diff --git a/hosts/skydick/datapool.nix b/hosts/skydick/datapool.nix
index d2f5768..c66abb4 100644
--- a/hosts/skydick/datapool.nix
+++ b/hosts/skydick/datapool.nix
@@ -221,18 +221,22 @@
 { config, pkgs, ... }:
 
 {
-  # Build sambaFull with Spotlight/tracker + SMB Direct support.
+  # Build sambaFull with Spotlight/tracker support.
   # Fixes for tinysparql 3.x (tracker-sparql-3.0) compatibility:
   #   (1) waf only checks tracker-sparql-{2.0..0.14} — add 3.0
   #   (2) tracker 2.x API (get_async/get_finish) removed in 3.x — replace
   #       with bus_new_async/bus_new_finish connecting to localsearch miner
   #   (3) disable tevent_glib_tracker test (uses same removed API, test-only)
   #   (4) add icu for Unicode normalisation required by Spotlight
-  # SMB Direct:
-  #   (5) link against rdma-core (libibverbs + librdmacm) and pass
-  #       --with-smb-direct so smbd advertises capability 0x40 on protocol
-  #       negotiate. Lets Sequoia 15.4+ Macs upgrade SMB3 sessions onto the
-  #       RoCE fabric (same NIC/bond as NFS-RDMA, distinct fabric port 5445).
+  #
+  # SMB Direct (SMB3-over-RDMA) is NOT enabled: upstream Samba's userspace
+  # smbd does not implement an RDMA transport, even with --with-smb-direct
+  # passed (waf silently accepts the flag but the produced smbd contains
+  # no ibverbs code). The kernel server `ksmbd` does support SMB Direct,
+  # but switching would lose LDAP-backed posix users, Spotlight, fruit
+  # metadata and Time Machine — features that all live in userspace Samba.
+  # See: NFS-over-RDMA is on the same fabric and covers the bulk-throughput
+  # use case; SMB stays on TCP for now.
   nixpkgs.overlays = [
     (final: prev: {
       sambaFull = prev.sambaFull.overrideAttrs (old: {
@@ -240,10 +244,6 @@
           final.tinysparql.dev
           final.glib.dev
           final.icu.dev
-          final.rdma-core
-        ];
-        configureFlags = (old.configureFlags or []) ++ [
-          "--with-smb-direct"
         ];
         postPatch = (old.postPatch or "") + ''
           substituteInPlace source3/wscript \
@@ -482,18 +482,6 @@
         "map to guest" = "never";
         "server min protocol" = "SMB2_10";
 
-        # SMB-Direct (SMB3 over RDMA, port 5445). Requires the sambaFull
-        # override above to be built --with-smb-direct AND a client that
-        # supports it (Win 10 Pro for Workstations, Win Server, macOS
-        # Sequoia 15.4+). For clients without SMB-Direct, smbd silently
-        # falls back to plain TCP on 445.
-        "smb direct" = "yes";
-        # Max single RDMA read/write per call. 8 MiB matches our NFS
-        # rsize/wsize so SMB and NFS use comparable transfer sizes over
-        # the same fabric.
-        "smb direct max read" = "8388608";
-        "smb direct max write" = "8388608";
-
         "load printers" = "no";
         "vfs objects" = "catia fruit streams_xattr recycle";
         "fruit:metadata" = "stream";