逻辑卷扩容

准备

添加新硬盘
创建 linux lvm（8e） 格式的主分区

LVM

创建逻辑卷的步骤：

1）通过pvcreate命令将linux分区处理成物理卷（PV)；
2）通过vgcreate命令将创建好的物理卷处理成卷组（Vg)；
3）通过lvcreate命令将卷组分成若干个逻辑卷（Lv)；

LVM 扩容

创建pv

pvcreate /dev/vdb1

使用pvs查看

[root@tomcat-tst ~]# pvs
  PV         VG       Fmt  Attr PSize  PFree 
  /dev/vda2  VolGroup lvm2 a--  19.51g     0 
  /dev/vdb1           lvm2 ---  20.00g 20.00g

添加到vg

查看vg

[root@tomcat-tst ~]# vgs
  VG       #PV #LV #SN Attr   VSize  VFree
  VolGroup   1   2   0 wz--n- 19.51g    0 

添加pv到vg

[root@tomcat-tst ~]# vgextend VolGroup /dev/vdb1
  Volume group "VolGroup" successfully extended

[root@tomcat-tst ~]# vgs
  VG       #PV #LV #SN Attr   VSize  VFree 
  VolGroup   2   2   0 wz--n- 39.50g 20.00g

LVM扩容

查看lvm

[root@tomcat-tst ~]# lvs
  LV      VG       Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  lv_root VolGroup -wi-ao---- 17.51g                                                    
  lv_swap VolGroup -wi-ao----  2.00g 

扩容 lvresize

通过 lvresize -L +19G /dev/VolGroup/lv_root 命令扩容LV大小

方法一：添加剩余大小
[root@tomcat-tst ~]# lvresize -L +19G  /dev/VolGroup/lv_root 
  Size of logical volume VolGroup/lv_root changed from 17.51 GiB (4482 extents) to 36.51 GiB (9346 extents).
  Logical volume lv_root successfully resized


方法二：添加剩余pv数
[root@tomcat-tst ~]# lvresize -l +5682  /dev/VolGroup/lv_root 
...

刷新逻辑卷

#xfs_growfs /dev/mapper/centos-root      //刷新文件系统，针对xfs文件格式
#resize2fs /dev/mapper/centos-root       //刷新文件系统，针对ext4文件格式

[root@tomcat-tst ~]# resize2fs  /dev/VolGroup/lv_root 
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/VolGroup/lv_root is mounted on /; on-line resizing required
old desc_blocks = 2, new_desc_blocks = 3
Performing an on-line resize of /dev/VolGroup/lv_root to 9570304 (4k) blocks.
The filesystem on /dev/VolGroup/lv_root is now 9570304 blocks long.

[root@tomcat-tst ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
                       36G  6.3G   28G  19% /
tmpfs                 6.9G     0  6.9G   0% /dev/shm
/dev/vda1             477M   57M  395M  13% /boot
[root@tomcat-tst ~]# lvs
  LV      VG       Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  lv_root VolGroup -wi-ao---- 36.51g                                                    
  lv_swap VolGroup -wi-ao----  2.00g