1.创建lvm

1.fdisk -l
[root@lb01 ~]# fdisk -l  显示磁盘信息

Disk /dev/sdb: 21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/sda: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000a2c65

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1            2048     4196351     2097152   82  Linux swap / Solaris
/dev/sda2   *     4196352   104857599    50330624   83  Linux



2.[root@lb01 ~]# pvcreate /dev/sdb  将物理磁盘设备初始化为物理卷
  Physical volume "/dev/sdb" successfully created.

3.vgcreate easyits /dev/sdb    创建卷组，将pv加入卷组中

4.lvcreate -n mylv -L 2G easyits  基于卷组创建逻辑卷
-n  指定逻辑卷名称
-L  指定逻辑卷大小
 lvs 显示逻辑卷 
 lvdisplay 显示逻辑卷详细信息
[root@lb01 ~]# lvs 显示逻辑卷  
  LV   VG      Attr       LSize Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  mylv easyits -wi-a----- 2.00g 

5. mkfs.ext4 /dev/easyits/mylv  为创建好的逻辑卷创建文件系统

6.mount /dev/easyits/mylv /mnt  将格式化好的逻辑卷挂载使用

7.[root@lb01 mnt]# df -h  显示挂载信息
Filesystem                Size  Used Avail Use% Mounted on
/dev/sda2                  48G  1.7G   47G   4% /
devtmpfs                  479M     0  479M   0% /dev
tmpfs                     489M     0  489M   0% /dev/shm
tmpfs                     489M  6.8M  482M   2% /run
tmpfs                     489M     0  489M   0% /sys/fs/cgroup
tmpfs                      98M     0   98M   0% /run/user/0
/dev/mapper/easyits-mylv  2.0G  6.0M  1.8G   1% /mnt

2.删除lvm

删除之前先卸载  umount /mnt
一定要按照顺序删除

1.删除lv 逻辑卷   lvremove /dev/easyits/mylv

2.删除vg 卷组   vgremove easyits

3.删除物理卷  pvremove /dev/sdb

3.lvm fs扩容

image.png image.png

4.vg扩容
pvcreate /dev/sdd
vgextend centos /dev/sdd centos卷组名称

项目实例演示

image.png

pvresize -v /dev/sdb
lvextend -L +511g /dev/mapper/VG--data-LV--data
resize2fs -p /dev/mapper/VG--data-LV--data