Posts tagged df

linux: resize vm to full disk size
posted on 2016-06-11 10:38

fter resizing the the virtual harddisk of your virtual machine, several other steps are needed so you can utilize this additional space within the VM. This will only talk about increased sizing, which will usually just work. Unlike with downsizing, which are the same steps just in reverse order, but where you can easily kill your currently still running system. Handle downsizing with very, very much care.

This guide assumes you have a single partition, which is used by LVM, where in you have your filesystem(s) in different logical volumes.

resize the partition

I have a vm with hostname called 'test', which has a single disk (/dev/vda), with a single partition (/dev/vda1), which is used by lvm. LVM volume groups are usually called like the hostname (best approach I know of, so here test), and the logical volumes what they are used for (root, swap), or where they are mounted (i.e. var_lib_vz, not shown here).

root uses ext4 as file system.

Initially the disk size was 50G and was increased to 500G.

After the disk size was increased, you can see the available space on the device:

root@test:~# lsblk
sr0               11:0    1 1024M  0 rom
vda              253:0    0  500G  0 disk
+-vda1           253:1    0   50G  0 part
  +-test-root 252:0    0 14.3G  0 lvm  /
  +-test-swap 252:1    0  976M  0 lvm  [SWAP]

Use a partition manager of your choice (fdisk or cfdisk for disks with an MBR, gdisk or cgdisk for disks using a GPT, or parted if you know what you are doing.), delete your partition. Recreate it with the maximum size, reboot.

Then it should look like this, with adjusted partition size:

root@test:~# lsblk
sr0               11:0    1 1024M  0 rom
vda              253:0    0  500G  0 disk
+-vda1           253:1    0  500G  0 part
  +-test-root 252:0    0   49G  0 lvm  /
  +-test-swap 252:1    0  976M  0 lvm  [SWAP]

resize PV, LV, file system

First make LVM format the addition free space: (It will 'partition' it so it can work with it, effectively splitting it into junks of like 4MB if I recall correctly.)

root@test:~# pvresize /dev/vda1
  Physical volume "/dev/vda1" changed
  1 physical volume(s) resized / 0 physical volume(s) not resized

Since the PV was already a member of the VG, no need to extend the VG.

Now for the actual volume:

root@test:~# lvextend -L 499G /dev/test/root
  Size of logical volume test/root changed from 49.04 GiB (12555 extents) to 499.00 GiB (127744 extents).
  Logical volume root successfully resized.

Here I specified it to be resized to 499GB. If I wanted to just use all available space, I'd do:

lvextend -l +100%FREE /dev/mapper/test-root

root@test:~# lvextend -l +100%FREE /dev/mapper/test-root
  Size of logical volume test/root changed from 450.00 GiB (115200 extents) to 499.04 GiB (127755 extents).
  Logical volume root successfully resized.

The -L is just easier to remember.

Lastly, resize the used filesystem:

root@test:~# resize2fs -p /dev/mapper/test-root
resize2fs 1.42.13 (17-May-2015)
Dateisystem bei /dev/mapper/test-root ist auf / eingeh�ngt; Online-Gr��en�nderung ist
old_desc_blocks = 1, new_desc_blocks = 32
Das Dateisystem auf /dev/mapper/test-root is nun 130821120 (4k) Bl�cke lang.

Verify it:

root@test:~# df -h
Dateisystem              Groesse Benutzt Verf. Verw% Eingehaengt auf
udev                      983M       0  983M    0% /dev
tmpfs                     201M    3.2M  197M    2% /run
/dev/mapper/test-root  492G    2.3G  469G    1% /
tmpfs                    1001M       0 1001M    0% /dev/shm
tmpfs                     5.0M       0  5.0M    0% /run/lock
tmpfs                    1001M       0 1001M    0% /sys/fs/cgroup

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