Linux分区----------物理卷-----------卷组-----------逻辑卷
1.创建分区（fdisk /dev/sdx）
2.同步分区（partprobe） //这两步简单我就直接略过
3.创建物理卷
[root@localhost ~]# pvcreate /dev/sda8 /dev/sda9 /dev/sda10
Physical volume "/dev/sda8" successfully created
Physical volume "/dev/sda9" successfully created
Physical volume "/dev/sda10" successfully created
查询：pvdisplay
4.创建卷组
[root@localhost ~]# vgcreate vg01 /dev/sda8 /dev/sda9 /dev/sda10
Volume group "vg01" successfully created
如果需要指定PE的大小则用-s选项
[root@localhost ~]# vgcreate vg01 -s 8M /dev/sda8 /dev/sda9 /dev/sda10 //指定PE的大小为8M
查询：vgdisplay
5.创建逻辑卷
[root@localhost ~]# lvcreate -L 100M vg01 -n lv01 //-L直接指定分区的大小
Logical volume "lv01" created
[root@localhost ~]# lvcreate -l 50 -n lv01 vg01 //-l指定PE的个数
查询：lvdisplsy
6.格式化分区
#mkfs.ext3 /dev/vg01/lv01
7.挂载（步骤简单，此处略去。。）
8.扩展卷组
首先我们去创建一个新的分区，转换成物理卷
[root@localhost ~]# pvcreate /dev/sda11
Physical volume "/dev/sda11" successfully created
[root@localhost ~]# vgextend vg01 /dev/sda11
Volume group "vg01" successfully extended
[root@localhost ~]#
可以看到，vg01被成功的扩展。
9.扩展逻辑卷（例如原来是100M，增加50M）
[root@localhost ~]# lvextend -L 150M /dev/vg01/lv01 //或者： lvextend -L +50M /dev/vg01/lv01
Rounding up size to full physical extent 152.00 MB
Extending logical volume lv01 to 152.00 MB
Logical volume lv01 successfully resized
有个很重要的地方，虽然我们用lvdisplay看到逻辑卷的确被扩展到150MB但用df –h查看到，我们逻辑卷的大小还是100MB。
现在有条命令可以解决这个问题
这条命令的作用就是将逻辑卷的大小拉升到挂载点上面，不需离线操作
[root@localhost ~]# resize2fs /dev/vg01/lv01
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/vg01/lv01 is mounted on /mnt/lvm; on-line resizing required
Performing an on-line resize of /dev/vg01/lv01 to 155648 (1k) blocks.
The filesystem on /dev/vg01/lv01 is now 155648 blocks long.
10.减小卷组(将一个物理卷从卷组中T出去)
[root@localhost ~]# vgreduce vg01 /dev/sda11
Removed "/dev/sda11" from volume group "vg01"
11.减小逻辑卷(减小到300M)
减小逻辑卷必须离线，必须卸载
#umount /mnt/lvm 卸载
#e2fsck –f /dev/vg01/lv01 扫描
#resize2fs /dev/vg01/lv01 300M 减小文件系统
#lvreduce -L 300M /dev/vg01/lv01 减小逻辑卷
12删除LVM（删除的时候是倒着删除，先删除lv再删除vg在删除pv）
删除lvm
[root@localhost ~]# lvremove /dev/vg01/lv01
Do you really want to remove active logical volume lv01? [y/n]: y
Logical volume "lv01" successfully removed
删除vg
[root@localhost ~]# vgremove vg01
Volume group "vg01" successfully removed
删除pv
[root@localhost ~]# pvremove /dev/sda8 /dev/sda9 /dev/sda10
Labels on physical volume "/dev/sda8" successfully wiped
Labels on physical volume "/dev/sda9" successfully wiped
Labels on physical volume "/dev/sda10" successfully wiped
本文出自 “精彩IT圈” 博客，转载请与作者联系！
原文地址：http://jiagd.blog.51cto.com/3915719/1430807
