Volumes

Attach Additional, LVM-backed Volume

This can be useful when more storage is needed temporarily or when certain directories should be excluded from backups.

1. Create logical volume:

   lvcreate -V ${SIZE} --thinpool vm-pool qubes_dom0 --name ${VOLUME_NAME}
   

   Set SIZE size to the virtual size of the disk (e.g. 50GiB).

2. Find device ID:

   $ qvm-block
   BACKEND:DEVID  DESCRIPTION               USED BY
   ${DEVICE_ID}   qubes_dom0-${VOLUME_NAME}
   

3. Attach to Qube:

   qvm-block attach ${QUBE_NAME} ${DEVICE_ID} -o frontend-dev=xvdl
   

   Note

   --persistent cannot be used as ${DEVICE_ID} is not persistent across reboots.

BTRFS subvolumes offer an easy way to move multiple directories onto an additional volume:

1. Format filesystem. See Create FS.

2. Mount filesystem:

   mount /dev/xvdl /mnt
   

3. Create subvolumes for every directory:

   btrfs subvolume create /mnt/@volume1
   btrfs subvolume create /mnt/@volume2
   

4. Move files

5. Umount FS:

   umount /mnt
   

6. Mount individual volumes:

   mount /dev/xvdl ~user/volume1 -t btrfs -o discard=async,noatime,subvol=@volume1
   mount /dev/xvdl /var/lib/volume2 -t btrfs -o discard=async,noatime,subvol=@volume2
   

Resize Additional, LVM-backed Volume

1. (dom0) Resize volume by ${N} GiB:

   lvresize --size +${N}GiB qubes_dom0/${VOLUME_NAME}
   

   Or resize volume to ${N} GiB:

   lvresize --size ${N}GiB qubes_dom0/${VOLUME_NAME}
   

2. (Qube) Resize filesystem:

   btrfs filesystem resize max ${MOUNT_POINT}