Change the volume version to v3 for cinder v3

main.tf

@@ -55,7 +55,7 @@ output "keypair_name" {
 }
 
 data "openstack_networking_network_v2" "external_net" {name = var.external_network}
-data "openstack_blockstorage_volume_v2" "disk" {name = var.data_volume}
+data "openstack_blockstorage_volume_v3" "disk" {name = var.data_volume}
 
 # runs the ohpc-instance module - creates ohpc instance using variables defined above
 # calls functions from dmz-network, import-keypair, and floating-ip-address modules to get values created there for use