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After creating your instance, you will most likely want to create and attach a storage volume to store all your data on. We also encourage running all your analyses on the storage volume, so that you are not using up your root volume space on your instance.

Create and attach a volume


  1. Log in to the Nimbus dashboard.
  2. Navigate to Volumes > Volumes, then click the + Create Volume button.

    You may see an existing volume already there, with a name like 91bd1e23-ce06-41e0-aeb5-41382df48170. It is most likely the root volume for your instance, and you can ignore it.


  3. On the Create Volume dialog window, enter a volume name and choose a size of your choice in gigabytes, then click the Create Volume button. 
  4. On the Volumes page, click the drop-down arrow next to Edit Volume and select Manage Attachments.

  5. Select the instance you want to attach this volume to.
  6. Click the Attach Volume button.



Format and mount a filesystem


Once you have attached the volume as above, confirm that the volume is properly attached.

You may see the /dev/vda device when working with volumes and filesystems, e.g. with the df command. This is the root volume, mounted at / (known as slash or root), where the operating system and system files are stored. You will not be performing any format or mount commands on this device.

  1. Use ssh to log in to your instance from a terminal.
  2. Check that you have properly attached the volume:

    $ sudo fdisk -l /dev/vdc


    You should see this returned:

    Disk /dev/vdc: 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
  3. (Only new volumes) Format the volume. WARNING: Do this step only for new volumes. Do NOT do this step for existing volumes, as it will wipe out the volume:

    $ sudo mkfs.ext4 /dev/vdc
  4. Mount the volume to a new directory called /data:

    $ sudo mkdir /data
    $ sudo mount /dev/vdc /data
  5. Check your new /data volume:

    $ df -h | grep vdc


  6. Check that you can write files to your new volume:

    cd /data
    touch test.txt

    If you see an error about 'permission denied', you most likely need to change the owner of the volume to ububtu (that's you!) with the following command

    sudo chown ubuntu /data

You have now successfully attached and mounted your storage volume.


Resize a Volume


It is possible to resize an existing storage volume to make it larger, if additional space is required in an instance. This option is dependent on a few things:

  • You need to have sufficient volume storage quota in your project. Go to the "Overview" page on the Nimbus dashboard to see how much volume storage is available.
  • You cannot resize a root volume of an instance (the volume mounted as /dev/vda1 inside the instance). If you require a larger root volume, your only option is to delete the instance and re-create it with a larger root volume on the "Source" section during instance creation.
  • You cannot shrink an existing volume. The new volume size must be larger than the old size.

Provided it meets all these requirements, you can resize a volume by the following steps:

  1. Log on to the instance, and make sure that any file systems on that volume are unmounted (use "umount" if it is mounted):

    $ df -h
  2. Leaving your instance login active, log on to the Nimbus dashboard, go to the "Volumes" page, and select "Manage Attachments" from the drop-down menu to the right of the volume
  3. Click on "Detach Volume", and confirm
  4. Once detached, select "Extend Volume" from the drop-down menu to the right of the volume
  5. Enter the new size in GB (it must be larger than the current size), then click on "Extend Volume"
  6. To re-attach the volume, select "Manage Attachments" from the drop-down menu to the right of the volume
  7. Select the instance you want to attach it to, make a note of the value of the "Device Name" field (usually /dev/vdc), then click on "Attach Volume"
  8. Go back to your active instance login from step 2, and make sure that the operating system can see the attached volume:

    $ sudo fdisk -l /dev/vdc
  9. Run a file system check on the patition first (assuming that the partition is /dev/vdcfdisk will tell you if the partition has a different name like /dev/vdc1):

    $ sudo e2fsck -f /dev/vdc


  10. Resize the partition to use the additional space added to the volume:

    $ sudo resize2fs /dev/vdc


  11. You can now mount the volume again (replace /data with the mount point you normally use for the volume):

    $ sudo mount /dev/vdc /data



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