diff --git a/terraform/azure.tf b/terraform/azure.tf
index 3c086d4..1707592 100644
--- a/terraform/azure.tf
+++ b/terraform/azure.tf
@@ -1,271 +1,271 @@
 ##############################
 # Global
 
 provider "azurerm" {
 }
 
 data "azurerm_network_security_group" "worker-nsg" {
   name                = "worker-nsg"
   resource_group_name = "swh-resource"
 }
 
 data "azurerm_subnet" "default" {
   name                 = "default"
   virtual_network_name = "swh-vnet"
   resource_group_name  = "swh-resource"
 }
 
 ##############################
 # Cassandra servers
 
 resource "azurerm_network_interface" "cassandra-servers_interfaces" {
   count = "${var.nb_cassandra_servers}"
 
   name                = "cassandra-server-${count.index}_interface"
   location            = "westeurope"
   resource_group_name = "euwest-cassandra"
   network_security_group_id = "${data.azurerm_network_security_group.worker-nsg.id}"
 
   ip_configuration {
     name                          = "myNicConfiguration"
     subnet_id                     = "${data.azurerm_subnet.default.id}"
     public_ip_address_id          = ""
     private_ip_address_allocation = "Dynamic"
   }
 }
 
 resource "azurerm_virtual_machine" "cassandra-servers" {
   count = "${var.nb_cassandra_servers}"
 
   name                  = "cassandra-server-${count.index}"
   location              = "westeurope"
   resource_group_name   = "euwest-cassandra"
   network_interface_ids = [
     "${element(azurerm_network_interface.cassandra-servers_interfaces.*.id, count.index)}"]
   vm_size               = "Standard_DS2_v2"
 
   storage_os_disk {
     name              = "cassandra-server-${count.index}_osdisk"
     caching           = "ReadWrite"
     create_option     = "FromImage"
     managed_disk_type = "Premium_LRS"
   }
 
   storage_image_reference {
     publisher = "credativ"
     offer     = "Debian"
     sku       = "9"
     version   = "latest"
   }
 
   os_profile {
     computer_name  = "test-cassandra-server-${count.index}"
     admin_username = "vlorentz"
   }
   os_profile_linux_config {
     disable_password_authentication = true
     ssh_keys {
       path = "/home/vlorentz/.ssh/authorized_keys"
       key_data = "${var.ssh_key_data}"
     }
   }
 
   storage_data_disk {
     name = "cassandra-server-${count.index}_datadisk0"
     lun = 0
     disk_size_gb = 64
     managed_disk_type = "Premium_LRS"
     create_option = "Empty"
   }
   storage_data_disk {
     name = "cassandra-server-${count.index}_datadisk1"
     lun = 1
     disk_size_gb = 64
     managed_disk_type = "Premium_LRS"
     create_option = "Empty"
   }
   storage_data_disk {
     name = "cassandra-server-${count.index}_datadisk2"
     lun = 2
     disk_size_gb = 64
     managed_disk_type = "Premium_LRS"
     create_option = "Empty"
   }
   storage_data_disk {
     name = "cassandra-server-${count.index}_datadisk3"
     lun = 3
     disk_size_gb = 64
     managed_disk_type = "Premium_LRS"
     create_option = "Empty"
   }
 }
 
 output "cassandra_servers_ips" {
   value = "${azurerm_network_interface.cassandra-servers_interfaces.*.private_ip_address}"
 }
 
 ##############################
 # Postgresql servers
 
 resource "azurerm_network_interface" "pgsql-servers_interfaces" {
   count = "${var.nb_pgsql_servers}"
 
   name                = "pgsql-servers-${count.index}_interface"
   location            = "westeurope"
   resource_group_name = "euwest-cassandra"
   network_security_group_id = "${data.azurerm_network_security_group.worker-nsg.id}"
 
   ip_configuration {
     name                          = "myNicConfiguration"
     subnet_id                     = "${data.azurerm_subnet.default.id}"
     public_ip_address_id          = ""
     private_ip_address_allocation = "Dynamic"
   }
 }
 
 resource "azurerm_virtual_machine" "pgsql-servers" {
   count = "${var.nb_pgsql_servers}"
 
