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Scenario 1: Extending Disk Space by Attaching a Second Disk to the Analysis Cockpit

This section focuses on extending the disk space by attaching a second disk to the Analysis Cockpit. We will add the second disk to our existing volume group and extend the logical volume.

If you increased the disk size please refer to Scenario 2: Extending ASGARD Disk Space by Increasing Disk Size and Resize File System

Step 1: Login in to ASGARD via SSH

Step 2: Stop service

Bash
nextron@cockpit:~$ sudo systemctl stop asgard-analysis-cockpit.service

This will stop the Analysis Cockpit service. You can start the service again after you have extended the disk space.

Step 3: Check current disk space

Run the following command to check the current disk space. The output will show the current disk space usage:

Bash
nextron@cockpit:~$ df -h
Filesystem                   Size  Used Avail Use% Mounted on
udev                         1.9G     0  1.9G   0% /dev
tmpfs                        392M  524K  392M   1% /run
/dev/mapper/debian--vg-root   24G  3.4G   19G  16% /
tmpfs                        2.0G     0  2.0G   0% /dev/shm
tmpfs                        5.0M     0  5.0M   0% /run/lock
/dev/sda1                    455M   51M  380M  12% /boot
tmpfs                        392M     0  392M   0% /run/user/1000

Step 4: Identify attached disks

Run the following command to identify your attached disks:

Bash
nextron@cockpit:~$ lsblk
NAME                  MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTS
sda                     8:0    0   25G  0 disk
├─sda1                  8:1    0  487M  0 part /boot
├─sda2                  8:2    0    1K  0 part
└─sda5                  8:5    0 24.5G  0 part
  ├─debian--vg-root   254:0    0 23.6G  0 lvm  /
  └─debian--vg-swap_1 254:1    0  980M  0 lvm  [SWAP]
sdb                     8:16   0   20G  0 disk
sr0                    11:0    1 1024M  0 rom

The output will show the attached disks. In this example, the newly attached disk is sdb, whereas the existing disk is sda.

Step 5: Check physical volumes

Run the following command to check all the physical volumes:

Bash
nextron@cockpit:~$ sudo pvs
  PV         VG        Fmt  Attr PSize   PFree
  /dev/sda5  debian-vg lvm2 a--  <24.52g    0

The output will show all the physical volumes. Please note the name of the volume group (VG), in our case debian-vg.

Step 6: Create a new physical volume

Run the following command to create a new physical volume for the new disk:

Bash
nextron@cockpit:~$ sudo pvcreate /dev/sdb
  Physical volume "/dev/sdb" successfully created.

Check physical the volumes again:

Bash
nextron@cockpit:~$ sudo pvs
  PV         VG        Fmt  Attr PSize   PFree
  /dev/sda5  debian-vg lvm2 a--  <24.52g     0
  /dev/sdb             lvm2 ---   20.00g 20.00g

You can see that the new physical volume /dev/sdb has been created. It is not yet part of the volume group (VG).

Step 7: Identify Volume Group

Run the following command to identify your volume groups:

Bash
nextron@cockpit:~$ sudo vgs
  VG        #PV #LV #SN Attr   VSize   VFree
  debian-vg   1   2   0 wz--n- <24.52g    0

The output will show all the volume groups. In this case, the only volume group is debian-vg.

Step 8: Extend Volume Group

Extend the volume group with our new physical volume:

Bash
nextron@cockpit:~$ sudo vgextend debian-vg /dev/sdb
  Volume group "debian-vg" successfully extended

Looking at the volume groups again, you will see that the volume group debian-vg has been extended:

Bash
nextron@cockpit:~$ sudo vgs
  VG        #PV #LV #SN Attr   VSize   VFree
  debian-vg   2   2   0 wz--n- <44.52g <20.00g

The volume group has more space (VSize) and free space (VFree).

Step 9: Extend Logical Volume

We now need to extend the logical volume (using the free space):

Bash
nextron@cockpit:~$ sudo lvextend -l +100%FREE /dev/debian-vg/root
  Size of logical volume debian-vg/root changed from 23.56 GiB (6032 extents) to <43.56 GiB (11151 extents).
  Logical volume debian-vg/root successfully resized.

Explanation: /dev/debian-vg/root is the logical volume that we want to extend. The "-l +100%FREE" option tells the lvextend command to use all the free space available in the volume group. The device /dev/debian-vg is our volume group. The logical volume root is what we extended (output of "sudo lvs").

Step 10: Resize file system

Run the following command to resize the file system:

Bash
nextron@cockpit:~$ sudo resize2fs /dev/debian-vg/root
resize2fs 1.47.0 (5-Feb-2023)
Filesystem at /dev/debian-vg/root is mounted on /; on-line resizing required
old_desc_blocks = 3, new_desc_blocks = 6
The filesystem on /dev/debian-vg/root is now 11418624 (4k) blocks long.

Step 11: Verify disk size changes

Run the following command to verify the change in disk size:

Bash
nextron@cockpit:~$ df -h
Filesystem                   Size  Used Avail Use% Mounted on
udev                         1.9G     0  1.9G   0% /dev
tmpfs                        392M  532K  392M   1% /run
/dev/mapper/debian--vg-root   43G  3.5G   38G   9% /
tmpfs                        2.0G     0  2.0G   0% /dev/shm
tmpfs                        5.0M     0  5.0M   0% /run/lock
/dev/sda1                    455M   51M  380M  12% /boot
tmpfs                        392M     0  392M   0% /run/user/1000

You will notice that /dev/mapper/debian--vg-root has grown.

Step 12: Reboot system

You successfully extended your disk space. Reboot your Analysis Cockpit to make sure everything is working as expected.

Bash
nextron@cockpit:~$ sudo reboot