VMs are experiencing connectivity issue during the backup operation in Veeam

Products

• VMware vSphere ESXi

Issue/Introduction

VMs are experiencing connectivity issue during the backup operation in Veeam backup software

Environment

Veeam backup software

Network Filesystem backed Datastores

VMware vSphere ESXi

Cause

Hot Add transport mode is used in NFS environments.   

Veeam's Backup proxies and transport modes: VMware backup best practices document indicate possible high stun times with this backup mode. 

 

 

 

The VMs will experience the issues as quoted in VMs take two minutes to power on after a High Availability/Fault Domain Manager failover when NFS v3 storage is used

The vmx logs will indicate high stun times as indicated below.

/vmfs/volumes/<Datastore_Name>/<VM_Home>/vmware.log

YYYY-MM-DDThh:mm:ss.zzz In(05) vcpu-0 xxxxxxxx-e-5f3b CPT: vm was stunned for 40020294 us
YYYY-MM-DDThh:mm:ss.zzz In(05) vcpu-0 xxxxxxx-d3-32ff CPT: vm was stunned for 40044242 us

 

Resolution

Consider switching to a different backup mode in an environment with NFS backed Datastores.