我有一个1 280GB磁盘的虚拟机。 出于某种原因，我的布局是：
$ df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 50G 21G 30G 41% / devtmpfs 5.8G 0 5.8G 0% /dev tmpfs 5.8G 0 5.8G 0% /dev/shm tmpfs 5.8G 8.5M 5.8G 1% /run tmpfs 5.8G 0 5.8G 0% /sys/fs/cgroup /dev/mapper/centos-home 224G 13G 212G 6% /home /dev/sda1 497M 145M 352M 30% /boot tmpfs 1.2G 0 1.2G 0% /run/user/1000 运行fdisk -l：
$ sudo fdisk -l [sudo] password for admin: Disk /dev/sda: 300.6 GB, 300647710720 bytes, 587202560 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0x0006c283 Device Boot Start End Blocks Id System /dev/sda1 * 2048 1026047 512000 83 Linux /dev/sda2 1026048 587202559 293088256 8e Linux LVM Disk /dev/mapper/centos-swap: 6316 MB, 6316621824 bytes, 12337152 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/mapper/centos-root: 53.7 GB, 53687091200 bytes, 104857600 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/mapper/centos-home: 240.1 GB, 240115515392 bytes, 468975616 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes
和：
$ sudo lsblk -io NAME,TYPE,SIZE,MOUNTPOINT,FSTYPE,MODEL NAME TYPE SIZE MOUNTPOINT FSTYPE MODEL fd0 disk 4K sda disk 280G Virtual disk |-sda1 part 500M /boot xfs `-sda2 part 279.5G LVM2_member |-centos-swap lvm 5.9G [SWAP] swap |-centos-root lvm 50G / xfs `-centos-home lvm 223.6G /home xfs sr0 rom 1024M VMware IDE CDR10
如何将用于/ dev / mapper / centos-home的磁盘空间移动到/ dev / mapper / centos-root？ 我必须缩小centos-home并重新分配到centos-root吗？
只要未安装，您就可以减less您的家用LV。 （请记住，萎缩有一定的风险）
走这样的：
umount /dev/mapper/centos-home lvreduce -L 200G /dev/mapper/centos-home
装好你的家庭分区，你完成了。
然后只是扩大你的根音量。
lvextend -t -r -l+100%FREE /dev/mapper/centos-root
-t是testing，如果没关系，只需再次运行该命令而不用-t
我使用命令sudo umount -fl /home强制unmount
然后进行这些指示。