It is currently not possible to attach additional virtual disks directly via the webinterface.

What you do in principle:

• Update the VMs configuration data in the LDAP directory
• Manually create the virtual disk
• Regenerate the VM configuration on the node

Part I

• In the vm-manager: Expand the VM entry for the VM you want to add an additional disk to and note the UUID below VM name ($VMUUID)
• In a shell: Use uuidgen and generate a new UUID ($DISKUUID)
• Calculate the size of the new disk in bytes: N * 1073741824 for N gigabyte ($DISKSIZE)
• Open the URL http://YOURSTONEYCLOUD/phpldapadmin/ and login using dc=Manager,...
• Navigate to: sstDisk=vda,ou=devices,sstVirtualMachine=$VMUUID,ou=virtual machines,ou=virtualization,ou=services,dc=stoney-cloud,dc=org using the tree structure on the left
• Click on Copy or move this entry and choose sstDisk=vdb,ou=devices,sstVirtualMachine=$VMUUID,ou=virtual machines,ou=virtualization,ou=services,dc=foss-cloud,dc=org as Destination DN
• Replace:
  • the UUID in sstVolumeName
  • and the same UUID in sstSourceFile with $DISKUUID (warning: in sstSourceFile are at least two UUIDs, replace only the one matching sstVolumeName)
  • the value in sstVolumeCapacity by $DISKSIZE
• Click on Create and confirm with Commit
• You should get: Creation successful!
• Note the first UUID in the attribute sstSourceFile ($POOLUUID)

Part II

• Login to the VM node on which the VM is/was running
• Run the following command as root: virsh vol-create-as $POOLUUID $DISKUUID.qcow2 $DISKSIZE --format qcow2 --allocation 0
• You should get: Vol $DISKUUID.qcow2 created
• Run: chown root:vm-storage /var/virtualization/vm-*/$POOLUUID/$DISKUUID.qcow2
• Run: chmod g+rw /var/virtualization/vm-*/$POOLUUID/$DISKUUID.qcow2

Part III

• Open the stoney cloud webinterface (vm-manager)
• Shutdown the VM (if not already done)
• Click first on the edit VM icon and then save (without changing anything)
• Start the VM again