ex3300 performance during port mirroring

Hi,

We are looking at the possibility to use port mirroring on EX3300 switches to analyze the traffic passing through the device. The current idea is to do this mirroring permanently as a way to do real-time monitoring on the network traffic and conditions. A few questions come to mind:

• In a virtual chassis, does the traffic entering the virtual chassis on another switch than the one with the analyzer port get mirrored?
• Can we expect any performance degradation on the switches assuming that we only mirror a select number of VLANs?
• Is there anything else we should be wary about?

Thanks a lot to the community for any feedback.