Veeam Proxy Max Concurrent Task

[desmond.lee]

Hi all, I set the "Max concurrent tasks" to 5 and there is no limit of the repository. However, when the backup job is running, there are only 3 tasks is running at the same time. May I ask why is that and what is the mechanism of the concurrent tasks of the Veeam Proxy? Thanks!

[Shestakov]

Hi,
Before processing a new task, VBR detects involved backup infrastructure components (backup proxies and repositories). When a new job starts, VBR analyzes the list of VMs that the job includes, and creates a separate task for each disk of every VM to be processed. Tasks in the job can be processed in parallel.

Task limiting is performed by the Veeam Backup Service that is aware of all backup proxies and backup repositories connected to it, and settings specified for these backup proxies and repositories. When a job starts, it informs the Veeam Backup service about its task list and polls the service about allocated resources to its tasks at a 10 second interval after that. Before a new task targeted at a specific backup proxy or repository starts, the Veeam Backup Service checks the current workload (the number of tasks currently working with the proxy or repository) and the number of allowed tasks per this component. If this number is exceeded, a new task will not start until one of the currently running tasks is finished.

Note, that each task requires a single CPU core. Does your proxy have at least 5 CPU cores? How many jobs are you running in parallel? Are there several VMs/disks?
Thanks.

[desmond.lee]

Hi Shestakov,
I used the default proxy on the host of VBR. The server has 6 cores. Only one job run at the time. Is it mean the task count one job only when trying to back up a single vmdk disk?

[Shestakov]

That`s the reason. Parallel processing implies that several VM disks can be processed concurrently. If you backup job includes a single VM with one disk, it will not be beneficial.
Thanks.

[desmond.lee]

So it mean if there are two vmdk disk are being backup in single VM, it counts as two tasks in Veeam backup?

[veremin]

1 task means 1 virtual disk. So, can you tell us how many VMs are present inside the job and how many virtual disks they have? Thanks.