How to configure thin-provisioned raw disks for storage for KVM slave?

Question

How to configure thin-provisioned raw disks for storage for KVM slave?

Answer

Note: the feature is not completely implemented - migration and AutoFTP Backup with raw disks does not work.

1. Connect to a slave server over SSH.
2. Create the directory for disks - commands have to be executed as below:

   # mkdir /vmdata
   # chown solusvm.solusvm /vmdata
   # touch /usr/local/solusvm/data/.disk_image_storage

If adding a slave to a master - volume group is required. To workaround that:

1. Create a file disk.img which will be used as a disk:

   # touch disk.img

2. Set virtual size of the disk:

   # truncate --size=+1T disk.img

   Note: the actual size of the file will be 0, so you can set the size of the disk how you see fit. However the maximum size of a VPS will be limited by the size of the disk (dummy volume group), so it makes sense to set it big.

3. Create a device for it:

   # losetup -Pf --show disk.img
   /dev/loop0

4. Create a physical volume form the device:

   # pvcreate /dev/loop0

5. Create a volume group:

   # vgcreate -s 32M solusvm /dev/loop0

6. Set this volume group in SolusVM > Node > Edit Node of the KVM node.