vSAN -- Multiple Disks: Disk latencies / Power-on Resets

Products

• VMware vSAN

Issue/Introduction

Symptoms:

• Multiple Disk latency spikes seen in vCenter Web Client Latency graphs (= Host Level - Disks )
• Messages referring to multiple disks on one vSAN Host are observed in one or both of the following logs: 

/var/log/vmkernel.log

/var/log/vobd.log

 

YYYY-MM-DDTHH:MM:SSZ vobd: Power-on Reset occurred on ################

YYYY-MM-DDTHH:MM:SSZ vobd: Power-on Reset occurred on ################

Environment

vSAN (All Versions)

Cause

Since the Symptoms outlined above are observed for multiple or all Disks on the vSAN Host:

Issue with Backplane controller

Resolution

Contact Hardware Vendor to have Host Backplane controller checked.