How to reduce Data Processing latency

Applies to

• ONTAP 9
• Performance Troubleshooting
• High Data  latency in qos statistics volume latency show

Description

This article is part of the ONTAP Data Processing latency - Resolution Guide

Procedure

• If the workload is foreground:
  • Migrate volume(s) to less utilized node.
  • Use QoS ceilings to limit workloads.
  • Identify top workloads.
  • Use multiple volumes instead of one.
  • Migrate workload using host-side tools such as VMotion or XCP.
  • Reduce user work
    • Or stagger jobs to reduce load.
  • _ocs_vserver is offloaded foreground work.
• If the workload is background.
  • Check for SnapMirror.
  • Check for volume moves.
  • Check for deduplication.
    • Adjust the scheduling.
    • Disable inline compression on volumes hosted on SATA.
  • Reduce/stagger snapshot schedules.
    • Check for WAFL scanners.
    • With a large number of concurrent snapshot scanners, schedules may need adjusting.
  • Check for tape/NDMP Backup jobs.