centos 根目录逻辑卷扩容/home -＞ /

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   17  umount /home
   19  lvs
   20  lvremove /dev/mapper/centos-home
   21  lvresize -l +100%FREE /dev/centos/root
   28  xfs_growfs /dev/mapper/centos-root
   29  df -Th

[root@localhost ~]# df -Th
Filesystem              Type      Size  Used Avail Use% Mounted on
/dev/mapper/centos-root xfs        50G 1007M   49G   2% /
devtmpfs                devtmpfs  2.0G     0  2.0G   0% /dev
tmpfs                   tmpfs     2.0G     0  2.0G   0% /dev/shm
tmpfs                   tmpfs     2.0G  8.6M  2.0G   1% /run
tmpfs                   tmpfs     2.0G     0  2.0G   0% /sys/fs/cgroup
/dev/sda1               xfs      1014M  133M  882M  14% /boot
/dev/mapper/centos-home xfs        46G   33M   46G   1% /home
tmpfs                   tmpfs     396M     0  396M   0% /run/user/0
先卸载/home
[root@localhost ~]# umount /home
[root@localhost ~]# vgs
  VG     #PV #LV #SN Attr   VSize   VFree
  centos   1   3   0 wz--n- <99.00g 4.00m
[root@localhost ~]# pvs
  PV         VG     Fmt  Attr PSize   PFree
  /dev/sda2  centos lvm2 a--  <99.00g 4.00m
[root@localhost ~]# lvs
  LV   VG     Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  home centos -wi-a----- <45.12g
  root centos -wi-ao----  50.00g
  swap centos -wi-ao----  <3.88g


[root@localhost ~]# lsblk
NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda               8:0    0  100G  0 disk
├─sda1            8:1    0    1G  0 part /boot
└─sda2            8:2    0   99G  0 part
  ├─centos-root 253:0    0   50G  0 lvm  /
  ├─centos-swap 253:1    0  3.9G  0 lvm  [SWAP]
  └─centos-home 253:2    0 45.1G  0 lvm
sr0              11:0    1  4.3G  0 rom
[root@localhost ~]# lvremove /dev/centos/home
Do you really want to remove active logical volume centos/home? [y/n]: y
  Logical volume "home" successfully removed
[root@localhost ~]# lsblk
NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda               8:0    0  100G  0 disk
├─sda1            8:1    0    1G  0 part /boot
└─sda2            8:2    0   99G  0 part
  ├─centos-root 253:0    0   50G  0 lvm  /
  └─centos-swap 253:1    0  3.9G  0 lvm  [SWAP]
sr0              11:0    1  4.3G  0 rom
[root@localhost ~]#

[root@localhost ~]# lvs
  LV   VG     Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root centos -wi-ao---- 50.00g
  swap centos -wi-ao---- <3.88g



[root@localhost ~]# lvresize -l +100%FREE /dev/mapper/centos-root
  Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to 95.12 GiB (24351 extents).
  Logical volume centos/root successfully resized.
[root@localhost ~]# df -Th
Filesystem              Type      Size  Used Avail Use% Mounted on
/dev/mapper/centos-root xfs        50G 1007M   49G   2% /
devtmpfs                devtmpfs  2.0G     0  2.0G   0% /dev
tmpfs                   tmpfs     2.0G     0  2.0G   0% /dev/shm
tmpfs                   tmpfs     2.0G  8.6M  2.0G   1% /run
tmpfs                   tmpfs     2.0G     0  2.0G   0% /sys/fs/cgroup
/dev/sda1               xfs      1014M  133M  882M  14% /boot
tmpfs                   tmpfs     396M     0  396M   0% /run/user/0
[root@localhost ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=3276800 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=13107200, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=6400, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 13107200 to 24935424
[root@localhost ~]# df -Th
Filesystem              Type      Size  Used Avail Use% Mounted on
/dev/mapper/centos-root xfs        96G 1007M   95G   2% /
devtmpfs                devtmpfs  2.0G     0  2.0G   0% /dev
tmpfs                   tmpfs     2.0G     0  2.0G   0% /dev/shm
tmpfs                   tmpfs     2.0G  8.6M  2.0G   1% /run
tmpfs                   tmpfs     2.0G     0  2.0G   0% /sys/fs/cgroup
/dev/sda1               xfs      1014M  133M  882M  14% /boot
tmpfs                   tmpfs     396M     0  396M   0% /run/user/0
[root@localhost ~]#