author：headsen chen
date： 2018-04-20 16:48:06
1、查看分区：/home 为67G,太大了，/ 是50g,太小了。 [root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 50G 1.5G 46G 4% / tmpfs 495M 0 495M 0% /dev/shm /dev/sda1 477M 36M 416M 8% /boot /dev/mapper/VolGroup-lv_home 67G 52M 63G 1% /home
2，先卸载/home 分区
[root@localhost ~]# umount /home
[root@localhost ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 50G 1.5G 46G 4% / tmpfs 495M 0 495M 0% /dev/shm /dev/sda1 477M 36M 416M 8% /boot
3，减少lv_home的逻辑卷大小调整为10G
[root@localhost ~]# e2fsck -f /dev/mapper/VolGroup-lv_home
e2fsck 1.41.12 (17-May-2010) Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information /dev/mapper/VolGroup-lv_home: 11/4431872 files (0.0% non-contiguous), 324173/17713152 blocks
[root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 10G
resize2fs 1.41.12 (17-May-2010) Resizing the filesystem on /dev/mapper/VolGroup-lv_home to 2621440 (4k) blocks. Begin pass 2 (max = 32768) Relocating blocks XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Begin pass 3 (max = 541) Scanning inode table XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX The filesystem on /dev/mapper/VolGroup-lv_home is now 2621440 blocks long.
4，重新挂载/home分区
[root@localhost ~]# mount /home [root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 50G 1.5G 46G 4% / tmpfs 495M 0 495M 0% /dev/shm /dev/sda1 477M 36M 416M 8% /boot /dev/mapper/VolGroup-lv_home 9.8G 36M 9.2G 1% /home
[root@localhost ~]# ls /home lost+found [root@localhost ~]# vgs
VG #PV #LV #SN Attr VSize VFree VolGroup 1 3 0 wz--n- 119.51g 0 [root@localhost ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lv_home VolGroup -wi-ao---- 67.57g lv_root VolGroup -wi-ao---- 50.00g lv_swap VolGroup -wi-ao---- 1.94g
5，在逻辑卷里面减少lv的大小
[root@localhost ~]# lvreduce -L -51G /dev/VolGroup/lv_home
WARNING: Reducing active and open logical volume to 16.57 GiB THIS MAY DESTROY YOUR DATA (filesystem etc.) Do you really want to reduce lv_home? [y/n]: y Size of logical volume VolGroup/lv_home changed from 67.57 GiB (17298 extents) to 16.57 GiB (4242 extents). Logical volume lv_home successfully resized
[root@localhost ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lv_home VolGroup -wi-ao---- 16.57g lv_root VolGroup -wi-ao---- 50.00g lv_swap VolGroup -wi-ao---- 1.94g
[root@localhost ~]# vgs VG #PV #LV #SN Attr VSize VFree VolGroup 1 3 0 wz--n- 119.51g 51.00g
6，增加lv_root的lv
[root@localhost ~]# lvextend -L +50G /dev/VolGroup/lv_root Size of logical volume VolGroup/lv_root changed from 50.00 GiB (12800 extents) to 100.00 GiB (25600 extents). Logical volume lv_root successfully resized
7,使文件系统重新扫描lv,使修改立即生效。
[root@localhost ~]# 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 = 4, new_desc_blocks = 7 Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 26214400 (4k) blocks. The filesystem on /dev/mapper/VolGroup-lv_root is now 26214400 blocks long.
[root@localhost ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 99G 1.5G 92G 2% / tmpfs 495M 0 495M 0% /dev/shm /dev/sda1 477M 36M 416M 8% /boot /dev/mapper/VolGroup-lv_home 9.8G 36M 9.2G 1% /home [root@localhost ~]#