NetWorker：如何使用 ddboost_precert.log 分析 IO 效能

Summary: 本文提供如何使用 precert-io-perf.py Python 指令檔從 ddboost_precert.log 檔案分析 I/O 效能的逐步指示。該腳本計算寫入和讀取操作的各種統計資訊，包括持續時間和輸送量 （MB/s），並提供技術和非技術利益相關者可以理解的全面摘要。

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Instructions

在 NetWorker Client Direct 備份問題被認為與用戶端的 Data Domain DD Boost 程式庫有關的情況下，會啟用預先認證紀錄記錄作為故障診斷步驟。此公用程式可以從收集的 precert 記錄中識別效能問題。


準備ddboost_precert.log

作為一個簡單的使用範例，創建 ddboost_precert.ini 在 UNIX 根目錄上，或 Windows 的 C：\ 根目錄上。檔案應包含：  
precert_enabled=true
num_log_files=4
log_file_size=512
log_file_name=ddboost_precert.log
log_file_dir=/DDLog
ddcl_logs_include=true
ddcl_logs_sev=4
請參閱文章 Data Domain：使用 precert 工具啟用 DD Boost API 紀錄 （precert 記錄），以取得收集 precert 記錄的完整程序詳細資料。（需要登入 Dell 支援才能檢視此文章）


準備使用文稿

先決條件：  Python 3.x
從以下位置下載指令檔：解決方案 NetWorker 工具 （dell.com）
  1. 將指令檔儲存至含有 precert 記錄的工作目錄 precert-io-perf.py。
  2. 在 UNIX 系統上，請確定指令檔可執行： chmod +x precert-io-perf.py
  3. 執行指令檔： ./precert-io-perf.py

輸入提示

  • 出現提示時，輸入 DD Boost precert 記錄檔的完整路徑。
  • 當系統提示是否要為每個 I/O 作業包括 MB/s 時，輸入是或否

輸出摘要

此指令檔會顯示寫入和讀取作業的摘要，包括：
  • 寫入和讀取操作的總數
  • 平均寫入和讀取持續時間
  • 最大和最小寫入和讀取持續時間及其各自的輸送量 （MB/s）
  • 總寫入和讀取時間
  • 花在書寫和讀取上的總時間百分比
  • 平均寫入和讀取輸送量 （MB/s）
  • 詳細的 I/O 作業
該文稿將詳細的 I/O 操作記錄到兩個 CSV 檔：
  • io-write.log - 包含每個寫入操作的詳細資訊
  • io-read.log - 包含每個讀取操作的詳細資訊


輸出範例

# ./precert-io-perf.py
Please enter the full path to the log file: ./ddboost_precert.log
Do you want to include MB/s for each I/O operation? (yes/no): yes

    Write Durations Summary:

    Total number of write operations: 2646
    Average write duration: 0.005389 seconds
    Maximum write duration: 0.041000 seconds (24.39 MB/s)
    Minimum write duration: 0.000001 seconds (1000000.00 MB/s)
    Total write time: 14.259001 seconds
    Percentage of total time spent on writes: 22.99%
    Average write throughput: 185.566997 MB/s
    Note: High MB/s values for very short durations indicate efficient operations.


    Read Durations Summary:

    Total number of read operations: 2651
    Average read duration: 0.018018 seconds
    Maximum read duration: 31.838000 seconds (0.03 MB/s)
    Minimum read duration: 0.001000 seconds (1000.00 MB/s)
    Total read time: 47.766000 seconds
    Percentage of total time spent on reads: 77.01%
    Average read throughput: 55.499728 MB/s
    Note: High MB/s values for very short durations indicate efficient operations.


