High latency is observed on storage and virtual machines

Products

• VMware vCenter Server
• VMware vSphere ESXi 8.0
• VMware vSphere ESX 8.x
• VMware vSphere ESX 7.x
• VMware vSphere ESX 6.x

Issue/Introduction

• VMs have poor performance with high latency.
• Under esxtop Storage Device Panel, high DAVG, KAVG and GAVG is observed
• Under esxtop Storage Device Panel (press 'u' to get storage devices), High number with QUED and 100% with %USD

Environment

VMware vSphere ESXi 7.x
VMware vSphere ESXi 8.x

Cause

Backend storage can not process the IO from ESX within the expected time.

Resolution

Consult storage vendor to improve the performance at the backend.

Additional Information

• To understand storage utilization statistics under esxtop, please refer Storage Device Panel and refer Checking the queue depth of the storage adapter and the storage device to check storage utilization statistics.
• Please refer KB : Using esxtop to identify storage performance issues for ESXi for using esxtop to identify storage performance issues on ESXi