Centos7将/dev/mapper/centos-home磁盘空间转移到/dev/mapper/centos-root

https://blog.csdn.net/qq_42103279/article/details/108714237
https://www.jianshu.com/p/ed201ae501d8

引用

lvextend命令
-L：指定逻辑卷的大小，单位为“kKmMgGtT”字节； 
-l：指定逻辑卷的大小（LE数）。

[root@localhost ~]# df -h
文件系统                 容量  已用  可用 已用% 挂载点
/dev/mapper/centos-root   50G  1.3G   49G    3% /
devtmpfs                 1.9G     0  1.9G    0% /dev
tmpfs                    1.9G     0  1.9G    0% /dev/shm
tmpfs                    1.9G  9.0M  1.9G    1% /run
tmpfs                    1.9G     0  1.9G    0% /sys/fs/cgroup
/dev/sda1               1014M  148M  867M   15% /boot
/dev/mapper/centos-home   46G   33M   46G    1% /home
tmpfs                    379M     0  379M    0% /run/user/0


[root@localhost ~]# umount /home


[root@localhost ~]# lvremove /dev/mapper/centos-home
Do you really want to remove active logical volume centos/home? [y/n]: y
  Logical volume "home" successfully removed


[root@localhost ~]# lvextend -L +50G /dev/mapper/centos-root
  Insufficient free space: 12800 extents needed, but only 11551 available


[root@localhost ~]# lvextend -l +11551 /dev/mapper/centos-root
  Size of logical volume centos/root changed from 61.28 GiB (15688 extents) to 95.12 GiB (24351 extents).
  Logical volume centos/root successfully resized.


[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