centos 系統盤lvm擴容

建立實體卷

新添加擴容磁盤/dev/vdb2

[[email protected] ~]# pvcreate /dev/vdb2
WARNING: ext4 signature detected on /dev/vdb2 at offset 1080. Wipe it? [y/n]: y
  Wiping ext4 signature on /dev/vdb2.
  Physical volume "/dev/vdb2" successfully created
           

擴容vg卷組

• 先檢視卷組名

[[email protected] ~]# vgs
  VG     #PV #LV #SN Attr   VSize   VFree
  centos   3   2   0 wz--n- 339.50g    0 
           

或者

[[email protected] ~]# vgdisplay
  --- Volume group ---
  VG Name               centos
  System ID             
  Format                lvm2
  Metadata Areas        3
  Metadata Sequence No  7
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                3
  Act PV                3
  VG Size               339.50 GiB
  PE Size               4.00 MiB
  Total PE              86912
  Alloc PE / Size       86912 / 339.50 GiB
  Free  PE / Size       0 / 0   
  VG UUID               97wfoc-ySPX-dGIQ-MZMv-6gVQ-aD7A-arVelO
           

• 然後擴容vg

[[email protected] ~]# vgextend centos /dev/vdb2
  Volume group "centos" successfully extended
[[email protected] ~]# vgs
  VG     #PV #LV #SN Attr   VSize   VFree  
  centos   3   2   0 wz--n- 339.50g 300.00g
           

擴容lv

[[email protected] ~]# lvextend -L +300G /dev/centos/root
  Size of logical volume centos/root changed from 38.50 GiB (9856 extents) to 338.50 GiB (86656 extents).
  Logical volume root successfully resized
           

擴充檔案系統

xfs_growfs /dev/centos/root   //xfs_growfs 針對 xfs檔案系統

resize2fs                     //針對ext2/ext3/ext4檔案系統
           

檢視系統盤 已經擴容完畢

40G,擴容了300G

[[email protected] ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root  339G   31G  308G  10% /
devtmpfs                 3.9G     0  3.9G   0% /dev
tmpfs                    3.9G     0  3.9G   0% /dev/shm
tmpfs                    3.9G  375M  3.5G  10% /run
tmpfs                    3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/vda1                497M  155M  343M  32% /boot