diff --git a/modules/zfs.nix b/modules/zfs.nix
index b2a9b6d..ae377bc 100644
--- a/modules/zfs.nix
+++ b/modules/zfs.nix
@@ -34,7 +34,7 @@ in
     in
     [
       "zfs.zfs_arc_max=${builtins.toString b}"
-      "zfs.zfs_txg_timeout=30" # longer TXG open time = larger sequential writes = better HDD throughput
+      "zfs.zfs_txg_timeout=120" # longer TXG open time = larger sequential writes
       "zfs.zfs_dirty_data_max=8589934592" # 8GB dirty data buffer (default 4GB) for USB HDD write smoothing
       "zfs.zfs_delay_min_dirty_percent=80" # delay write throttling until 80% dirty (default 60%)
       "zfs.zfs_vdev_async_write_max_active=30" # more concurrent async writes to vdevs (default 10)