diff --git a/hosts/skydick/datapool.nix b/hosts/skydick/datapool.nix
index b910287..a6cf029 100644
--- a/hosts/skydick/datapool.nix
+++ b/hosts/skydick/datapool.nix
@@ -403,9 +403,19 @@
 
   systemd.services.nfsd-rdma-listener = {
     description = "Enable NFS-over-RDMA listener on port 20049";
-    after = [ "nfs-server.service" ];
-    wants = [ "nfs-server.service" ];
-    wantedBy = [ "multi-user.target" ];
+    # `after` orders the unit at boot.
+    # `wants` brings it up when the target activates.
+    # `partOf` (NEW) propagates restart: whenever nfs-server.service
+    # cycles, systemd re-runs THIS unit's ExecStart. Without partOf
+    # the listener stays in "exited (success)" state, but nfsd's
+    # kernel-side portlist gets wiped on every nfs-server stop, so
+    # the RDMA port goes dead silently. Caught 2026-05-26 after a
+    # `nixos-rebuild switch` left port 20049 down for ~14h — every
+    # NFS-RDMA client (door-pek) hung on every mount-touching read.
+    after    = [ "nfs-server.service" ];
+    wants    = [ "nfs-server.service" ];
+    partOf   = [ "nfs-server.service" ];
+    wantedBy = [ "multi-user.target" "nfs-server.service" ];
     serviceConfig = {
       Type = "oneshot";
       RemainAfterExit = true;