VEB / VAW Throttling Feature

[Fledge]

Hi,

Is there any info on how/what the backup agent checks on the host platform to determine if it is busy and hence throttle agent performance ?

On a box (still running VEB at the moment), normal backup (CBT) read performance from disk is in the range of say 100 - 200MB/s
But we have seen the read from disk performance plunge to into the KB/s range and backups take v.long time
However looking at the platform metrics cpu / mem / disk do not seem that heavily used
So trying to understand what could lead VEB to think the platform is under stress and throttle its disk read so heavily ?

Disabling the agent throttle feature gets us back to normal backup performance

thanks in advance

[Dima P.]

Hi Fledge.

When throttling enabled, Veeam Agent for Microsoft Windows sets low priority for it's components engaged in the backup process (in particular, the VeeamAgent.exe process). The resource distribution in this case is performed by Operating System.

[Fledge]

Hi - thanks for the confirmation Dmitry

Wasn't sure if VEB itself did anything or if it relied entirely on the OS

I did look at the Veeam process priorities when backup running and saw that they were all set at 'normal' (including the first instance of VeeamAgent.exe) but then the second instance of VeeamAgent.exe (which assume is the actual worker thread for the backup) was set to 'low'

Will turn attention to the OS and look deeper in that direction

Thanks

[Dima P.]

If you are running backup to local target, shared folder or OneDrive, indeed, you will see two agents - 'sender' and 'receiver'. Operating system should throttle the 'sender' agent according to the priority ('receiver' cannot get the data faster than its processed by 'sender' anyway). Cheers!