Does anyone have a high level ServiceNow Cloud Architecture diagram?

[cwooten]

I am looking for a high level ServiceNow Cloud Architecture to include in a Configuration Baseline Document.  

[Brian Bush]

"High Level" can be interpreted a lot of ways. I can tell you how to find some useful information to make your own diagram. Since you are in the US, I assume you are using the mirrored pair of data centers in San Jose, CA and Culpepper, VA.

You will have a database server in each data center that is being actively mirrored (synchronized in near real time). You will also have an equal number of application nodes running in each data center. These don't require mirroring, because they only contain the application code. While the setup is effectively active/passive, ServiceNow tends to refer to it more like Active/Standby. In any case, your DNS name is pointed to one data center or the other. An AHA fails over to the other with a DNS swing.

To get a lot of information about the application nodes, you can go to the "Diagnostics Page" in your instance. You'll see info about each node. Note the DNS names will contain sjc (San Jose) or iad (Culpepper). It also shows that the standard memory allocation is 2GB per node. I forget what the CPUs are rated. The bottom of this page will also show you the version of MySQL you are running on.

A trick to find what data center you are currently in is to look at stats.do. This will show the current node you are running on and you can just look for whether it has sjc or iad in the name. Scroll to the Database Connection Pools section and you will see the database you are currently running on <instance_name>_1 or <instance_name>_2. Now you can infer the name of the database server in each data center.

The only other potentially relevant information I can give you is that ServiceNow uses BigIP load balancers to get to your application nodes.