centos 更改磁盘分区大小

# 卸载/home，卸载前记得备份cp -r /home/ homebak/ 我这里/home下没有什么文件，就不备份了
[root@NextCloud ~]# umount /home
[root@NextCloud ~]# df -h
文件系统 容量 已用 可用 已用% 挂载点
/dev/mapper/centos-root 50G 49G 1.6G 97% /
...

# 移除/home所在的lv
[root@NextCloud ~]# lvremove /dev/mapper/centos-home
Do you really want to remove active logical volume centos/home? [y/n]: y
Logical volume "home" successfully removed
​
# 增加/所在的lv，这里我们增加500G空间
[root@NextCloud ~]# lvextend -L +500G /dev/mapper/centos-root
Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to 550.00 GiB (140800 extents).
Logical volume centos/root successfully resized.
​
# 增加lv后查看/并没有增加，确认分区格式
[root@NextCloud ~]# df -hT
文件系统 类型 容量 已用 可用 已用% 挂载点
/dev/mapper/centos-root xfs 50G 49G 1.6G 97% /
...
​
# 扩展/所在文件系统
[root@NextCloud ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=3276800 blks
= sectsz=4096 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=4096 sunit=1 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 13107200 to 144179200
​
# 查看分区大小
[root@NextCloud ~]# df -h
文件系统 容量 已用 可用 已用% 挂载点
/dev/mapper/centos-root 550G 49G 502G 9% /
...
​
# 确认Free PE可分配空间
[root@NextCloud ~]# vgdisplay
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 7
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size <1023.00 GiB
PE Size 4.00 MiB
Total PE 261887
Alloc PE / Size 168416 / <657.88 GiB
Free PE / Size 93471 / 365.12 GiB
VG UUID TDRsyJ-GZ2H-ZRWr-Gfje-LNe1-ggpz-0pJ7jx
​
# 创建home lv分区
[root@NextCloud ~]# lvcreate -L 100G -n home centos
Logical volume "home" created.

注：CentOS8的命令是：
lvcreate -L 100G -n home cl
​
# 格式化home分区
[root@NextCloud ~]# mkfs.xfs /dev/centos/home
meta-data=/dev/centos/home isize=512 agcount=4, agsize=6553600 blks
= sectsz=4096 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=26214400, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=12800, version=2
= sectsz=4096 sunit=1 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
​
# 挂载/home
[root@NextCloud ~]# mount /dev/centos/home /home
​
# 查看分区大小
[root@NextCloud ~]# df -h
文件系统 容量 已用 可用 已用% 挂载点
/dev/mapper/centos-root 550G 49G 502G 9% /
...
/dev/mapper/centos-home 100G 33M 100G 1% /home

转载：

原文链接：https://blog.csdn.net/xtjatswc/article/details/108841519