Stretching cluster from SDDC is failing with error VALIDATE_HA_DEFAULT_CONFIGURATION_FAILED > caused by: Cannot read the array length because "<local3>" is null

Products

• VMware SDDC Manager / VCF Installer

Issue/Introduction

When trying to Stretch vSan cluster from SDDC task is failing on subtask "VALIDATE_HA_DEFAULT_CONFIGURATION"

You confirmed that HA is ON in vCenter and there are no errors or warning messages related to HA in vCenter UI


In SDDC UI when expanding subtask you see similar message 

VALIDATE_HA_DEFAULT_CONFIGURATION_FAILED > caused by: Cannot read the array length because "<local3>" is null

 

In domain manger logs you see similar entries 

 

ERROR [vcf_dm,########,####] [c.v.e.s.o.model.error.ErrorFactory,dm-exec-##]  [####] VALIDATE_HA_DEFAULT_CONFIGURATION_FAILED Validation for default HA configuration failed for cluster 
####
com.vmware.evo.sddc.orchestrator.exceptions.OrchTaskException: Validation for default HA configuration failed for cluster #####
....
Caused by: java.lang.NullPointerException: Cannot read the array length because "<local3>" is null

Environment

SDDC 5.2

Cause

When Stretching vSan cluster task is started from SDDC vCenter will be queried for configuration.

If Advanced Settings for HA are empty this behaviour will occur. 

Resolution

Recreate Advanced settings in vCenter HA tab 

Advanced Settings are located  under

Cluster > Configure >  vSphere Availability > Edit > Advanced Settings 

das.ignoreInsufficientHbDatastore     true

das.ignoreRedundantNetWarning      true

das.iostatsInterval                               0

das.isolationaddress0                         XXX.XXX.XXX.XXX  << vSan gateway 1 

das.respectVmVmAntiAffinityRules    true

das.usedefaultisolationaddress          false

das.isolationaddress1                         XXX.XXX.XXX.XXX   << vSan gateway 2