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How to identify high-latency volumes with truncated volume names

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Applies to

  • ONTAP 9
  • Quality of Service (QoS)
  • Volume names with more than 15 characters
  • Autovolume workloads
  • Workload ID (WID)

Description

The following CLI commands could be used to identify the volumes with high latency quickly.

  • qos statistics volume latency show
  • qos statistics volume performance show
  • qos statistics workload latency show
  • qos statistics workload performance show

     

This shows the Top 10 workloads with the highest latency in the first column of the command output (Workload column).

Example:

Cluster::>  qos statistics volume latency show
Workload         ID     Latency     Network    Cluster    Data       Disk       QoS         NVRAM      Cloud 
---------------  ------ ----------  ---------- ---------- ---------- ---------- ----------  ---------- ---------- 
-total-          -      1277.00us   251.00us   0ms        553.00us   473.00us   0ms         0ms        0ms 
VOL_VMware_te..  19547  41.50ms     2.69ms     9.00us     29.68ms    9.13ms     0ms         0ms        0ms     
VOL_VMware_te..  5658   16.00ms     3.58ms     8.00us     11.80ms    619.00us   0ms         0ms        0ms        
vol1-wid28961    28961  13.28ms     3.67ms     3.00us     9.44ms     159.00us   0ms        0ms         0ms 

Note:

  • WID 19457 refers to the autovolume workload with volume VOL_VMWARE_testing1
  • WID 5658 refers to the autovolume workload with volume VOL_VMWARE_testing2
  • They are displayed identically after truncation 

This is the expected behavior - up to 15 characters could be displayed in the Workload column. Any workloads with more than 15 characters would be truncated to 13 characters plus two dots at the end.

 

If there are multiple long volume names in a similar naming convention, it could be difficult to narrow down the exact volumes of interest as multiple volumes might share the same workload name displayed in the Workload column after truncation.

This article provides a way to find out the volumesof interest based on the WID displayed in the ID column. 

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