diff --git a/run_ds.sh b/run_ds.sh
index 800d6b3..44aff89 100644
--- a/run_ds.sh
+++ b/run_ds.sh
@@ -1,6 +1,9 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
+# 可选：调试输出
+# [ "${DEBUG:-0}" = "1" ] && set -x
+
 export NCCL_DEBUG=INFO
 # 如走 IB/RoCE，请按实际网卡开启：
 # export NCCL_IB_HCA="mlx5_0,mlx5_1"
@@ -8,10 +11,14 @@ export NCCL_DEBUG=INFO
 # 纯以太：
 # export NCCL_SOCKET_IFNAME="eth0"
 
+# 解析脚本目录，避免相对路径问题
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+DS_CONFIG="${DS_CONFIG:-$SCRIPT_DIR/ds_config_zero3.json}"
+
 # ==== 超参数（本地路径；可用 VAR=xxx ./launch_ds.sh 覆写）====
 MODEL_NAME_OR_PATH="${MODEL_NAME_OR_PATH:-/home/test/Qwen3-8B}"
-DATA_GLOB="${DATA_GLOB:-/data/datasets/my_corpus/*.jsonl}"   # 每台机器都放相同路径
-OUTDIR="${OUTDIR:-/data/checkpoints/run-qwen3-8b}"           # 每台机器各自本地输出
+DATA_GLOB="${DATA_GLOB:-$HOME/datasets/my_corpus/*.jsonl}"   # 每台机器都放相同路径
+OUTDIR="${OUTDIR:-$HOME/checkpoints/run-qwen3-8b}"           # 每台机器各自本地输出
 SEQ_LEN="${SEQ_LEN:-4096}"
 LR="${LR:-2e-5}"
 GAS="${GAS:-64}"
@@ -19,10 +26,21 @@ LOG_STEPS="${LOG_STEPS:-10}"
 SAVE_STEPS="${SAVE_STEPS:-500}"
 MAX_STEPS="${MAX_STEPS:-10000}"
 
+# 轻量校验（只在发起节点做；远端各 rank 会在各自脚本里也 mkdir）
+[ -d "$MODEL_NAME_OR_PATH" ] || { echo "ERR: model not found at $MODEL_NAME_OR_PATH"; exit 1; }
+[ -f "$DS_CONFIG" ] || { echo "ERR: deepspeed config not found at $DS_CONFIG"; exit 1; }
+# 数据是通配符，这里只做一次“至少匹配到 1 个文件”的检查（发起节点）；各节点需自行确保相同路径存在
+shopt -s nullglob
+matches=( $DATA_GLOB )
+if [ ${#matches[@]} -eq 0 ]; then
+  echo "WARN: no files matched by DATA_GLOB=$DATA_GLOB on this node (确保每台机器该路径下有数据)"
+fi
+shopt -u nullglob
+
 mkdir -p "${OUTDIR}"
 
 # ==== 多机 DeepSpeed ====
-deepspeed --hostfile hostfile train_sft_ds.py \
+deepspeed --hostfile "$SCRIPT_DIR/hostfile" "$SCRIPT_DIR/train_sft_ds.py" \
   --model_name_or_path "${MODEL_NAME_OR_PATH}" \
   --data_glob "${DATA_GLOB}" \
   --output_dir "${OUTDIR}" \
@@ -35,6 +53,6 @@ deepspeed --hostfile hostfile train_sft_ds.py \
   --max_steps "${MAX_STEPS}" \
   --log_interval "${LOG_STEPS}" \
   --save_steps "${SAVE_STEPS}" \
-  --deepspeed ds_config_zero3.json \
+  --deepspeed "${DS_CONFIG}" \
   --gradient_checkpointing \
   --bf16
diff --git a/train_sft_ds.py b/train_sft_ds.py
index dc65a4e..79700b2 100644
--- a/train_sft_ds.py
+++ b/train_sft_ds.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 import os
 import glob
+import socket
 import argparse
 from typing import Dict, List, Iterable, Iterator
 
@@ -131,11 +132,21 @@ def main():
     if args.gradient_checkpointing:
         model.gradient_checkpointing_enable()
 
-    # 本地数据（每台机器同路径各自读取）
+    # ===== 数据鲁棒性检查（多机各自执行）=====
+    host = socket.gethostname()
+    rank = int(os.environ.get("RANK", "0"))
+
     files = sorted(glob.glob(args.data_glob))
     if len(files) == 0:
-        raise FileNotFoundError(f"No files match: {args.data_glob}")
+        raise FileNotFoundError(
+            f"[host={host} rank={rank}] No files matched DATA_GLOB={args.data_glob}\n"
+            "每台机器都必须在相同本地路径下放置数据；"
+            "可通过 DATA_GLOB=<your_glob> ./launch_ds.sh 覆写。"
+        )
+    if is_main_process():
+        print(f"[data] matched {len(files)} files on host={host}, example[0]={files[0]}", flush=True)
 
