UVB Resources - Post processes or Jobs are taking too long to complete or get terminated


Post processes are taking too long, sometimes taking days to complete. This is a resource issue, which can not be detected using external tools.


Post processes are taking too long, sometimes taking days to complete.


If your Presentation Administrative Interface is displaying hung jobs, please perform the instructions in the KB Jobs are stuck on UVB (hung jobs) - Clear all hung jobs first before you proceed with the steps below.

Verify your UVB VBAs have the proper resources to handle the Role they have been assigned. Increase resource so that the following roles listed below, have the values indicated. If you your VBA has multiple roles, add the values.

Presentation User-added image

The Presentation appliance is the appliance running the web-based interface you use to configure and manage your installation. Only one presentation appliance is necessary per installation, across all configured environments. Managers and Engines assigned to a Presentation VBA should not be allowed to communicate with Managers and Engines of a different Presentation VBA. The actual management and configuration of the Unitrends Virtual Backup solution occurs through the Presentation appliance’s web interface.

Minimum 2 vCPU and 4GB of vRAM are required and the maximum is limited to what you can manage.

Management User-added image

Each environment requires one appliance designated as the Management Appliance. This appliance performs inventory and other hypervisor-specific tasks and manages the work of the Engine appliances. Each environment you add to your UVB deployment requires the IP address of one appliance to act as Management appliance. This becomes especially important when the site is separated by a WAN, as it minimizes WAN traffic, expedites the completion of Jobs, and reduces the risk of hung Jobs or database corruption due to communication failures. The Presentation Appliance can also be designated as a Management Appliance, but does not eliminate the need for more Management Appliances at the other environments.

Minimum 2 vCPU and 4GB of vRAM. If performance degrades and cannot be corrected with more CPU/RAM resources, consider segmenting the environment so you can deploy more managers, one per network segment.

Engine User-added image

The appliances that perform the actual backups processing and send data to their configured backup data stores are the Engine Appliances. Engines are be the most common role an appliance will take on in your deployment.

Each Engine should have 4 vCPU and between 4GB and 8GB of vRAM, and should not exceed the storage handling limits of the BDS (see Storage below). Engine performance does not improve above 8GB of RAM. Add more Engines if you see performance issue or if you need additional storage above the storage handling limits. For each Engine you add, consider adding 1 vCPU and 1GB of RAM to your Presentation and the associated Manager.


The BDS (Engine) Appliance Guidelines

  • VMware vSphere and Hyper‐V: One Engine appliance for each 10 TB of source data. If using CIFS storage, one Engine appliance per 5 TB of source data is recommended.
  • Citrix XenServer: One Engine appliance for each 1 TB of source data.
If you are going to use NFS or CIFS, only use Full with Incrementals (do not use Virtual Full). UVB uses hard links for referencing deduplicated blocks but NFS does not support hard links. You can check with your Storage vendor as it may be an option that must be enabled on some products. If it is supported, enabled the function before you begin backing up using the Virtual Full option.


Resource limitations cause post processing to take much longer to complete. The resource issue is related to the VBAs involved in the database updates for the Presentation/Management VBA as well as the processing of the data in between the Engine and Storage BDS (deduplication and retention). This kind of resource issue is difficult to detect or monitor using external tools.


​For increased performance, greater capabilities, and a future-proof solution, consider upgrading now to the Unitrends Enterprise Backup (UEB).

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