[cisco-voip] CUCM Capacity and Maximum Supported Endpoints

[Peter Slow]

Wes,
   I'm not sure I understand how CSCsc71873 is a bug versus CUCM working as
designed.
   While I do know that I need to talk to the megacluster team before making
changes, I was looking for further information so as to formulate an opinion
of my own before doing so =)

-Pete

On Tue, Oct 25, 2011 at 3:31 PM, Wes Sisk <wsisk at cisco.com> wrote:

> Reading between the lines it sounds like your question is, "Is this
> enforced?".  I would respond with:
> CSCsc71873    NumDevRegExceeded- Number of registered devices
> exceeded:Phones cant REG
>
> It is not just a number stored in a database. It is enforced by the ccm
> process.
>
> Beyond that you said the keyword *megacluster*.  Those deployments get
> specific instructions for deloyments.
>
> AFAIK the sizing tools are not currently optimized for megacluster
> deployments:
> http://www.cisco.com/cgi-bin/CT/PGWCT/ct.cgi
>
> Your Cisco account still needs to submit megacluster designs to a special
> process for performance modeling and subsequent approval.  I believe this is
> the most appropriate answer to your question.
>
> Regards,
> Wes
>
> On Oct 25, 2011, at 2:20 PM, Peter Slow wrote:
>
> Hello Boys and Girls,
>    I have a question regarding CUCM Capacity. The SRND states that at this
> time with CUCM 8.x, there is a "Maximum of 40,000 configured and registered
> Skinny Client Control Protocol (SCCP) or Session Initiation Protocol (SIP)
> IP phones or SCCP video endpoints per cluster." ...Elaboration on this would
> be helpful.
> * Is the 40K limit on the number of devices configurable in the database,
> _or_ can we keep adding devices up to a particular point as long as we don't
> exceed 40K simultaneous registered phone devices?
> * What happens if we get to that limit? would CUCM cease to allow new
> phones to register, or would it stop me with an actual imposed limit of 40K
> configured phone devices in my database?
> * My ultimate goal is to figure out if I should keep growing my
> megacluster, or if I need to start making plans to turn up a new one.
>
> Background Info:
> I am running 8.6.1.21011-1. I have 12 subscribers doing call processing,
> each of which was built with the 7500 user VMWare OVF template. I am
> licensed for more. (VMware Installation: 2 vCPU Intel(R) Xeon(R) CPU E5640 @
> 2.67GHz etc...)
> I'm at slightly over 16K _registered_ devices today and we have one-to-one
> redundancy. For each subscriber I've got processing calls, I have one that
> is almost 100% idle. I have little to no CTI Controlled devices on this
> cluster.
> My current constraining factor is SAN disk space, so i'd like to save as
> much of that as possible. I have plenty of free UCS processing power and
> RAM.
> I have 4 other similar clusters, all of which need to be able to call each
> other. New clusters mean a scarer dialing plan but that can be managed.
>
> -Peter Slow
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