Hi everybody
As i known there are many tools and websites support for calculating disk space, bandwidth, lens, etc... but for CPU and RAM there are not much. Maybe on VMEs Provider websites they isuse some guidelines or recommendations for their software. So are there anyway or a formula to calculate CPU and RAM.
Thank you
Its really going to depend on what VMS you are using, and how it operates. For example the way that motion detection is processed if your using Server Side or Camera Side VMD, that will step your CPU requirements way up. The number of users, the number of streams each user is watching, there are so many variables that its almost impossible. But generally the manufacturers are going to give you some sort of estimate or recommendations based on their average use, then you take good judgment and common sense and base your system around that. Manufacturers like ONSSI will actually help you spec out the server or give your specs based on your needs, Exacq its really hard to under build one these days because its not resource intensive.
But as for calculators I have not seen anything and having the VMS manufacturer onboard and assisting is the best solution if your not sure.
Like Undisclosed 1 says, it really depends on the VMS. It can't be simplified to a certain number of cameras needing a certain processor/RAM combo.
Moreover, you want the manufacturer to fully support the system, so asking and following their recommendations is important. If you don't follow them, they could simply come back to you should issues arise and tell you the server was under specified.
All that being said, I can sum up some recommendations from our VMS Server Load Fundamentals:
Ethan is spot on, but there is one item that we frequently overlooked early on. If you will have mobile clients viewing video please be aware this is frequently done through transcoding which can prompt a very high processor load. We have servers that record 90 or so cameras at resolutions of 1080p to 5 MP at 6-8 FPS using only 30% of the processors. As soon as two people hop on with mobile clients pulling 8 high resolution streams each that quickly jumps to 80% or more.
As everyone has stated in this thread the performance greatly varies depending upon the VMS.
2, that's a good point. Some systems, because of that, recommend running the mobile server / transcoder on another machine.
At some point, hopefully, VMSes will be able to send H.264 straight to web / mobile client without plugins.
Thank you all for your ideas.
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