Vat of Knowledge

This is a reprint of a PDF I found online regarding resizing LVM volumes with ESX server for Linux distros. Credit belongs to the author, David Maphis who wrote this article on 4/29/2008:

In this example I will changed the size of my root partition without
affecting any data. Since this is a VM, I can extend my vmdk with the
“vmkfstools” command. To do this I will have to shutdown the VM to release the lock on the file then resize it. Power up when complete.
Once this is done, make a partition that uses the available space you wish to add to the LVM volume using “parted”. It has an interactive shell, so just enter “parted” in a shell:

parted
(parted) print
Model: VMware Virtual disk (scsi)
Disk /dev/sda: 10.7GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
1 32.3kB 206MB 206MB primary ext3 boot
2 206MB 8587MB 8382MB primary lvm

So I have from 8588MB to 10.7GB available for a new partition. For this
example I’m only using up to 9588MB. Your numbers will obviously vary.
So now let’s make a partition from the new space:

(parted) mkpart primary 8588 9588
(parted) print
Model: VMware Virtual disk (scsi)
Disk /dev/sda: 10.7GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
1 32.3kB 206MB 206MB primary ext3 boot
2 206MB 8587MB 8382MB primary lvm
3 8587MB 9588MB 1001MB primary

You can now see that we have allocated a total of 1001MB of space to
partition 3 or /dev/sda3. Next we need to create a Physical Volume (PV) with “pvcreate”. LVM also has an interactive shell, so type “lvm” in a shell prompt:

lvm
lvm> pvcreate /dev/sda3
Physical volume “/dev/sda3″ successfully created
lvm> pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 VolGroup00 lvm2 a- 7.78G 32.00M
/dev/sda3 lvm2 — 954.44M 954.44M

Now there is a partition that is about 1GB of space available on PV
/dev/sda3. Now we need to extend the Volume Group (VG) to include the new PV with the “vgextend” command:

lvm> vgextend VolGroup00 /dev/sda3
Volume group “VolGroup00″ successfully extended
lvm> pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 VolGroup00 lvm2 a- 7.78G 32.00M
/dev/sda3 VolGroup00 lvm2 a- 928.00M 928.00M

By virtue of the fact that we used the same name as the existing VG, we have now included this PV in the VG. Extend the Logical Volume (LV) to include the new space with “lvextend”. To determine that size of the extents we want to add, we first need to view the VG:

lvm> vgdisplay VolGroup00
— Volume group —
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 2
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 2
Act PV 2
VG Size 8.69 GB
PE Size 32.00 MB
Total PE 278
Alloc PE / Size 248 / 7.75 GB
Free PE / Size 30 / 960.00 MB
VG UUID Ll4Bg4-jIFV-lfut-z4Ae-JTfH-0Hzp-Zf9RjM

Looking at this we can see that the total “Free PE” is 30. We will use this in the following command:

lvm> lvextend -l+30 /dev/VolGroup00/LogVol00
Extending logical volume LogVol00 to 8.19 GB
Logical volume LogVol00 successfully resized
lvm> lvs
LV VG Attr LSize Origin Snap% Move Log Copy%
LogVol00 VolGroup00 -wi-ao 8.19G
LogVol01 VolGroup00 -wi-ao 512.00M

So there you are, you have now extended your LV. Now we have to clue the OS in what is happening. We need to expand the file system to make the new space visible to the OS with resize2fs (Fedora, CentOS) or ext2online (RedHat)

[root@labserver02 dev]# df -h /
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
7.1G 1.3G 5.4G 20% /
[root@labserver02 dev]# resize2fs
resize2fs 1.40.2 (12-Jul-2007)
Usage: resize2fs [-d debug_flags] [-f] [-F] [-p] device [new_size]
[root@labserver02 dev]# resize2fs /dev/VolGroup00/LogVol00
resize2fs 1.40.2 (12-Jul-2007)
Filesystem at /dev/VolGroup00/LogVol00 is mounted on /; on-line resizing
required
old desc_blocks = 1, new_desc_blocks = 1
Performing an on-line resize of /dev/VolGroup00/LogVol00 to 2146304 (4k)
blocks.
The filesystem on /dev/VolGroup00/LogVol00 is now 2146304 blocks long.
[root@labserver02 dev]# df -h /
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
8.0G 1.3G 6.3G 17% /