The collector capacity is based on the brick size. The data source that you can add to a collector is depended on the capacity of the collector (VMs and flows).

For more information, see Collector Deployment - Maximum Capacity. After a collector is of LARGE brick size, you have to add more collectors. You can scale up each collector to Extra-Large size. You can add multiple data sources to a collector based on the supported collector capacity. However, you cannot add same data source to multiple collectors.

Scaling up Scenarios for the Collectors

Scenarios Action to perform
2000 VMs in a vCenter Install one medium collector VM. Add the vCenter to this collector.
1000 VMs in vCenter1 and 2000 VMs in vCenter2 (all of them are in one data center)

Install one medium collector VM. Add both vCenters to this collector.

1000 VMs in vCenter1 (data center1) and 2000 VMs in vCenter2 (data center2)

Install one medium collector VM in each data center. Add vCenter1 to a collector VM in same data center and Add vCenter2 to a collector VM in its data center.

VM count exceeds 4000, active flows exceeds 2.5 Million. Convert your collector VM from MEDIUM to LARGE. See Increase the Brick Size of Your Setup.
9,000 VMs in vCenter1 without flows (data center1). Install one large collector VM. Add this vCenter to the collector.
VM count is less than or equal to 10000, but the active flow exceeds 5 million. Convert your collector VM from LARGE to EXTRA-LARGE. See Increase the Brick Size of Your Setup.
Two vCenters, vCenter1 has 10000 VMs and 9 million active flows, and vCenter2 has 10000 VMs and 4 million active flows.

Install one EXTRA-LARGE and one LARGE collcctor. Add vCenter1 to EXTRA-LARGE collector and add vCenter2 to LARGE collector.

One vCenter that runs 10000 VMs and 9 million active flows. Install one EXTRA-LARGE collector and add the vCenter to the collector.
For information about adding vCenter server, see the user guide