" what is the recommended number... " ... Number of what? ... monitors? ... RC by BU? ...
How many RC, DB (Database Server) and AS (Application Server) did you already buy?
Greetings from Chile,
Hi Keithcog -
What you need to review is the RBAC within envision. This is very robust and meets your exact business requirement.
First: for the devices in the different regions - assign them an Attribute like Location = BU1
Second: You would need to assign the specific Devices into different Groups, then manage the Groups.
This is done under the Overview / Sys Configuration / Devices window.
When creating your BU1 and BU2 Groups - Be sure to enable the "Device Access filter for setting permissions".
Note, you can create a Dynamic group so that any device that gets created with a 'attribute tag' ex: Location=BU1 will automagicily get assigned to the appropriate group. Attributes are under the specific device you are collecting from.
Additionally, you can create Static groups and manage them directly - up to you.
Go to the USERS option, Here you create/manage users for envision. Under the Device Access Permissions, allow them to Only see the appropriate Device Groups you created earlier.
These Rights you assigned are transferable into EE
For workflow - when creating Alerts for your environment - you can add an Output Action to email the appropriate analyst and take out the middleman. Additionally, you can also schedule Reports to run by Device Group and email the results to the responsible party.
As for monitors - Big is good, but High Resolution is better! I would recommend at least 4 so you can have multiple EE & envision dashboards shown.