CentOS磁盘扩容lvm
发布时间：2014-09-05 14:01:13作者：知识屋
安装的Centos的LVM空间减少的很快，没多久就不够用了，好多人使用的是Gparted扩容，命令行不好用，图形界面的Gparted在CentOS6.4上面找不到；有人使用Gparted-Live盘，感觉非常的麻烦，其实Linux本身提供了强大而又简单的扩容工具，非常的容易：
0：当前磁盘情况:
[root@CentOS ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_centos-lv_root 5.5G 4.9G 375M 93% /
tmpfs 499M 320K 498M 1% /dev/shm
/dev/sda1 485M 56M 404M 13% /boot
tmpfs 499M 0 499M 0% /tmp/ram
1：查看要添加的硬盘，显示是/dev/sdb：
[root@CentOS ~]# fdisk -l
Disk /dev/sda: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000d0b56
Device Boot Start End Blocks Id System
/dev/sda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 64 1045 7875584 8e Linux LVM
Disk /dev/sdb: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
.....:
2：初始化准备新增的磁盘：
[root@CentOS ~]# pvcreate /dev/sdb
Physical volume "/dev/sdb" successfully created
3：把新增的磁盘添加到LVM：
[root@CentOS ~]# vgextend vg_centos /dev/sdb
Volume group "vg_centos" successfully extended
4：查看增加磁盘后的LVM：
[root@CentOS ~]# vgdisplay -v vg_centos
Using volume group(s) on command line
Finding volume group "vg_centos"
--- Volume group ---
VG Name vg_centos
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 15.50 GiB
PE Size 4.00 MiB
Total PE 3969
Alloc PE / Size 1922 / 7.51 GiB
Free PE / Size 2047 / 8.00 GiB //这里显示还有多少空间可用，就是新增的磁盘空间
VG UUID 6sYdCf-fA3g-Tyjz-lwfr-2hxP-lnFx-eVaMWj
--- Logical volume ---
LV Path /dev/vg_centos/lv_root
LV Name lv_root
VG Name vg_centos
LV UUID jjByYP-BlFO-O70G-eYd9-Eupx-wqgS-AB2NNT
LV Write Access read/write
LV Creation host, time CentOS.Host1, 2013-08-01 11:33:27 +0800
LV Status available
# open 1
LV Size 5.54 GiB
Current LE 1418
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
--- Logical volume ---
LV Path /dev/vg_centos/lv_swap
LV Name lv_swap
VG Name vg_centos
LV UUID eT8hdT-CbSj-5Kjx-1lyo-2Ru6-nB5o-fJ0HKU
LV Write Access read/write
LV Creation host, time CentOS.Host1, 2013-08-01 11:33:29 +0800
LV Status available
# open 1
LV Size 1.97 GiB
Current LE 504
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
--- Physical volumes ---
PV Name /dev/sda2
PV UUID mEQ0cK-I0ja-45yS-fRqy-19Ds-0dr7-1CNFcx
PV Status allocatable
Total PE / Free PE 1922 / 0
PV Name /dev/sdb
PV UUID 03e2Sl-hFVn-NrNr-eHfB-LeuY-D9P0-rSbv0P
PV Status allocatable
Total PE / Free PE 2047 / 2047
5：扩大逻辑卷（像windows扩大逻辑卷一样）：
[root@CentOS ~]# lvextend -L +7.9G /dev/vg_centos/lv_root
Rounding size to boundary between physical extents: 7.90 GiB
Extending logical volume lv_root to 13.44 GiB
Logical volume lv_root successfully resized
6：查看扩容后的LVM
[root@CentOS ~]# vgdisplay -v vg_centos
Using volume group(s) on command line
Finding volume group "vg_centos"
--- Volume group ---
VG Name vg_centos
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 5
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 15.50 GiB
PE Size 4.00 MiB
Total PE 3969
Alloc PE / Size 3945 / 15.41 GiB
Free PE / Size 24 / 96.00 MiB
VG UUID 6sYdCf-fA3g-Tyjz-lwfr-2hxP-lnFx-eVaMWj
--- Logical volume ---
LV Path /dev/vg_centos/lv_root
LV Name lv_root
VG Name vg_centos
LV UUID jjByYP-BlFO-O70G-eYd9-Eupx-wqgS-AB2NNT
LV Write Access read/write
LV Creation host, time CentOS.Host1, 2013-08-01 11:33:27 +0800
LV Status available
# open 1
LV Size 13.44 GiB
Current LE 3441
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
--- Logical volume ---
LV Path /dev/vg_centos/lv_swap
LV Name lv_swap
VG Name vg_centos
LV UUID eT8hdT-CbSj-5Kjx-1lyo-2Ru6-nB5o-fJ0HKU
LV Write Access read/write
LV Creation host, time CentOS.Host1, 2013-08-01 11:33:29 +0800
LV Status available
# open 1
LV Size 1.97 GiB
Current LE 504
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
--- Physical volumes ---
PV Name /dev/sda2
PV UUID mEQ0cK-I0ja-45yS-fRqy-19Ds-0dr7-1CNFcx
PV Status allocatable
Total PE / Free PE 1922 / 0
PV Name /dev/sdb
PV UUID 03e2Sl-hFVn-NrNr-eHfB-LeuY-D9P0-rSbv0P
PV Status allocatable
Total PE / Free PE 2047 / 24
6：文件系统扩容（注意，这点必须做，因为上面只是空间扩容）
[root@CentOS ~]# resize2fs /dev/vg_centos/lv_root
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/vg_centos/lv_root is mounted on /; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 1
Performing an on-line resize of /dev/vg_centos/lv_root to 3523584 (4k) blocks.
The filesystem on /dev/vg_centos/lv_root is now 3523584 blocks long.
7：查看最后磁盘情况
[root@CentOS ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_centos-lv_root 14G 5.0G 7.7G 40% /
tmpfs 499M 320K 498M 1% /dev/shm
/dev/sda1 485M 56M 404M 13% /boot
tmpfs 499M 0 499M 0% /tmp/ram
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