diff --git a/ops/nixos/lib/blade.nix b/ops/nixos/lib/blade.nix
index e8208b67d9..4459f4eb39 100644
--- a/ops/nixos/lib/blade.nix
+++ b/ops/nixos/lib/blade.nix
@@ -165,6 +165,16 @@ in {
       mgr.daemons = [ config.networking.hostName ];
       mgr.enable = config.services.ceph.mon.enable;
       rgw.enable = true;
+      client.enable = true;
+      client.extraConfig = {
+        "client.libvirt" = {
+          rbd_cache = "true";
+          rbd_cache_policy = "writeback";
+          rbd_cache_size = "2Gi";
+          rbd_cache_max_dirty = "1792Mi";
+          rbd_cache_target_dirty = "128Mi";
+        };
+      };
     };
     systemd.services.ceph-osd-lvm-activate = lib.mkIf config.services.ceph.osd.enable {
       enable = true;