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在MetroCluster环境中、因写入工作负载笨重而导致性能问题描述

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perf<a>2009565949</a>
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适用场景

  • ONTAP 9
  • MCC环境

问题描述

  • 受影响节点上的所有卷均报告运行很减分。
  • 可从Data和NVLOG查看QoS统计信息中的延迟。
cluster::> qos statistics volume latency show
 
Workload     ID   Latency   Network   Cluster    Data    Disk    QoS    NVRAM    Cloud
------------ ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
volume_1    17882   10ms    0.01ms   0ms     4.5ms     1ms    0ms     3.4ms   0ms
volume_2    5232   12ms    0.02ms   0ms     5.05ms     1ms    0ms     5.90ms  0ms
volume_3    17160   14ms    0.05ms   0ms     4.25ms     1ms    0ms     8.75ms  0ms
 
  • 随着单个卷上的工作负载增加、CPU利用率也随之提高(接近100%)。
  • 可以通过sysstat和QoS statics 命令来观察CPU利用率和前几个会话。
 

Cluster::> node run node1 sysstat -x 1
CPU    NFS   CIFS   HTTP   Total       Net   kB/s    Disk   kB/s  
                                        in    out    read  write  
79%  22453      0      0   22463  491948   8098  64188  631848
92%  122448     0      0   122448 1492337   8121  07184  1158216 <<<
95%  122578     0      0   122578 1492134   8106   78844  1501992
100% 123453     0      0   123453 1492587   8108  10668  1736420 

 

Cluster1::> qos statistics workload resource cpu show -node node1 -iterations 100 -rows 3
Workload      ID  CPU
--------------- ----- -----
vs0-wid-102    102   60%
file-bigvmdk-..  121   2%
vs2_vol0-wid-..  212   2%
vs0-wid-101    102   5%
file-bigvmdk-..  121   2%
vs2_vol0-wid-..  212   1%
 
  • 此类笨重的卷上的大多数工作负载都是其他和写入操作、它们需要 通过ISL链路记录到镜像集群上的远程NVRAM。 
  • ISL利用率提高会导致缓冲区信用被剥夺。 

 

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