一、创建物理卷(pv)
[root@localhost ~]# pvcreate /dev/sdc3
Physical volume "/dev/sdc3" successfully created.
二、创建卷组(vg)
[root@localhost ~]# vgcreate vg3 /dev/sdc3
Volume group "vg3" successfully created
三、创建逻辑卷(lv)
[root@localhost ~]# lvcreate -L 300M -n lv3 vg3
Logical volume "lv3" created.
四、格式化(指定文件系统)
[root@localhost ~]# mkfs.ext4 /dev/vg3/lv3
mke2fs 1.42.9 (28-Dec-2013)
文件系统标签=
OS type: Linux
...
Writing superblocks and filesystem accounting information: 完成
五、挂载
[root@localhost ~]# mkdir /mnt/fdiskc3
[root@localhost ~]# mount -t ext4 /dev/vg3/lv3 /mnt/fdiskc3
[root@localhost ~]# df -hT
文件系统 类型 容量 已用 可用 已用% 挂载点
/dev/mapper/centos-root xfs 17G 4.7G 13G 28% /
...
/dev/sr0 iso9660 4.3G 4.3G 0 100% /run/media/root/CentOS 7 x86_64
/dev/sdc2 ext4 2.0G 6.0M 1.8G 1% /mnt/fdiskc2
/dev/mapper/vg3-lv3 ext4 283M 2.1M 262M 1% /mnt/fdiskc3
六、pv、vg、lv查看
pvs、pvscan、pvdisplay(vg、lv一样)
七、LV缩容(先卸载才能保证数据安全)
[root@localhost ~]# umount /dev/vg3/lv3
[root@localhost ~]# e2fsck -f /dev/vg3/lv3(检查文件系统是否正常)
e2fsck 1.42.9 (28-Dec-2013)
第一步: 检查inode,块,和大小
第二步: 检查目录结构
第3步: 检查目录连接性
Pass 4: Checking reference counts
第5步: 检查簇概要信息
/dev/vg3/lv3: 11/127512 files (0.0% non-contiguous), 26612/512000 blocks
[root@localhost ~]# lvreduce -L 400M /dev/vg3/lv3
WARNING: Reducing active logical volume to 400.00 MiB.
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce vg3/lv3? [y/n]: y
Size of logical volume vg3/lv3 changed from 500.00 MiB (125 extents) to 400.00 MiB (100 extents).
Logical volume vg3/lv3 successfully resized
[root@localhost ~]# mkfs.ext4 /dev/vg3/lv3(缩小后再次指定文件系统)
mke2fs 1.42.9 (28-Dec-2013)
...
Writing superblocks and filesystem accounting information: 完成
[root@localhost ~]# mount -t ext4 /dev/vg3/lv3 /mnt/fdiskc3(缩容后挂载)
八、移除逻辑卷(先卸载,从高往下移除)
[root@localhost ~]# umount /dev/vg3/lv3 //卸载lv
[root@localhost ~]# lvremove /dev/vg3/lv3 //移除lv逻辑卷
Do you really want to remove active logical volume vg3/lv3? [y/n]: y
Logical volume "lv3" successfully removed
[root@localhost ~]# vgremove vg3 //移除卷组
Volume group "vg3" successfully removed
[root@localhost ~]# pvremove /dev/sdc3 //移除物理卷
Labels on physical volume "/dev/sdc3" successfully wiped.
九、扩容
resize2fs /dev/zq/mylv #更新文件系统,操作系统重新扫描,这个时候才可以使用刚才增加的空间