centos 系统盘lvm扩容

创建物理卷

新添加扩容磁盘/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
           

扩容vg卷组

• 先查看卷组名

[[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
           

• 然后扩容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
           

扩容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
           

扩充文件系统

xfs_growfs /dev/centos/root   //xfs_growfs 针对 xfs文件系统

resize2fs                     //针对ext2/ext3/ext4文件系统
           

查看系统盘 已经扩容完毕

40G,扩容了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