② 低權限「一鍵巡檢」面板 把下面存成 nfs-watch.sh（單檔自畫面迴圈），一般使用者可直接跑：

nfs-watch.sh

#!/usr/bin/env bash
# nfs-watch.sh -- user-mode NFS watch panel (no sudo)
INT=${1:-2}   # 重新整理秒數，預設 2s

have_nfsiostat=0
command -v nfsiostat >/dev/null 2>&1 && have_nfsiostat=1

while true; do
  clear
  echo "NFS Watch  | host=$(hostname)  time=$(date '+%F %T')  refresh=${INT}s"
  echo "--------------------------------------------------------------------------"

  echo "[Mounts]"
  grep -E ' nfs[34]? ' /proc/mounts | sed 's/^/  /'; echo

  echo "[Client RPC (retrans/timeout)]"
  nfsstat -c -o net,rpc 2>/dev/null | sed 's/^/  /' || echo "  (nfsstat 不可用)"
  echo

  if [ "$have_nfsiostat" -eq 1 ]; then
    echo "[nfsiostat snapshot]"
    nfsiostat -h 1 1 2>/dev/null | awk '
      /^\/|^[A-Za-z0-9\.\-]+:\/.* mounted on /{gsub(" mounted on "," -> ");print "  " $0}
      /avg RTT|avg exe|rpc bklog|read:|write:/{gsub(/^[ \t]+/,"",$0);print "    " $0}
    '
    echo
  else
    echo "[nfsiostat 不可用；改顯示 mountstats 標記行]"
    grep -A4 -E '^device .+ nfs' /proc/self/mountstats | egrep -n 'device|READ|WRITE|rpc|rtt|exe' | sed 's/^/  /'
    echo
  fi

  echo "[Top I/O PIDs (pidstat -d)]"
  pidstat -d 1 1 2>/dev/null | tail -n +4 | sort -k7,7nr | head -n 8 | sed 's/^/  /'
  echo

  echo "[NFS TCP Connections (:2049)]"
  ss -tan 2>/dev/null | awk '/:2049/ && /ESTAB/ {print $5}' | sed "s/:.*//" | sort | uniq -c | sort -nr | sed 's/^/  /' || echo "  (ss 不可用)"
  echo

  echo "判讀提示：exe≫rtt→伺服器/磁碟忙；rtt高+retrans/timeout升→網路；bklog升+連線少→並行度不足。"
  sleep "$INT"
done