sorry if it might has been asked before but i have this case:
i have a TWO 7835 MCS servers and ONE 7816 MCS server CCM version is 6.1
I want to use 7816 server as publisher and i want to configure this publisher as datbase server only I WILL NOT activate callmanager service and WILL NOT activate tftp service on it (it's role only to maintain the database)
I'll add the other 7835 servers will be subscribers and tftp servers
my question is will cluster in this design work, can 7816 publisher in this case work without any performance issues?
Publisher actaully requires more horsepower, so I would not do it this way. If you monitor the systems you will see that cpu and memory utilization is always higher on Pub, if anything I would use the 7916 as my backup sub.
My recommendation stands, use the most powerful server for Pub. Pub is always involved in call processing, it's not just DB master, if your publisher's utilization goes up you will notice call setup delay etc, that's because the endpoints use the CMs' DB first to determine call routing, etc, only if it's unavailable they use sub replica.
Just to add a note to the great tips from Chris and Paul (+5 points each guys for your good work:)
You will need to be careful with this design as far as failover goes. The 7816 only supports 300-500 users depending on what doc you read. You will want to keep this in mind when designing your Callmanager Groups;
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