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Proxmox - Increase VM Disk Size
Proxmox - Increase VM Disk Size
Posted Oct 1, 2016
By harryvasanth
9 min read
Steps
These are the steps to increase the disk size of the VMs in Proxmox


Add new disk in Proxmox VE UI
Add new, or increase size of existing, disk in Proxmox VE UI
Partition the new disk
Partition the new disk
Create a new physical device (using pvcreate)
Create a new physical device (using pvcreate)

Latest revision as of 22:29, 15 April 2024

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Credit 

Proxmox - Increase VM Disk Size

Add new, or increase size of existing, disk in Proxmox VE UI
Partition the new disk
Create a new physical device (using pvcreate)
Extend the existing volume group
Extend the logical volume
Extend the file system (ext4 in my case)
Check current storage
First lets check how much space left on the VM:

root@jupyterhub:~# df -h
Filesystem                       Size  Used Avail Use% Mounted on
udev                             2.0G     0  2.0G   0% /dev
tmpfs                            396M   11M  385M   3% /run
/dev/mapper/ubuntu1604--vg-root   18G   15G  1.8G  90% /
tmpfs                            2.0G  4.0K  2.0G   1% /dev/shm
tmpfs                            5.0M     0  5.0M   0% /run/lock
tmpfs                            2.0G     0  2.0G   0% /sys/fs/cgroup
/dev/mapper/ubuntu1604--vg-home   20G   44M   19G   1% /home/jupyter
/dev/mapper/ubuntu1604--vg-log   465M  112M  325M  26% /var/log
/dev/sda1                        472M  155M  293M  35% /boot
tmpfs                            396M     0  396M   0% /run/user/2160
Now lets see all the available disks on the system after adding a new disk through Promox VE User Interface:

root@testvm:~# fdisk -l
Disk /dev/sda: 10 GiB, 10737418240 bytes, 20971520 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x93152316

Device     Boot   Start      End  Sectors  Size Id Type
/dev/sda1  *       2048   999423   997376  487M 83 Linux
/dev/sda2       1001470 20969471 19968002  9.5G  5 Extended
/dev/sda5       1001472 20969471 19968000  9.5G 8e Linux LVM


Disk /dev/sdb: 64 GiB, 68719476736 bytes, 134217728 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/sdc: 32 GiB, 34359738368 bytes, 67108864 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 6B4A0899-D3D5-4771-856D-EDB254829C91

Device     Start      End  Sectors Size Type
/dev/sdc1   2048 67108830 67106783  32G Linux filesystem


Disk /dev/mapper/ubuntu1604--vg-root: 17.5 GiB, 18815647744 bytes, 36749312 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/ubuntu1604--vg-swap: 952 MiB, 998244352 bytes, 1949696 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/ubuntu1604--vg-log: 488 MiB, 511705088 bytes, 999424 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/ubuntu1604--vg-home: 20 GiB, 21474836480 bytes, 41943040 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Partitioning the new disk
As you can see the 64 GiB disk is present without any partitioning. Lets go ahead and partition that disk:

root@testvm:~# fdisk /dev/sdb

Welcome to fdisk (util-linux 2.27.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Device does not contain a recognized partition table.
Created a new DOS disklabel with disk identifier 0x193c65a1.

Command (m for help): n
Partition type
   p   primary (0 primary, 0 extended, 4 free)
   e   extended (container for logical partitions)
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-134217727, default 2048):
Last sector, +sectors or +size{K,M,G,T,P} (2048-134217727, default 134217727):

Created a new partition 1 of type 'Linux' and of size 64 GiB.

Command (m for help): p
Disk /dev/sdb: 64 GiB, 68719476736 bytes, 134217728 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x193c65a1

Device     Boot Start       End   Sectors Size Id Type
/dev/sdb1        2048 134217727 134215680  64G 83 Linux

Command (m for help): p
Disk /dev/sdb: 64 GiB, 68719476736 bytes, 134217728 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x193c65a1

Device     Boot Start       End   Sectors Size Id Type
/dev/sdb1        2048 134217727 134215680  64G 83 Linux

Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.
Now let’s create a new physical device with the newly partitioned disk using pvcreate and view it using pvdisplay:

root@testvm:~# pvcreate /dev/sdb1
  Physical volume "/dev/sdb1" successfully created

root@jupyterhub:~# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda5
  VG Name               ubuntu1604-vg
  PV Size               9.52 GiB / not usable 2.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              2437
  Free PE               0
  Allocated PE          2437
  PV UUID               qNCelA-nJDf-NX7Q-ZkK4-iR4M-vQho-mfFqA1

  --- Physical volume ---
  PV Name               /dev/sdc1
  VG Name               ubuntu1604-vg
  PV Size               32.00 GiB / not usable 2.98 MiB
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              8191
  Free PE               662
  Allocated PE          7529
  PV UUID               fu3bxw-oCCH-jOh1-428b-lAQf-DCBe-E6KQiv