   name                  = "pgsql-server-${count.index}"
   location              = "westeurope"
   resource_group_name   = "euwest-cassandra"
   network_interface_ids = [
     "${element(azurerm_network_interface.pgsql-servers_interfaces.*.id, count.index)}"]
   vm_size               = "Standard_DS2_v2"
 
   storage_os_disk {
     name              = "pgsql-server-${count.index}_osdisk"
     caching           = "ReadWrite"
     create_option     = "FromImage"
     managed_disk_type = "Premium_LRS"
   }
 
   storage_image_reference {
     publisher = "credativ"
     offer     = "Debian"
     sku       = "9"
     version   = "latest"
   }
 
   os_profile {
     computer_name  = "test-pgsql-server-${count.index}"
     admin_username = "vlorentz"
   }
   os_profile_linux_config {
     disable_password_authentication = true
     ssh_keys {
       path = "/home/vlorentz/.ssh/authorized_keys"
       key_data = "${var.ssh_key_data}"
     }
   }
 
   storage_data_disk {
     name = "pgsql-server-${count.index}_datadisk0"
     lun = 0
     disk_size_gb = 64
     managed_disk_type = "Premium_LRS"
     create_option = "Empty"
   }
   storage_data_disk {
     name = "pgsql-server-${count.index}_datadisk1"
     lun = 1
     disk_size_gb = 64
     managed_disk_type = "Premium_LRS"
     create_option = "Empty"
   }
   storage_data_disk {
     name = "pgsql-server-${count.index}_datadisk2"
     lun = 2
     disk_size_gb = 64
     managed_disk_type = "Premium_LRS"
     create_option = "Empty"
   }
   storage_data_disk {
     name = "pgsql-server-${count.index}_datadisk3"
     lun = 3
     disk_size_gb = 64
     managed_disk_type = "Premium_LRS"
     create_option = "Empty"
   }
 }
 
 output "pgsql_servers_ips" {
   value = "${azurerm_network_interface.pgsql-servers_interfaces.*.private_ip_address}"
 }
 
 
 ##############################
 # Client
 
 resource "azurerm_network_interface" "cassandra-clients_interfaces" {
   count = "${var.nb_clients}"
 
   name                = "cassandra-client-${count.index}_interface"
   location            = "westeurope"
   resource_group_name = "euwest-cassandra"
   network_security_group_id = "${data.azurerm_network_security_group.worker-nsg.id}"
 
   ip_configuration {
     name                          = "myNicConfiguration"
     subnet_id                     = "${data.azurerm_subnet.default.id}"
     public_ip_address_id          = ""
     private_ip_address_allocation = "Dynamic"
   }
 }
 
 resource "azurerm_virtual_machine" "cassandra-clients" {
   count = "${var.nb_clients}"
 
   name                  = "cassandra-client-${count.index}"
   location              = "westeurope"
   resource_group_name   = "euwest-cassandra"
   network_interface_ids = [
     "${element(azurerm_network_interface.cassandra-clients_interfaces.*.id, count.index)}"]
-  vm_size               = "Standard_DS2_v2"
+  vm_size               = "Standard_B4ms"
 
   storage_os_disk {
     name              = "cassandra-client-${count.index}_osdisk"
     caching           = "ReadWrite"
     create_option     = "FromImage"
     managed_disk_type = "Premium_LRS"
   }
 
   storage_image_reference {
     publisher = "credativ"
     offer     = "Debian"
     sku       = "9"
     version   = "latest"
   }
 
   os_profile {
     computer_name  = "test-cassandra-client-${count.index}"
     admin_username = "vlorentz"
   }
   os_profile_linux_config {
     disable_password_authentication = true
     ssh_keys {
       path = "/home/vlorentz/.ssh/authorized_keys"
       key_data = "${var.ssh_key_data}"
     }
   }
 
   storage_data_disk {
     name = "cassandra-client-${count.index}_datadisk0"
     lun = 0
     disk_size_gb = 256
     managed_disk_type = "Premium_LRS"
     create_option = "Empty"
   }
   storage_data_disk {
     name = "cassandra-client-${count.index}_datadisk1"
     lun = 1
     disk_size_gb = 256
     managed_disk_type = "Premium_LRS"
     create_option = "Empty"
   }
 }
 
 output "cassandra_clients_ips" {
   value = "${azurerm_network_interface.cassandra-clients_interfaces.*.private_ip_address}"
 }