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Asked: 2020-07-21 05:52:41 +0800 CST

Resizing Ubuntu Server partitions in a Xen environment

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I need to increase an Ubuntu partition, in a Xen environment. Through XenCenter, I increased the disk, from 10GB to 100 GB. Now I can see "xvda" size 100 GB. For reasons I don't know, in xvda, I have: xvda1, xvda2, xvda5 The root (/) is in xvda5, together with a swap. Follows my fdisk command:

Disk /dev/xvda: 100 GiB, 107374182400 bytes, 209715200 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: 0x69465e7c

Device     Boot   Start      End  Sectors  Size Id Type
/dev/xvda1 *       2048   999423   997376  487M 83 Linux
/dev/xvda2      1001470 20969471 19968002  9.5G  5 Extended
/dev/xvda5      1001472 20969471 19968000  9.5G 8e Linux LVM


Disk /dev/xvdd: 1.8 TiB, 1988569858048 bytes, 3883925504 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/xvdb: 1.8 TiB, 1988569858048 bytes, 3883925504 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/ubuntuservermain--vg-root: 8.5 GiB, 9126805504 bytes, 17825792 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/ubuntuservermain--vg-swap_1: 1020 MiB, 1069547520 bytes, 2088960 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

What are the commands I need? I tried solutions taken on the web and stack exchange, without luck. There is a command I found growpart that seems perfect for my needs, but it doesn't seem to work.

As requested, I add the results of another command, lsblk:

NAME                            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sr0                              11:0    1 67.8M  0 rom
xvda                            202:0    0  100G  0 disk
├─xvda1                         202:1    0  487M  0 part /boot
├─xvda2                         202:2    0    1K  0 part
└─xvda5                         202:5    0  9.5G  0 part
  ├─ubuntuservermain--vg-root   252:0    0  8.5G  0 lvm  /
  └─ubuntuservermain--vg-swap_1 252:1    0 1020M  0 lvm  [SWAP]
xvdb                            202:16   0  1.8T  0 disk
xvdd                            202:48   0  1.8T  0 disk
xen ubuntu

1 Answers

  1. I wrote a script that I am using to show the commands to resize volumes.

    In your case you will need to:

    1. Use fdisk and delete extended partition xvda5 and recreate it with the same start sector and leave the default (last sector on current the resized disk).
    2. Then you need to expand the LVM disk label with pvresize.
    3. Then the logical volume with lvresize --resizefs --size +1G (to add 1GB to root volume).

    The script will generated the proper commands for your environment. The resize is possible to be done online, without stopping any application or unmounting any file system.

    Download the script and run it:

    bash vol_resize.sh --block-device /dev/mapper/ubuntuservermain--vg-root

    Add the output to the question and I can explain the generated output.

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