Manage the rhevh without rhevm

I am a software developer of a system management software and plan to support the rhevh as the hypervisor of virtual machine, but I am a little worry about the performance of rhevm for a large cluster that with more than 1000 hypervisors and 10,000 of virtual machines. Then I am investigating that whether it's possible to control the rhevh through the libvirt or vdsm interface of rhevh without the rhevm.

I tried use the virsh to connect to the rhevh, but failed with following error message:
error: packet 1181314145 bytes received from server too large, want 262144
error: failed to connect to the hypervisor

And I'll try to use the xmlrpc interface of vdsm to control the hypervisor.

Could some experienced guys help me out that whether it's possible to use the libvirt or vdsm to manage the rhevh?