redhat 6.6 重新调整分区大小
安装系统的时候贪图省事使用了系统的自动分区，系统装好后发现/home分区太大了，500G的硬盘，400多G的空间分给了/home。需将/home的空间划一点出来，分到根分区下去df 查看分区
# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/VolGroup-lv_root
51475068 101490923870453621% /
tmpfs 16442092 22416441868 1% /dev/shm
/dev/sda1 487652 33803 428249 8% /boot
/dev/mapper/VolGroup-lv_home
447558496 71768 424745328 1% /home
1、卸载/home
umount /home
2、调整/home大小为50G
# resize2fs -p /dev/mapper/VolGroup-lv_home 50G
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/mapper/VolGroup-lv_home to 13107200 (4k) blocks.
Begin pass 2 (max = 32768)
Relocating blocks XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Begin pass 3 (max = 3471)
Scanning inode table XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
The filesystem on /dev/mapper/VolGroup-lv_home is now 13107200 blocks long.
3、挂载/home后df查看大小
root@localhost ~]#mount /home
# df -h
Filesystem SizeUsed Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
50G9.7G 37G21% /
tmpfs 16G224K 16G 1% /dev/shm
/dev/sda1 477M 34M419M 8% /boot
/dev/mapper/VolGroup-lv_home
50G 52M 47G 1% /home
4、收缩/home大小为50G，释放其余空间。需按y确认
# lvreduce -L 50G /dev/mapper/VolGroup-lv_home
WARNING: Reducing active and open logical volume to 50.00 GiB
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce lv_home? : y
Size of logical volume VolGroup/lv_home changed from 433.76 GiB (111042 extents) to 50.00 GiB (12800 extents).
Logical volume lv_home successfully resized
5、查剩余空间大小
# vgdisplay
--- Volume group ---
VG Name VolGroup
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No5
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size 499.51 GiB
PE Size 4.00 MiB
Total PE 127874
Alloc PE / Size 29632 / 115.75 GiB
FreePE / Size 98242 / 383.76 GiB
VG UUID 4cl81Y-e6zg-EnAr-xkKb-XkYQ-QGBv-2SJMe3
6、将剩余空间划分到/目录下，即/dev/mapper/VolGroup-lv_root
# lvextend -L +380G /dev/mapper/VolGroup-lv_root
Size of logical volume VolGroup/lv_root changed from 50.00 GiB (12800 extents) to 430.00 GiB (110080 extents).
Logical volume lv_root successfully resized
7、重新设置/分区大小，使扩展的空间生效
# 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 = 27
Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 112721920 (4k) blocks.
The filesystem on /dev/mapper/VolGroup-lv_root is now 112721920 blocks long.
8、查看分区大小确认
# df -h
Filesystem SizeUsed Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
424G9.7G392G 3% /
tmpfs 16G224K 16G 1% /dev/shm
/dev/sda1 477M 34M419M 8% /boot
/dev/mapper/VolGroup-lv_home
50G 52M 47G 1% /home
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