Define a Limit to the Quantity of Concurrent Backups

Creating Plans to Protect Data › How to Create a Host-Based Virtual Machine Backup Plan › Create a Host-Based Backup Plan › Define a Limit to the Quantity of Concurrent Backups

Define a Limit to the Quantity of Concurrent Backups

You can define a limit to the quantity of backup jobs that run concurrently. This capability lets you optimize the performance of the host-based VM backup proxy server in your backup environment. By default, Host-Based VM Backup can run up to four VMware VM backup jobs and ten Hyper-V VM backup jobs concurrently. In environments that contain many virtual machines that are associated with a proxy server, a high quantity of concurrent backups can have an adverse effect on network and backup performance.

Note: When the quantity of concurrent jobs exceeds the defined limit, the jobs that exceed the limit enter a job queue.

Note: If the maximum number of concurrent VMware backup jobs exceeds the ESX server connection limit, communication failure can occur between the ESX server and the backup proxy, and the file system of the ESX server data store can remain locked. In such cases, restart the ESX server or migrate the locked virtual machine to another data store to unlock the VM. For more details, refer to the VMware document (VMware KB:1022543).

Follow these steps:

Open Windows Registry Editor and browse to the following key:

HKEY_LOCAL_MACHINE\SOFTWARE\Arcserve\Unified Data Protection\Engine

Locate the following keys:
```
VMwareMaxJobNum
```
```
HyperVMaxJobNum
```
Note: Both the keys are already created and the default value is 4 and 10, respectively.
Right-click VMMaxJobNum or HyperVMaxJobNum and click Modify on the pop-up menu.
The Edit String dialog opens.
In the Value Data field, specify the quantity of backup jobs that you want to allow to run concurrently.
- Minimum limit--1
- Maximum limit--none.
- Default--10 for Hyper-V and 4 for VMware
Click OK.
The limit is defined.

The limit of concurrent backup jobs is defined.