+    # streaming 逐行读取，字段名为 'text'
     dataset_iter = load_dataset(
         "json",
         data_files={"train": files},
@@ -149,38 +160,59 @@ def main():
             if isinstance(txt, str) and len(txt.strip()) > 0:
                 yield txt
 
-    train_stream = ConstantLengthDataset(texts_iter=text_iter(), tokenizer=tokenizer, seq_len=args.seq_len)
+    # 先构造一次流，做“非空探针”
+    train_stream_probe = ConstantLengthDataset(texts_iter=text_iter(), tokenizer=tokenizer, seq_len=args.seq_len)
+    _probe = iter(train_stream_probe)
+    try:
+        _ = next(_probe)  # 拉一个 chunk，确保真的能产出训练样本
+    except StopIteration:
+        raise RuntimeError(
+            f"[host={host} rank={rank}] 数据文件匹配到了，但没有产生任何可训练样本。\n"
+            "常见原因：jsonl 缺少 'text' 字段、内容全为空/空白行、或 --seq_len 过大。\n"
+            "请检查样例行，或将 --seq_len 调小后再试。"
+        )
 
+    # 探针消耗了流，重新构造一次“干净”的训练流
+    dataset_iter2 = load_dataset("json", data_files={"train": files}, split="train", streaming=True)
+    def text_iter2():
+        for ex in dataset_iter2:
+            txt = ex.get("text", None)
+            if isinstance(txt, str) and len(txt.strip()) > 0:
+                yield txt
+    train_stream = ConstantLengthDataset(texts_iter=text_iter2(), tokenizer=tokenizer, seq_len=args.seq_len)
+
+    # 可选 eval（从头部抽样）
     eval_dataset = None
     if args.eval_ratio and args.eval_ratio > 0:
-        # 简易 eval：从训练流头部抽若干 batch（可按需关闭）
         desired_eval_batches = 200
         gen = iter(train_stream)
         eval_samples = []
         for _ in range(desired_eval_batches):
-            try: eval_samples.append(next(gen))
-            except StopIteration: break
+            try:
+                eval_samples.append(next(gen))
+            except StopIteration:
+                break
         class ListDataset(torch.utils.data.Dataset):
             def __init__(self, items): self.items = items
             def __len__(self): return len(self.items)
             def __getitem__(self, idx): return self.items[idx]
         eval_dataset = ListDataset(eval_samples)
-        # 重新构造训练流
-        dataset_iter2 = load_dataset("json", data_files={"train": files}, split="train", streaming=True)
-        def text_iter2():
-            for ex in dataset_iter2:
+
+        # 抽样后再重建训练流，防止“吃掉”头部
+        dataset_iter3 = load_dataset("json", data_files={"train": files}, split="train", streaming=True)
+        def text_iter3():
+            for ex in dataset_iter3:
                 txt = ex.get("text", None)
                 if isinstance(txt, str) and len(txt.strip()) > 0:
                     yield txt
-        train_stream = ConstantLengthDataset(texts_iter=text_iter2(), tokenizer=tokenizer, seq_len=args.seq_len)
+        train_stream = ConstantLengthDataset(texts_iter=text_iter3(), tokenizer=tokenizer, seq_len=args.seq_len)
 
     data_collator = DataCollatorForLanguageModeling(tokenizer=tokenizer, mlm=False)
 
     os.makedirs(args.output_dir, exist_ok=True)
     logging_dir = os.path.join(args.output_dir, "logs")
 
-    # 关键点：无共享盘时，HF/DS 的分片 checkpoint 会在每个 rank 的本地 output_dir 下各自写入
-    # 训练恢复时，各 rank 从各自本地的相同路径读取自己的分片即可（保持相同 world_size 即可）
+    # 无共享盘：各 rank 在各自本地 output_dir 下写入自己的分片
     training_args = TrainingArguments(
         output_dir=args.output_dir,
         logging_dir=logging_dir,
@@ -208,7 +240,7 @@ def main():
         gradient_checkpointing=args.gradient_checkpointing,
         remove_unused_columns=False,
         torch_compile=False,
-        save_on_each_node=False   # 保持默认；DeepSpeed 的分片 checkpoint 本就会各 rank 本地写
+        save_on_each_node=False
     )
 
     trainer = Trainer(
@@ -226,10 +258,10 @@ def main():
                    and any(n.startswith("checkpoint-") for n in os.listdir(args.output_dir)))
     resume_flag = True if ckpt_exists else None
 
-    print_once(f"Resume = {resume_flag is True}")
+    print_once(f"[host={host}] Resume = {resume_flag is True}")
     print_once("***** Starting training *****")
     train_result = trainer.train(resume_from_checkpoint=resume_flag)
-    trainer.save_model()  # 配合 DS 配置中的 gather，会在全局 rank0 聚合保存 16-bit 整模型
+    trainer.save_model()  # 配合 DS 配置 stage3_gather_16bit_weights_on_model_save=true，仅在全局 rank0 聚合保存整模型
 
     metrics = train_result.metrics
     trainer.log_metrics("train", metrics)