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Write latency and low throughput on Metrocluster Environment

Views:
109
Visibility:
Public
Votes:
1
Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

  • ONTAP 9

Issue

  • High write latency on Metrocluster systems
  • Low number of IOPS can be seen than the expected IOPS
  • From CLI, Check using command qos statistics volume latency show 

Example:

cluster::> qos statistics volume latency show -node node1

Workload        ID    Latency    Network    Cluster       Data       Disk      QoS      NVRAM      Cloud 

------------ ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- -

volume_1      12578     10ms      1ms        0ms         0.5us         1ms      0ms       9ms        0ms  volume_2       5232     2ms       1ms        0ms         0.25us        1ms      0ms      0ms        0ms  volume_3      17160     1ms       1ms        0ms         0.25us        1ms      0ms      0ms        0ms  

The above example means that the volume_1 is impacted by NVLog Transfer latency

 

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