Veeam Replication Concurrent Streams on proxies

[dpmarkham]

I have a customer who is using Veeam to migrate some VMs from one Vcenter environment to another. He has set up two virtual proxies, one on the source Vcenter and a second on the Destination Vcenter. Each Proxy VM has 24GB of RAM and 16 vCPU’s. He has set Max concurrent tasks to 20 on both proxies and has a green check mark on that. He set up a job with multiple VM’s with each VM having 2 disks. The job is only processing a max of 4 VM’s at at time. I am thinking it should be able to do at least 10 VM’s (10 x 2 disks = 20 concurrent tasks). Do VM replication jobs use more concurrent tasks than a single task per disk?

[david.domask]

Hi Dean,

By chance are all the VMs on the same datastore?

https://bp.veeam.com/vbr/3_Build_struct ... -snapshots

You might try testing the registry value here in small steps; by default there is a max of 4 snapshots allowed per datastore to prevent overloading the VMware environment during backups (imagine 100 machines with 100 simultaneous snapshots being created/merged).


Path: HKEY_LOCAL_MACHINE\SOFTWARE\Veeam\Veeam Backup and Replication
Key: MaxSnapshotsPerDatastore
Type: REG_DWORD
Default Value: 4

Try a value of 6, you should see that more machines are processing. How high you can set it is environmentally dependent, but raise it in small increments to find the sweet spot for this environment.

[dpmarkham]

Thanks David. This seemed to be the answer. He changed the registry entry to 6 and is now seeing 6 concurrent replication streams active at a time.