linux下根目录扩容

划分出一个磁盘，并将其格式化

[[email protected] ~]# mkfs.ext3 /dev/sdb2

创建一个物理卷

[[email protected] ~]# pvcreate /dev/sdb2

[[email protected] ~]# pvs

PV         VG       Fmt  Attr PSize   PFree

/dev/sda2  VolGroup lvm2 a--   19.51g      0

/dev/sdb2           lvm2 ---  153.13g 153.13g

[[email protected] ~]#

[[email protected] ~]#

根路径所在的卷组进行扩容

[[email protected] ~]# vgextend VolGroup /dev/sdb2

Volume group "VolGroup" successfully extended

[[email protected] ~]# vgs

VG       #PV #LV #SN Attr   VSize   VFree

VolGroup   2   2   0 wz--n- 172.64g 153.13g

将根目录的那个逻辑卷进行扩容

[[email protected] ~]# lvextend -L +30G /dev/mapper/VolGroup-lv_root

Size of logical volume VolGroup/lv_root changed from 17.54 GiB (4490 extents) to 47.54 GiB (12170 extents).

Logical volume lv_root successfully resized

[[email protected] ~]# resize2fs -p /dev/mapper/VolGroup-lv_root

resize2fs 1.41.12 (17-May-2010)

Filesystem at /dev/mapper/VolGroup-lv_root is mounted on /; on-line resizing required

old desc_blocks = 2, new_desc_blocks = 3

Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 12462080 (4k) blocks.

The filesystem on /dev/mapper/VolGroup-lv_root is now 12462080 blocks long.

[[email protected] ~]# df -h
Filesystem             Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root                      47G   11G   34G  25% /
tmpfs                  3.9G   72K  3.9G   1% /dev/shm
/dev/sda1               477M   29M  424M   7% /boot

原文地址：https://www.cnblogs.com/wangqianqiannb/p/8446761.html