Linux LVM 创建、删除、扩展

在终端上输入
[BeiGang@localhost~]$fdisk -l
Disk /dev/sdc: 1073 MB, 1073741824 bytes
……
Disk /dev/sdc doesn't contain a valid partition table
4
分区1
[BeiGang@localhost~]$fdisk /dev/sdc
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-130, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-130, default 130): +100M

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
[BeiGang@localhost~]$

5
查看
[BeiGang@localhost~]$fdisk -l
Device Boot Start End Blocks Id System
/dev/sdc1 1 14 112423+ 83 Linux

6
分区2
[BeiGang@localhost~]$fdisk /dev/sdc
n
p
2
15
+100M
w

7
查看
[BeiGang@localhost~]$fdisk -l
Device Boot Start End Blocks Id System
/dev/sdc1 1 14 112423+ 83 Linux
/dev/sdc2 15 28 112455 83 Linux

8
添加物理卷
[BeiGang@localhost~]$pvcreate /dev/sdc1
Writing physical volume data to disk "/dev/sdc1"
Physical volume "/dev/sdc1" successfully created
[BeiGang@localhost~]$pvcreate /dev/sdc2
Writing physical volume data to disk "/dev/sdc2"
Physical volume "/dev/sdc2" successfully created
[BeiGang@localhost~]$

9
查看PV
[BeiGang@localhost~]$pvs
PV VG Fmt Attr PSize PFree
/dev/sdc1 lvm2 a-- 109.79m 109.79m
/dev/sdc2 lvm2 a-- 109.82m 109.82m
[BeiGang@localhost~]$

10
创建卷组
[BeiGang@localhost~]$vgcreate VG1 /dev/sdc1 /dev/sdc2
Volume group "VG1" successfully created
[BeiGang@localhost~]$

11
查看卷组
[BeiGang@localhost~]$vgs
VG #PV #LV #SN Attr VSize VFree
VG1 2 0 0 wz--n- 216.00m 216.00m
[BeiGang@localhost~]$

12
创建逻辑卷1
[BeiGang@localhost~]$lvcreate -n lv1 -L +50M VG1
Rounding up size to full physical extent 52.00 MiB
Logical volume "lv1" created
[BeiGang@localhost~]$

13
创建逻辑卷2，因为是PE（4M）的整数倍，所以没有上调
[BeiGang@localhost~]$lvcreate -n lv2 -L +60M VG1
Logical volume "lv2" created
[BeiGang@localhost~]$

14
查看逻辑卷
[BeiGang@localhost~]$lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
lv1 VG1 -wi-a- 52.00m
lv2 VG1 -wi-a- 60.00m
[BeiGang@localhost~]$

15
格式化lv1时报找不到该文件，
[BeiGang@localhost~]$mkfs.ext3 /dev/VG1/lv1

16
挂载lv1
[BeiGang@localhost~]$mount /dev/VG1/lv1 /seconddisk/

17
在文件夹seconddisk上生成文件
[BeiGang@localhost~]$touch /seconddisk/{1..9}.txt
[BeiGang@localhost~]$ll /seconddisk/
total 23
-rw-r--r--. 1 root root 0 Nov 8 14:06 1.txt
-rw-r--r--. 1 root root 0 Nov 8 14:06 2.txt
-rw-r--r--. 1 root root 0 Nov 8 14:06 3.txt
-rw-r--r--. 1 root root 0 Nov 8 14:06 4.txt
-rw-r--r--. 1 root root 0 Nov 8 14:06 5.txt
-rw-r--r--. 1 root root 0 Nov 8 14:06 6.txt
-rw-r--r--. 1 root root 0 Nov 8 14:06 7.txt
-rw-r--r--. 1 root root 0 Nov 8 14:06 8.txt
-rw-r--r--. 1 root root 0 Nov 8 14:06 9.txt
drwx------. 2 root root 12288 Nov 8 13:51 lost+found
[BeiGang@localhost~]$

