diff --git a/modules/ntfy-alerts.nix b/modules/ntfy-alerts.nix
index 6446e05..e9e6b03 100644
--- a/modules/ntfy-alerts.nix
+++ b/modules/ntfy-alerts.nix
@@ -97,6 +97,10 @@ in
         };
       };
 
+      # TODO: sanoid's ExecStartPre runs `zfs allow` which blocks on TXG sync;
+      # on the hdds pool (slow spinning disks + large async frees) this causes
+      # 30+ minute hangs and guaranteed timeouts.
+      "sanoid".unitConfig.OnFailure = lib.mkForce "";
     };
 
     # Global OnFailure drop-in for all services