800xA Domain Server Configuration Multiple Network Cards
Why we need netowrk and RNRP software running onDCs.
Installing Dual Homed DC can create enormous issues as per below blog.
What make it differet for ABB 800XA System is always with Dual Network and RNRP.
What is the adavantage we get ?
First, I'm aware of the criticism to having more than one NIC in a DC.
However, I've personally not yet witnessed any major issues stemming from a multihomed DC in System 800xA.
A DC with a single NIC will work with System 800xA, but only on the network it is connected to. If that network becomes unavailable (a number of reasons exist) domain authentication may break down and with it System 800xA's authentication mechanism will cease to work (since it uses Microsoft Domain authentication) and the system may start to malfunction because some client can no longer connect a server, or a server cannot connect a redundant peer server for exchange of data, e.g. service synchronization.
Reasons for a network to go down:
- NIC malfunction in DC
- NIC malfunction in member computer
- Switch malfunction
- Cable or fiber failure
- Power supply failure
- Configuration error
- Network loop or storm. Such will be detected by RNRP and redundant connected computers may shut down affected NIC for the duration of 1 hour.
If you need to supply a solution with redundant client server network, but prefer single homed DCs you can use an ABB NE870 or NE871 RNRP router to interface the domain controller. The NE871 has three ports while the NE870 has 11 ports. There is still a risk that that the DC's single NIC fails or a network loop/storm causes RNRP in the DC to block the only NIC it has - however, with a single connection the blockage will be 10 seconds and repeated until the loop/storm has ceased.
I suggest bringing your doubts to ABB BU CT product management. Ask your regional ABB sales representative to setup a meeting.