18
删除/dev/VG1/lv1，/dev/VG1/lv2
[BeiGang@localhost~]$lvremove /dev/VG1/lv1
Can't remove open logical volume "lv1"
[BeiGang@localhost~]$umount /seconddisk/
[BeiGang@localhost~]$lvremove /dev/VG1/lv1
Do you really want to remove active logical volume lv1? [y/n]: y
Logical volume "lv1" successfully removed
[BeiGang@localhost~]$
[BeiGang@localhost~]$lvremove /dev/VG1/lv2
Do you really want to remove active logical volume lv2? [y/n]: y
Logical volume "lv2" successfully removed

19
删除/dev/VG1
[BeiGang@localhost~]$vgremove /dev/VG1
Volume group "VG1" successfully removed
[BeiGang@localhost~]$

20
删除物理卷
[BeiGang@localhost~]$pvremove /dev/sdc3
Labels on physical volume "/dev/sdc3" successfully wiped
[BeiGang@localhost~]$pvremove /dev/sdc2
Labels on physical volume "/dev/sdc2" successfully wiped
[BeiGang@localhost~]$pvremove /dev/sdc1
Labels on physical volume "/dev/sdc1" successfully wiped
[BeiGang@localhost~]$


值得说的一点是在做LVM时，文件类型不必是8e，83也可，具体见下面的Id。
[BeiGang@localhost~]$fdisk -l
Device Boot Start End Blocks Id System
/dev/sdc1 1 14 112423+ 83 Linux
/dev/sdc2 15 28 112455 83 Linux


===================
===================
===================
下面再在上面第17步完成后的基础上再对lv2做一个扩展。
1
首先fdisk搞一个/dev/sdc3
查看：
[BeiGang@localhost~]$ fdisk -l | grep /sdb
/dev/sdc1 1 14 112423+ 83 Linux
/dev/sdc2 15 28 112455 83 Linux
/dev/sdc3 29 42 112455 83 Linux

2
增加pv失败
[BeiGang@localhost~]$ pvcreate /dev/sdc3
Device /dev/sdc3 not found (or ignored by filtering).

3
加载disc partation：
[BeiGang@localhost~]$ partx -a /dev/sdc
BLKPG: Device or resource busy
error adding partition 1
BLKPG: Device or resource busy
error adding partition 2
[BeiGang@localhost~]$ partx -a /dev/sdc
BLKPG: Device or resource busy
error adding partition 1
BLKPG: Device or resource busy
error adding partition 2
BLKPG: Device or resource busy
error adding partition 3

4
增加pv：
[BeiGang@localhost~]$ pvcreate /dev/sdc3
Writing physical volume data to disk "/dev/sdc3"
Physical volume "/dev/sdc3" successfully created

5
扩展sdb3到vg：
[BeiGang@localhost~]$ vgextend /dev/VG1 /dev/sdc3
Volume group "VG1" successfully extended
[BeiGang@localhost~]$

6
查看VG：
[BeiGang@localhost~]$ vgs
VG #PV #LV #SN Attr VSize VFree
VG1 3 1 0 wz--n- 324.00m 272.00m
VolGroup 1 2 0 wz--n- 19.51g 0

查看LV：
[BeiGang@localhost~]$ lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
lv2 VG1 -wi-a- 52.00m

7
扩展lv
[BeiGang@localhost~]$ lvextend -L +50M /dev/VG1/lv2
Rounding up size to full physical extent 52.00 MiB
Extending logical volume lv2 to 104.00 MiB
Logical volume lv2 successfully resized
[BeiGang@localhost~]$

8
查看：
[BeiGang@localhost~]$ lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
lv2 VG1 -wi-a- 104.00m

9
挂载再查看，lv2只有51M，刚才扩展的还没有真正加上
[BeiGang@localhost~]$ mount /dev/VG1/lv2 /mnt
[BeiGang@localhost~]$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VG1-lv2
51M 4.9M 43M 11% /mnt
[BeiGang@localhost~]$

10
再resize一下：
[BeiGang@localhost~]$ resize2fs /dev/VG1/lv2

11
再df查看：
[BeiGang@localhost~]$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VG2-lv2 101M 5.3M 91M 6% /mnt
[BeiGang@localhost~]$