[Day8] (Super detailed steps) Use LVM to expand capacity

目录

一、LVM逻辑卷的创建

1、Prepare a hard disk

2、Change the type of partition to    8e

3、创建物理卷(PV)

4、创建卷组(VG)

5、创建逻辑卷(LV)

 6、Format and mount logical volumes

二、扩展一个LVM卷

 扩展逻辑卷

 扩展卷组

 根据LVMExpand the root partition

 三、LVM工作原理总结

---

一、LVM逻辑卷的创建

1、Prepare a hard disk

Can be recreated or already created：

The hard disk that has been created and partitioned is used heresdc;

 

2、Change the type of partition to    8e

①然后使用命令：fdisk /dev/sdc　　让硬盘进入分区模式,进行更改类型;

②输入t,Make mode changes

③输入1,Indicates to modify the type of the first partition

④输入8e,Indicates that the type is modified to8e

⑤输入p,查看修改结果

 ⑥All modifications are completed;

 Note that the type of extended partition cannot be modified directly！

 ⑦记得输入w保存,It will prompt that it will take effect on the next restart

3、创建物理卷(PV)

①创建逻辑卷

pvsView physical volume size  pvscan扫描物理卷   pvdisplay 查看详细信息

删除物理卷

pvremove /dev/sdb1

4、创建卷组(VG)

创建卷组：vgcreate volume-group1 /dev/sdb1 /dev/sdb2 /dev/sdb3

删除卷组：vgremove volume-group1

5、创建逻辑卷(LV)

创建一个名为'1v1'、大小为100MB的逻辑卷.我们使用小分区减少执行时间.这个逻辑卷使用之前创建的卷组的空间.（The division is based on physical volume groups,The size cannot exceed the size of the physical volume）

lvcreate -L 100M -n lv1 vg1

 6、Format and mount logical volumes

①格式化逻辑卷

mkfs.xfs /dev/vg1/lv1

 ②创建目录

mkdir /mnt/lv1_mount

 ③挂载逻辑卷

 mount /dev/volume-group1/lv1 /lvm-mount/

 lvremove删除逻辑卷：1.# umount /lvm-mount/

                                      2. # lvremove /dev/volume-group1/lv1

④查看结果

二、扩展一个LVM卷

 扩展逻辑卷

Perform the following operations on the basis of the previous operations

 lvextend -L 200M /dev/vg1/lv1

before expansion：

 expanded：

 扩展卷组

vgextend vg1 /dev/sdc1  （表示将/dev/sdc1扩展到vg1卷组）

before expansion：

expanded：

 根据LVMExpand the root partition

 lvextend -l +100%FREE /dev/mapper/centos-root

【The logical volume that will be created（LV）增加给root】

before expansion：

expanded：

 三、LVM工作原理总结

Follow the partitionsLVMThe format is first created into PV（物理卷）,Add the physical volume to the volume group（VG）里,And then through the roll group out

 LV（逻辑卷）,Finally, the expansion of the partition is realized.