diff --git a/modules/cluster/default.nix b/modules/cluster/default.nix
index 88507a60..57d95a55 100644
--- a/modules/cluster/default.nix
+++ b/modules/cluster/default.nix
@@ -101,6 +101,9 @@ in {
       rbdPools.microvms = {
         params = { size = 2; class = "ssd"; };
       };
+      rbdPools.microvms-hdd = {
+        params = { size = 2; class = "hdd"; };
+      };
       cephfs.home.mountPoint = skyflakeHome;
       # Legacy: migration to rbd
       cephfs.skyflake.mountPoint = "/storage/cephfs";