  "/dev/sdb1" is a new physical volume of "64.00 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/sdb1
  VG Name
  PV Size               64.00 GiB
  Allocatable           NO
  PE Size               0
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               F0FsRP-ROTm-xbMv-7I3D-E0Jh-mfBw-rM4mn4
Check current volume group
Thereafter, let’s go ahead and check the current volume groups using vgdisplay:

root@testvm:~# vgdisplay
  --- Volume group ---
  VG Name               ubuntu1604-vg
  System ID
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  12
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                4
  Open LV               4
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               41.52 GiB
  PE Size               4.00 MiB
  Total PE              10628
  Alloc PE / Size       9966 / 38.93 GiB
  Free  PE / Size       662 / 2.59 GiB
  VG UUID               BR84gF-JBKN-ndcp-At3G-l9UB-4CAs-KVyyta
Extend current volume group
Now we can extend it using vgextend and verify it using vgdisplay:

root@testvm:~# vgextend ubuntu1604-vg /dev/sdb1
  Volume group "ubuntu1604-vg" successfully extended

root@testvm:~# vgdisplay
  --- Volume group ---
  VG Name               ubuntu1604-vg
  System ID
  Format                lvm2
  Metadata Areas        3
  Metadata Sequence No  13
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                4
  Open LV               4
  Max PV                0
  Cur PV                3
  Act PV                3
  VG Size               105.51 GiB
  PE Size               4.00 MiB
  Total PE              27011
  Alloc PE / Size       9966 / 38.93 GiB
  Free  PE / Size       17045 / 66.58 GiB
  VG UUID               BR84gF-JBKN-ndcp-At3G-l9UB-4CAs-KVyyta
Thereafter, lets go ahead and check the logical volumes using lvdisplay:

root@testvm:~# lvdisplay
  --- Logical volume ---
  LV Path                /dev/ubuntu1604-vg/swap
  LV Name                swap
  VG Name                ubuntu1604-vg
  LV UUID                0SYO9N-bAdU-vfGR-soF1-vvcp-Bg8v-EPrJEL
  LV Write Access        read/write
  LV Creation host, time ubuntu1604, 2017-06-27 15:12:58 +0100
  LV Status              available
  # open                 2
  LV Size                952.00 MiB
  Current LE             238
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:1

  --- Logical volume ---
  LV Path                /dev/ubuntu1604-vg/log
  LV Name                log
  VG Name                ubuntu1604-vg
  LV UUID                fXp0kR-TYBp-mdiS-sYXd-ja2S-dABf-ThjEf0
  LV Write Access        read/write
  LV Creation host, time ubuntu1604, 2017-06-27 15:13:14 +0100
  LV Status              available
  # open                 1
  LV Size                488.00 MiB
  Current LE             122
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:2

  --- Logical volume ---
  LV Path                /dev/ubuntu1604-vg/root
  LV Name                root
  VG Name                ubuntu1604-vg
  LV UUID                WwteZj-vPhz-3iNC-26Dg-Ju36-o6xe-75WRto
  LV Write Access        read/write
  LV Creation host, time ubuntu1604, 2017-06-27 15:13:50 +0100
  LV Status              available
  # open                 1
  LV Size                17.52 GiB
  Current LE             4486
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:0

  --- Logical volume ---
  LV Path                /dev/ubuntu1604-vg/home
  LV Name                home
  VG Name                ubuntu1604-vg
  LV UUID                OQHBcC-aEeD-ePLq-ezMU-3OgV-JPyn-2yarKe
  LV Write Access        read/write
  LV Creation host, time ubuntu1604, 2017-09-27 12:16:53 +0100
  LV Status              available
  # open                 1
  LV Size                20.00 GiB
  Current LE             5120
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:3
Extend the root volume
Lets extend the root volume by 10 GiB using lvextend:

root@testvm:~# lvextend --resizefs -L+10G /dev/ubuntu1604-vg/root
  Size of logical volume ubuntu1604-vg/root changed from 22.52 GiB (5766 extents) to 32.52 GiB (8326 extents).
  Logical volume root successfully resized.
resize2fs 1.42.13 (17-May-2015)
Filesystem at /dev/mapper/ubuntu1604--vg-root is mounted on /; on-line resizing required
old_desc_blocks = 2, new_desc_blocks = 3
The filesystem on /dev/mapper/ubuntu1604--vg-root is now 8525824 (4k) blocks long.
Allocate entire disk space to the volume
In case we want the entire disk space to extended you can simply assign 100% of the free space.

root@testvm:~# lvextend --resizefs -l +100%FREE /dev/ubuntu1604-vg/root
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