The Intelli-Site Redundancy feature is 2 features in one. The Engine Service and Driver Service are separately redundant, each having a counter part that can take over in the event of a failure. With that in mind it is possible for one server to be the Master Engine Service and another server to be the Master Driver service. It
should be noted that while there is a priority given to one server over
another, the computer highest in the list will most likely become master,
fail-over from one machine to another will not occur unless a failure occurs.
This mean that if the secondary machine is master when the primary machine is
brought up, it will remain the master and will not fail back to the other
machine.
Procedure
Redundancy
can be configured in many ways but for the sake of simplicity the following covers
the most basic configuration and assumes that there are 2 servers, and both
will be responsible for all panels. It also assumes that each server has its
own local copy of the database and is using PostgreSQL as the database server.
If a more advanced configuration is required, contact Technical Support for
assistance.
Steps to Resolve this issue:
Install Software and Licenses
Run installer and follow prompts on screen.
Wait for reboot and initial project dialog then follow prompts.
When project creation dialog comes up, name the project.
Start engine service but not driver service.
Launch Desktop Client and login.
From the menu choose the about dialog and go to license tab.
Enter and activate the License and SMA number.
Exit desktop Client and stop engine service.
Repeat these steps for each machine in the redundant setup ensuring the project name is identical on each machine.
Configure Postgresql for Redundancy
PGAdmin
III is installed with Postgresql when the Intelli-Site engine service is
selected in the installer. From the Start Menu, locate the [Postgresql 9.4] application
group and launch [pgAdmin III].
Click
the [PostgreSQL 9.4 (localhost:5432)] item in the tree on the left.
Open
the [Tools] menu and click [Connect].
Enter
the password, “postgres” in the Connect to Server dialog and click [OK].
From
the [Tools] menu select [Server Configuration] then [pg_hba.conf].
Double
click the blank checkbox at the bottom of the list.
In
the [Client Access Configuration] dialog, check the [Enabled] checkbox.
Change
the [Type] drop down to “Host".
Change
the [Database] drop down to “All".
Change
the [User] drop down to “All".
Enter
the IP Address of the other server followed by “/32” in the [IP Address] text
box.
Change
the [Method] drop down to “md5".
Click
the [OK] button.
Open
the [File] menu click [Save].
Open
the [File] menu again click [Reload Server].
Click
[Yes] on the [Reload Server Configuration] dialog.
Close
the window and pgAdmin III.
Repeat
on each server, specifying the other machines IP Address.
Configure Project for Redundancy. (It
is recommended that these steps be completed after most of the project
programming is completed and functionality is verified.)
Choose
one machine to start with. This will be the project that all other machines
sync to.
Add
a virtual panel to system layout with 2 points for each server.
In Design
View add a computer node for each machine in the redundant setup. The
machine you are using will already exist in the Computers nodes list.
Each
machine must be named the exact DNS name of that machine not including domain
prefixes or suffixes.
In
the Properties dialog of all machines check the box for Redundancy Enabled and assign a unique
virtual point for Online/Offline Point and Is Master Point.
Drag
the virtual points out to a screen so you will know the status of each server.
Stop
and Start engine service.
Configure Desktop Client for Redundancy
Launch
Desktop Client.
In
the login window click the gear icon.
Enter
the names of all servers in the host field separated by a comma with no
additional spaces.
Repeat
these steps on every Client.
Start Engine Service
On
the primary machine, start Engine Service.
After
90 seconds the machine will become Master, log into Desktop Client.
Note
the state of the virtual points. The Online/Offline point and Is Master point for this
server should be high.
Start Engine Service on the second server. It will sync with the master server and set its Online/Offline point high.
Configure Drivers for redundancy
In
Hardware Management View, right click on a driver and choose Driver Properties.
Click
in the Computer List and add the other servers.
Repeat
this for each driver.
You
may now start Driver Service.
Warning
<Enter important information regarding possible issue this might cause>
