diff --git a/environments/.stackhpc/SMS.pkrvars.hcl b/environments/.stackhpc/SMS.pkrvars.hcl
index b88106fe8..e78994878 100644
--- a/environments/.stackhpc/SMS.pkrvars.hcl
+++ b/environments/.stackhpc/SMS.pkrvars.hcl
@@ -1,4 +1,7 @@
 flavor = "general.v1.small"
+use_blockstorage_volume = true
+volume_size = 15 # GB
+image_disk_format = "qcow2"
 networks = ["e2b9e59f-43da-4e1c-b558-dc9da4c0d738"] # stackhpc-ipv4-geneve
 ssh_keypair_name = "slurm-app-ci"
 ssh_private_key_file = "~/.ssh/id_rsa"