Top 20 Slowest Write I/O Operations:
1. I/O Number: 608, Duration: 0.041000 seconds, MB/s: 24.39
2. I/O Number: 2276, Duration: 0.038000 seconds, MB/s: 26.32
3. I/O Number: 1548, Duration: 0.025000 seconds, MB/s: 40.00
4. I/O Number: 2076, Duration: 0.025000 seconds, MB/s: 40.00
5. I/O Number: 636, Duration: 0.024000 seconds, MB/s: 41.67
6. I/O Number: 195, Duration: 0.023000 seconds, MB/s: 43.48
7. I/O Number: 892, Duration: 0.023000 seconds, MB/s: 43.48
8. I/O Number: 1451, Duration: 0.023000 seconds, MB/s: 43.48
9. I/O Number: 1539, Duration: 0.023000 seconds, MB/s: 43.48
10. I/O Number: 1987, Duration: 0.023000 seconds, MB/s: 43.48
11. I/O Number: 604, Duration: 0.022000 seconds, MB/s: 45.45
12. I/O Number: 896, Duration: 0.022000 seconds, MB/s: 45.45
13. I/O Number: 1283, Duration: 0.022000 seconds, MB/s: 45.45
14. I/O Number: 1532, Duration: 0.022000 seconds, MB/s: 45.45
15. I/O Number: 1544, Duration: 0.022000 seconds, MB/s: 45.45
16. I/O Number: 595, Duration: 0.021000 seconds, MB/s: 47.62
17. I/O Number: 616, Duration: 0.021000 seconds, MB/s: 47.62
18. I/O Number: 652, Duration: 0.021000 seconds, MB/s: 47.62
19. I/O Number: 1512, Duration: 0.021000 seconds, MB/s: 47.62
20. I/O Number: 1552, Duration: 0.021000 seconds, MB/s: 47.62

Top 20 Slowest Read I/O Operations:
1. I/O Number: 5900, Duration: 31.838000 seconds, MB/s: 0.03
2. I/O Number: 1614, Duration: 0.041000 seconds, MB/s: 24.39
3. I/O Number: 4950, Duration: 0.039000 seconds, MB/s: 25.64
4. I/O Number: 4550, Duration: 0.026000 seconds, MB/s: 38.46
5. I/O Number: 1670, Duration: 0.025000 seconds, MB/s: 40.00
6. I/O Number: 3494, Duration: 0.025000 seconds, MB/s: 40.00
7. I/O Number: 788, Duration: 0.023000 seconds, MB/s: 43.48
8. I/O Number: 1606, Duration: 0.023000 seconds, MB/s: 43.48
9. I/O Number: 2182, Duration: 0.023000 seconds, MB/s: 43.48
10. I/O Number: 3300, Duration: 0.023000 seconds, MB/s: 43.48
11. I/O Number: 3476, Duration: 0.023000 seconds, MB/s: 43.48
12. I/O Number: 3486, Duration: 0.023000 seconds, MB/s: 43.48
13. I/O Number: 4372, Duration: 0.023000 seconds, MB/s: 43.48
14. I/O Number: 2190, Duration: 0.022000 seconds, MB/s: 45.45
15. I/O Number: 2964, Duration: 0.022000 seconds, MB/s: 45.45
16. I/O Number: 3422, Duration: 0.022000 seconds, MB/s: 45.45
17. I/O Number: 3462, Duration: 0.022000 seconds, MB/s: 45.45
18. I/O Number: 4628, Duration: 0.022000 seconds, MB/s: 45.45
19. I/O Number: 5548, Duration: 0.022000 seconds, MB/s: 45.45
20. I/O Number: 1588, Duration: 0.021000 seconds, MB/s: 47.62
Detailed I/O operations have been logged to io-write.log and io-read.log


example of above analysis:

Percentage of total time spent on writes: 22.99%
Percentage of total time spent on reads: 77.01%

此示例演示性能問題如何在數據的讀取操作而不是寫入操作中出現。

Affected Products

Data Domain Boost, NetWorker
Article Properties
Article Number: 000227597
Article Type: How To
Last Modified: 05 Sep 2024
Version:  2
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