I have one setup where /
has 50G
space. I want to increase space for /
.
[root@testsyst ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_testsyst-lv_root 50G 22G 26G 46% /
tmpfs 127G 0 127G 0% /dev/shm
/dev/mapper/mpathap1 481M 40M 416M 9% /boot
/dev/mapper/vg_testsyst-lv_home 242G 188M 230G 1% /home
/home
has 242G
, from /home
I want to move 150G
to /
.
See the output of lvmdisplay
and vgdisplay
below.
[root@testsyst ~]# lvdisplay
--- Logical volume ---
LV Path /dev/vg_testsyst/lv_root
LV Name lv_root
VG Name vg_testsyst
LV UUID VzQzcz-NssK-8BIT-qtjz-XJho-0Mwd-fEbph1
LV Write Access read/write
LV Creation host, time testsyst, 2014-05-01 23:51:39 +0530
LV Status available
# open 1
LV Size 50.00 GiB
Current LE 12800
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:3
--- Logical volume ---
LV Path /dev/vg_testsyst/lv_home
LV Name lv_home
VG Name vg_testsyst
LV UUID zNUKiG-QouE-q71z-ohNQ-0cFR-lggG-jNksZd
LV Write Access read/write
LV Creation host, time testsyst, 2014-05-01 23:51:41 +0530
LV Status available
# open 1
LV Size 245.50 GiB
Current LE 62847
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:5
--- Logical volume ---
LV Path /dev/vg_testsyst/lv_swap
LV Name lv_swap
VG Name vg_testsyst
LV UUID Nv191J-qMuf-zX7R-ifLV-76Et-V1Yp-LAkejt
LV Write Access read/write
LV Creation host, time testsyst, 2014-05-01 23:51:48 +0530
LV Status available
# open 1
LV Size 4.00 GiB
Current LE 1024
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:4
[root@testsyst ~]# vgdisplay
--- Volume group ---
VG Name vg_testsyst
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 4
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 299.50 GiB
PE Size 4.00 MiB
Total PE 76671
Alloc PE / Size 76671 / 299.50 GiB
Free PE / Size 0 / 0
VG UUID eHqLTK-G941-Xy9V-Ga8X-0AZH-Ndf4-g5wtag
Best Answer
Boot with a maintenance CD that supports LVM, for example SystemRescueCD.
Open a root shell.
Reduce the size of /home:
The
--resizefs
option is essential, to reduce the size of the file system before you reduce the size of the volume that holds it. I believe that that option should work for most common file systems, but if it doesn't, you'll have to reduce the size of the file system first, using e.g. resize2fs for ext2/3/4 file systems.The 150 GB have now been returned to the vg_testsyst volume group.
Add the extra space to /:
This time
--resizefs
will expand the size of the file system to equal the new volume size.Reboot.