503 Service Unavailable in vCenter Server Appliance 6.5

Many people are reporting issues with the vCenter Server Appliance part of vSphere 6.5. Like ‘503 Service Unavailable’. 

Anton Spiteri describes the issue here.

To make a long story short: this issue most likely is related to storage issues. VCSA is very sensitive to latency of the storage system it runs on. I experienced myself a vCenter appliance which entered an emergency state after a reboot. By fixing the disk I was able to get the VCSA up and running again. This blogpost explains how.

VCSA rebooted after one of my co-workers deployed a new virtual machine having a rather large disk installed on the same storage. In  my case the storage was part of a temporary environment running Windows Server 2012 with a NFS export.

This post explains that increasing the SCSI timeout solves the issues.

A better option would be to upgrade the VCSA to 6.5 U1a.

Update 1a contains some critical security updates.


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