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由于用户工作负载的磁盘瓶颈而导致高读取或写入延迟

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适用于

  • ONTAP 9
  • 带有硬盘(SATA 或 SAS)磁盘的 FAS 系统

问题描述

  • 位于 SATA 或 SAS 磁盘聚合上且高度利用(100%)的卷出现读取和写入操作的高延迟
  • 复制大文件(如 100MB+)失败。
  • 如果客户正在使用虚拟环境,虚拟机可能会变得无响应。
  • 由于磁盘利用率高,备份速度缓慢
  • 可能会面临从容量层到性能层的数据检索速度缓慢
  • 使用 cp 命令时,从一个集群到另一个集群的用户复制速度缓慢
  • 使用 statit 识别包含卷的聚合中是否存在高磁盘利用率或延迟
    disk ut% xfers ureads--chain-usecs writes--chain-usecs cpreads-chain-usecs greads--chain-usecs gwrites-chain-usecs /data_aggr1/plex0/rg0: 0a.11.1 10 23.42 0.00 .... . 11.21 61.56 133 12.21 57.15 50 0.00 .... . 0.00 .... . 0a.10.1 11 23.80 0.00 .... . 11.66 59.25 147 12.14 57.37 55 0.00 .... . 0.00 .... . 1a.12.1 100 158.69 120.29 5.43 2299 10.26 34.39 553 28.15 9.93 839 0.00 .... . 0.00 .... . 0a.11.2 100 156.09 118.85 5.39 2253 9.96 34.97 553 27.28 10.05 794 0.00 .... . 0.00 .... . 0a.10.2 100 158.41 121.44 5.35 2337 9.95 35.11 542 27.01 9.93 835 0.00 .... . 0.00 .... . 0a.12.2 100 153.05 115.90 5.59 2158 9.88 35.00 524 27.27 9.97 803 0.00 .... . 0.00 .... . 0a.11.3 100 162.10 124.59 5.45 2262 10.05 35.10 528 27.45 10.10 809 0.00 .... . 0.00 .... . 0a.10.3 100 158.72 121.88 5.39 2298 9.82 34.82 573 27.02 10.05 838 0.00 .... . 0.00 .... . 1a.12.3 100 157.60 120.63 5.49 2274 9.85 34.90 571 27.11 9.82 875 0.00 .... . 0.00 .... . 0a.11.4 100 157.67 120.74 5.39 2328 9.96 35.29 568 26.97 10.10 857 0.00 .... . 0.00 .... . 0a.10.4 100 156.72 119.29 5.64 2180 9.96 34.65 556 27.47 9.79 825 0.00 .... . 0.00 .... .
  • 客户端遇到性能降级
  • 监控集群的 Active IQ Unified Manager (AIQUM) 引发更高延迟的警报
    • 示例:Latency value of XX.X ms/op on volname has triggered a WARNING event based on threshold setting of 20.0 ms/op.
  • 读取延迟为 25~40ms
  • 根据 sysstat -x,磁盘利用率高(为可读性而删除的列):
    •  CPU ... HDD ... util 10% ... 90% 9% ... 100% 

 

 

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