Here's a way to resize the root filesystem.
Note that while the size increase can be done online, as of RedHat 5, size reduction must be performed in rescue mode.
Here's a tipical installation:
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
7.7G 3.1G 4.3G 42% /
/dev/sda1 99M 19M 75M 21% /boot
tmpfs 502M 0 502M 0% /dev/shm
# vgdisplay -v
Finding all volume groups
Finding volume group "VolGroup00"
--- Volume group ---
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 9.88 GB
PE Size 32.00 MB
Total PE 316
Alloc PE / Size 316 / 9.88 GB
Free PE / Size 0 / 0
VG UUID CJqD4r-kRQM-Cj9e-XwOr-6dn8-TkPH-MfTTyZ
--- Logical volume ---
LV Name /dev/VolGroup00/LogVol00
VG Name VolGroup00
LV UUID d4iToX-8m0c-jf9s-sMMN-VDpO-brE8-4kWhf2
LV Write Access read/write
LV Status available
# open 1
LV Size 7.91 GB
Current LE 253
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
--- Logical volume ---
LV Name /dev/VolGroup00/LogVol01
VG Name VolGroup00
LV UUID kEzo7d-AHuv-xiPD-3Qbo-v8yY-6w1D-DFMIwN
LV Write Access read/write
LV Status available
# open 1
LV Size 1.97 GB
Current LE 63
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
--- Physical volumes ---
PV Name /dev/sda2
PV UUID 7bPvQd-H8yE-v00N-asPT-WQ92-6oCS-bBh6nj
PV Status allocatable
Total PE / Free PE 316 / 0
The physical volume is full, with 0 free extents.
We are going to reduce / size to 6GB.
Boot in rescue mode
boot: linux rescue
Skip existing installation detection.
Activate existing volume groups:
# lvm vgscan
# lvm vgchange -ay /dev/VolGroup00
Run a filesystem check before resizing:
# e2fsck -f /dev/VolGroup00/LogVol00
Set the filesystem size a litte less than required, so the resizing of the underlying logical volume won't cut short the filesystem itself.
# resize2fs /dev/VolGroup00/LogVol00 5G
Resize the logical volume to the target size.
# lvm lvresize -L 6G /dev/VolGroup00/LogVol00
Now resize again the filesystem without giving any size, so it will fill up the logical volume.
# resize2fs /dev/VolGroup00/LogVol00
Reboot back into the system.
You can see the new / size:
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
5.9G 3.1G 2.7G 54% /
/dev/sda1 99M 19M 75M 21% /boot
tmpfs 502M 0 502M 0% /dev/shm
# vgdisplay -v
Finding all volume groups
Finding volume group "VolGroup00"
--- Volume group ---
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 9.88 GB
PE Size 32.00 MB
Total PE 316
Alloc PE / Size 255 / 7.97 GB
Free PE / Size 61 / 1.91 GB
VG UUID CJqD4r-kRQM-Cj9e-XwOr-6dn8-TkPH-MfTTyZ
--- Logical volume ---
LV Name /dev/VolGroup00/LogVol00
VG Name VolGroup00
LV UUID d4iToX-8m0c-jf9s-sMMN-VDpO-brE8-4kWhf2
LV Write Access read/write
LV Status available
# open 1
LV Size 6.00 GB
Current LE 192
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
--- Logical volume ---
LV Name /dev/VolGroup00/LogVol01
VG Name VolGroup00
LV UUID kEzo7d-AHuv-xiPD-3Qbo-v8yY-6w1D-DFMIwN
LV Write Access read/write
LV Status available
# open 1
LV Size 1.97 GB
Current LE 63
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
--- Physical volumes ---
PV Name /dev/sda2
PV UUID 7bPvQd-H8yE-v00N-asPT-WQ92-6oCS-bBh6nj
PV Status allocatable
Total PE / Free PE 316 / 61
And the physical volume now has some spare space left.
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