You could try attaching an image to the VMs.
First create non-persistent image :
oneimage create -d $IMAGE_DS_ID --name swap --type DATABLOCK --size $SIZE_IN_MB
The newly created image is with IMAGE_ID=37, then attach it to VM with ID $VM_ID
onevm disk-attach $VM_ID --image $IMAGE_ID
This is basic guidelines. You can tweak it further, for example after creating the image attach and format it as swap, etc.
Hope this helps.