In our VMware environment, VM snapshot backup is keep failing or going into hung state after initiating the backup job on couple of virtual servers which has more than 24 disks.
We use Veritas Netbackup as a backup solution in our VMware infrastructure environment and we have couple of netbackup appliances.
There are two methods are enabled for the backups. One is NBD transport method and other one is SAN transport method. Please refer this link how does these backup transport methods work.
As per the Veritas support article, found below information on both backup transport methods –
The SAN transport mode requires the VMware Backup Host to reside on a physical machine with access to Fibre Channel or iSCSI SAN containing the virtual disks to be accessed. This is an efficient data path because no data needs to be transferred through the production ESX/ESXi host.
In this mode, vStorage APIs obtain information from the vCenter server or ESX / ESXi host about the layout of VMFS LUNs and, using this information, reads data directly from the SAN or iSCSI LUN where the VMDK resides.
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LAN (NBD): In this mode, the ESX/ESXi host reads data from storage and sends it across a network to the VMware Backup Host. As its name implies, this transport mode is not LAN‐free, unlike SAN transport.
VM backup job hangs when server has more than 24 disks:
However, logged a case with VMware vendor to determine the root cause of this “VM backup job hangs when server has more than 24 disks”.
VMware provided an article on this stating that, this is a known issue with the current version of vCenter 6.5 and this has been fixed or resolved in VMware vSphere Hypervisor (ESXi) 6.7 version.
vCenter 6.7 server is an appliance now comes with Photon operating system which has developed by VMware. And it has with vSphere Client (HTML5) web client version and there will be no flash version issues.
This VCSA (vCenter Server Appliance) has come with more different features when compared with previous versions.
To conclude that, if your VMware infrastructure environment on vCenter version 6.5 and below, VMware vendor advised to upgrade to VCSA 6.7 version to handle or resolve the VM backup job hang issues when virtual server has more than 24 disks.