What should be the server spec to support 500-1000 simultaneous users on jitsi? I will be supporting 720p / 360p for now with simcast disabled.
All depends on the size of the conferences. So 3 participants with simulcast disabled sending 720p which very roughly let’s say is 4Mbs. So the server for this conference will have download 3*4= 12Mbs and the upload will be (3-1)34=24Mbs. You can do the calculation but the upload is expanding depending on the nuumber of participants, so the numbers are not proportional.
Looking at the numbers you will understand why disabling simulcast is bad idea.