I have to correct and clarify some points above - we do not believe that any SCOM Health Service - whether Agent, OR Management Server - will achieve more than 75000 workflows.
We do recommend a Management Server for the largest environments, but not because of workflow count. A Management Server is more stable, better architected for large discoveries, and it performs less local disk I/O than an Agent (Management Server talks more-or-less direct to SCOM databases)
But for the number of workflows, 75K seems to be a real-world limit. It is a soft limit, but we found that exceeding this leads to very long discovery times, and if anything changes in the environment (such as even one VM vMotion), then the SCOM Health Service has to recalculate all workflows. When >75K workflows, this recalculation just eats CPU, memory and disk I/O, and effectively causes a monitoring outage which can be an hour or even more. So we don't recommend exceeding 75K workflows, even on Management Server.
I believe in your environment, probably you are already close to 75K workflows on each Collector? The performance counter is available in our MP, in view Veeam for VMware/ Veeam Collectors / Performance / Collector Load %
. (this percentage is calculated as a % of the 75K recommendation). There are also views Total Veeam Workflows
and Workflow Count
in the same folder (these views show Veeam-only workflows, and the total workflows running in the Health Service).
I can say that MP v6, with it's redesigned topology, improved discoveries, and optimised rules and monitors (multiple events/metrics gathered by one workflow) is greatly more efficient than v5.7. If you use Management Servers, and MP v6, you should acheive the 75K limit; and this equates to approx 1000 VMs per Collector. This number varies depending on your exact topology - definitely recommend using the Deployment Calculator- http://www.veeam.com/support/mp_deployment.html
which will give a good estimate on number of Collectors required for your specific environment.
Hope that helps - any questions let us know!