LVM系列3

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wdy198622 2015-12-25 18:51:06 博主文章分类：Linux系统

文章标签 LVM 文章分类 运维

转自

http://asdic.iteye.com/blog/321935

Linux 扩展LVM下的Volume Group、Logical Volume

通过扩展Volume Group、Logical Volume来达到扩展文件系统的大小，

我的服务器是建在虚机上的，

分配硬盘空间时，通过修改参数把原来硬盘加大的。

[root@localhost ~]# fdisk -l

Disk /dev/sda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id System
/dev/sda1   *           1          13      104391   83 Linux
/dev/sda2              14        1044     8281507+ 8e Linux LVM

先创建物理分区

#fdisk /dev/sda

通n键，创建一个主分区；

通t键，输入8e转换为LVM分区

w键，写入分区表

Disk /dev/sda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id System
/dev/sda1   *           1          13      104391   83 Linux
/dev/sda2              14        1044     8281507+ 8e Linux LVM
/dev/sda3            1045        3916    23069340   8e Linux LVM

重启生效，然后创建物理卷(physical volume)

#pvcreate /dev/sda3

Physical volume "/dev/sda3" successfully created

查看现有的vg

#vgdisplay

--- Volume group ---
VG Name               VolGroup00
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               7.88 GB
PE Size               32.00 MB
Total PE              252
Alloc PE / Size       250 / 7.81 GB
Free PE / Size       2 / 64.00 MB
VG UUID               Zv74Nv-kqbn-SpF3-yBcg-brXn-2X0G-5mbJcx

通过vgextend命令扩展现有的vg

#vgextend VolGroup00 /dev/sda3

Volume group "VolGroup00" successfully extended

#vgdisplay

--- Volume group ---
VG Name               VolGroup00
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               29.88 GB
PE Size               32.00 MB
Total PE              956
Alloc PE / Size       250 / 7.81 GB
Free PE / Size       706 / 22.06 GB
VG UUID               Zv74Nv-kqbn-SpF3-yBcg-brXn-2X0G-5mbJcx

#mount

/dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw)
none on /proc type proc (rw)
none on /sys type sysfs (rw)
none on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/sda1 on /boot type ext3 (rw)
none on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)

可以看到文件系统的 / 是挂载在/dev/mapper/VolGroup00-LogVol00上的，

因此，通过改变lv LogVol00的大小来达到给/增减空间的目的。

# lvscan
ACTIVE '/dev/VolGroup00/LogVol00' [5.88 GB] inherit
ACTIVE '/dev/VolGroup00/LogVol01' [1.94 GB] inherit

通过lvresize命令扩展Logical Volume

# lvresize -L +22.06G /dev/VolGroup00/LogVol00
Rounding up size to full physical extent 22.06 GB
Extending logical volume LogVol00 to 27.94 GB
Logical volume LogVol00 successfully resized

调整完后，查看一下文件系统使用情况

#df -h

Filesystem            Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                      5.8G 3.5G 2.1G 63% /
/dev/sda1              99M   14M   81M 14% /boot
none                  506M     0 506M   0% /dev/shm

发现并没有没发生改变

通过ext2online命令在线resize文件系统

#ext2online /dev/mapper/VolGroup00-LogVol00

#df -h

Filesystem            Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                       28G 3.5G   23G 14% /
/dev/sda1              99M   14M   81M 14% /boot
none                  506M     0 506M   0% /dev/shm

大小调整成功！

检查分区

#e2fsck /dev/VolGroup00/LogVol00