@localhost ~]# vgdisplay
  --- Volume group ---
  VG Name             VolGroup
  System ID
  Format             lvm2
  Metadata Areas       1
  Metadata Sequence No  3
  VG Access          read/write
  VG Status          resizable
  MAX LV             0
  Cur LV             2
  Open LV             2
  Max PV             0
  Cur PV             1
  Act PV             1
   VG Size             18.80 GiB
  PE Size             4.00 MiB
  Total PE             4813
  Alloc PE / Size    4813 / 18.80 GiB
  Free  PE / Size    0 / 0
  VG UUID             Xdh5kq-vKjk-nroE-Dssd-mi1h-SQGK-R07tOn

4.扩容vg

vgextend VolGroup /dev/sdb1

复制代码

正常会提示:Volume group "VolGroup" successfully extended

5.检查下扩容后vg的情况

[root@localhost ~]# vgdisplay
  --- Volume group ---
  VG Name             VolGroup
  System ID
  Format             lvm2
  Metadata Areas       2
  Metadata Sequence No  4
  VG Access          read/write
  VG Status          resizable
  MAX LV             0
  Cur LV             2
  Open LV             2
  Max PV             0
  Cur PV             2
  Act PV             2
   VG Size             48.80 GiB
  PE Size             4.00 MiB
  Total PE             12492
  Alloc PE / Size    4813 / 18.80 GiB
  Free  PE / Size    7679 / 30.00 GiB
  VG UUID             Xdh5kq-vKjk-nroE-Dssd-mi1h-SQGK-R07tOn

6.查看下系统lv的情况

[root@localhost ~]# lvdisplay
  --- Logical volume ---
  LV Name             /dev/VolGroup/LogVol01
  VG Name             VolGroup
  LV UUID             IUVeUw-2bmN-mm3H-Gh16-fKaR-choS-IfSosr
  LV Write Access       read/write
  LV Status             available
  # open                1
   LV Size             16.80 GiB
  Current LE          4301
  Segments             1
  Allocation          inherit
  Read ahead sectors    auto
  - currently set to    256
  Block device          253:0

  --- Logical volume ---
  LV Name             /dev/VolGroup/LogVol00
  VG Name             VolGroup
  LV UUID             U9WYdb-xAdg-tCe1-FPxo-UyVe-v5Gp-a8UlZR
  LV Write Access       read/write
  LV Status             available
  # open                1
  LV Size             2.00 GiB
  Current LE          512
  Segments             1
  Allocation          inherit
  Read ahead sectors    auto
  - currently set to    256
  Block device          253:1

7.扩容lv

[root@localhost ~]# lvextend /dev/VolGroup/LogVol01 /dev/sdb1
Extending logical volume LogVol01 to 46.80 GiB
Logical volume LogVol01 successfully resized

8.检查下扩容后的lv

[root@localhost ~]# lvdisplay
  --- Logical volume ---
  LV Name             /dev/VolGroup/LogVol01
  VG Name             VolGroup
  LV UUID             IUVeUw-2bmN-mm3H-Gh16-fKaR-choS-IfSosr
  LV Write Access       read/write
  LV Status             available
  # open                1
LV Size             46.80 GiB
  Current LE          11980
  Segments             2
  Allocation          inherit
  Read ahead sectors    auto
  - currently set to    256
  Block device          253:0

  --- Logical volume ---
  LV Name             /dev/VolGroup/LogVol00
  VG Name             VolGroup
  LV UUID             U9WYdb-xAdg-tCe1-FPxo-UyVe-v5Gp-a8UlZR
  LV Write Access       read/write
  LV Status             available
  # open                1
  LV Size             2.00 GiB
  Current LE          512
  Segments             1
  Allocation          inherit
  Read ahead sectors    auto
  - currently set to    256
  Block device          253:1

9.现在系统的分区情况如下,/没有扩容

[root@localhost ~]# df -h
文件系统             容量  已用  可用已用%% 挂载点
/dev/mapper/VolGroup-LogVol01
                     17G  8.3G  7.5G  53% /
tmpfs                499M    0  499M 0% /dev/shm
/dev/sda1          194M 25M  159M  14% /boot

10.将/扩容

[root@localhost ~]# resize2fs /dev/mapper/VolGroup-LogVol01
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/mapper/VolGroup-LogVol01 is mounted on /; on-line resizing required
old desc_blocks = 2, new_desc_blocks = 3
Performing an on-line resize of /dev/mapper/VolGroup-LogVol01 to 12267520 (4k) blocks.
The filesystem on /dev/mapper/VolGroup-LogVol01 is now 12267520 blocks long.

11.扩容后分区的情况

[root@localhost ~]# df -h
文件系统             容量  已用  可用已用%% 挂载点
/dev/mapper/VolGroup-LogVol01
                     47G  8.3G 36G  19% /
tmpfs                499M    0  499M 0% /dev/shm
/dev/sda1          194M 25M  159M  14% /boot

可以看到 /分区已经成功的从18G+,扩充到了47G

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