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RAID组不平衡导致写入延迟

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适用场景

  • ONTAP

问题描述

  • 应用程序或VM报告运行时很减。
  • 延迟可从命令中的数据层或   AIQ卷延迟(组件)视图中的WAFL Susp CP报告

cluster1::> qos statistics volume latency show -vserver vs0 -volume vs0_vol0
Workload       ID   Latency   Network   Cluster     Data     Disk    QoS    NVRAM    Cloud
--------------- ------ ---------- ---------- ---------- ---------- ---------- ------- ---------- ----------
vs0_vol0-wid1..  15658   42.8ms    155.00us    0ms     28.7ms    14.1ms   0ms     0ms    0ms
vs0_vol0-wid1..  15658   31.6ms    128.00us    0ms     23.5ms    8.1.ms   0ms     0ms    0ms
vs0_vol0-wid1..  15658   47.1ms    130.00us    0ms     32.8ms    14.3ms   0ms     0ms    0ms
vs0_vol0-wid1..  15658   30.2ms    137.00us    0ms     19.2ms    11.0ms   0ms     0ms    0ms
vs0_vol0-wid1..  15658   42.4ms    143.00us    0ms     32.8ms    9.60ms   0ms     0ms    0ms

  • systat -x输出显示CP类型CP_Ty B (背靠背) CPS的证据。

非Af控制器更容易受到此问题描述 的影响

  • 没有直接迹象表明存在磁盘瓶颈。
  • Statut 显示、其中一个RAID组包含一个或极少数数据磁盘、并且磁盘利用率不会均匀分布在各个RAID组中。
disk ut% xfers ureads--chain-usecs writes--chain-usecs cpreads-chain-usecs greads--chain-usecs gwrites-chain-usecs /aggr0/plex0/rg0: 0a.03.0 1 5.76 0.00 .... . 3.79 47.02 21 1.97 18.21 31 0.00 .... . 0.00 .... . 0b.03.1 1 5.76 0.00 .... . 3.80 46.91 21 1.96 18.09 31 0.00 .... . 0.00 .... . 0b.00.1 83 228 0.07 10.00 44 6.16 39.95 19 0.06 38.16 38 0.00 .... . 0.00 .... . 0b.00.2 80 215 58.04 2.85 243 6.14 40.02 19 0.28 5.26 85 0.00 .... . 0.00 .... . /aggr0/plex0/rg1: 0a.01.0 1 120.54 0.00 .... . 54.37 57.82 14 66.17 44.91 20 0.00 .... . 0.00 .... . 0b.00.8 1 120.54 0.00 .... . 54.38 57.81 19 66.16 44.91 23 0.00 .... . 0.00 .... . 0a.01.1 43 185.28 2061.95 4.04 135 57.25 32.25 20 66.09 12.07 60 0.00 .... . 0.00 .... . 0b.00.9 55 180.00 2057.09 4.04 150 57.25 32.29 23 65.66 12.11 74 0.00 .... . 0.00 .... . 0a.01.2 44 176.64 2054.20 4.02 141 56.59 32.40 20 65.85 12.20 62 0.00 .... . 0.00 .... . 0b.00.10 56 166.30 2043.93 4.03 163 56.86 32.45 24 65.50 12.31 73 0.00 .... . 0.00 .... . 0a.01.3 73 179.01 2056.35 4.02 136 57.05 32.43 20 65.62 12.19 60 0.00 .... . 0.00 .... . 0b.00.11 75 162.22 2039.31 4.03 149 57.16 32.20 24 65.74 12.25 71 0.00 .... . 0.00 .... . 0a.01.4 63 177.86 2055.72 4.00 138 56.69 32.51 21 65.45 12.40 61 0.00 .... . 0.00 .... . 0b.00.22 55 169.34 2046.18 4.02 156 56.96 32.21 25 66.20 12.36 73 0.00 .... . 0.00 .... . 0a.01.6 74 174.07 2051.05 4.03 139 57.32 32.47 21 65.70 12.02 62 0.00 .... . 0.00 .... . 0b.00.13 25 163.94 2041.44 4.02 150 56.64 32.27 26 65.86 12.38 75 0.00 .... . 0.00 .... . <<<<<< 0b.00.14 21 165.87 2044.10 4.01 149 56.39 32.49 27 65.38 12.20 72 0.00 .... . 0.00 .... . 0b.00.23 15 170.28 2047.49 4.00 150 56.80 32.12 28 65.99 12.13 73 0.00 .... . 0.00 .... .

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