vSAN ESA Unmap latency

Products

• VMware vSAN

Issue/Introduction

The Unmap Latency Spike was observed on the esxi hosts every day for ~10 minutes. Also there are a mix of Linux and Windows Guest OS VMs.

Environment

VMware vSAN ESA  8.0

Cause

No production impact or  impacting applications or users while the unmaps were observed.

Resolution

The unmap latency in the graphs is for the actual Unmap process itself which isn't priority traffic and thus may be throttled on and off to some extent frequently so as not to impinge on the performance of traffic that is priority (e.g. VM IOs) .