Comments on: Exchange Best Practices: Datacenter Activation Coordination Mode

By: Fırat Boyan

Fırat Boyan — Mon, 26 Sep 2022 18:21:53 +0000

Hello Paul,
What is the difference between
Set-DatabaseAvailabilityGroup EXCHDAG01 -DatacenterActivationMode DagOnly
and
Set-DatabaseAvailabilityGroup EXCHDAG01 -DatacenterActivationMode On

By: NELSON CORALES

NELSON CORALES — Fri, 23 Mar 2018 04:10:35 +0000

In reply to NELSON CORALES. Sorry, didn't display.... :-(

By: NELSON CORALES

NELSON CORALES — Fri, 23 Mar 2018 04:09:03 +0000

Yes, I didn’t displayed it’s full name. This is a Win2008 R2 server in our domain running some apps. It’s not part of the Exch 2013 environment.

By: Paul Cunningham

Paul Cunningham — Thu, 22 Mar 2018 23:19:59 +0000

In reply to NELSON CORALES. What is "mail", is that a server name in your org?

By: NELSON CORALES

NELSON CORALES — Thu, 22 Mar 2018 21:52:45 +0000

Paul, we were trying to setup our DAC..
“Set-DatabaseAvailabilityGroup -Identity EX-DAG01 -DatacenterActivationMode DagOnly”
and got this warning…
File share already exists, however directory is different from witness directory. Until this problem is corrected, the database availability group may have increased vulnerability to failures. To correct this problem, delete existing the file share and use the Set-DatabaseAvailabilityGroup cmdlet to retry the operation.
Our file witness is at “\\mail\dagfsw\” not an Exch. server.
Do we need to delete the contens of the dir above and re-run the cmdlet?
Is that what they mean?
Please let us know.
Thx.

NRC

By: Robert Y.

Robert Y. — Wed, 07 Feb 2018 16:36:35 +0000

In reply to Paul Cunningham. Thank you for the input.

By: Paul Cunningham

Paul Cunningham — Wed, 07 Feb 2018 06:44:33 +0000

In reply to Robert Y.. All change carries risk. Plan accordingly. Test if necessary. Understand what change you're making and how to roll it back if needed. Other than that, I consider it a safe change.

By: Robert Y.

Robert Y. — Wed, 07 Feb 2018 00:45:45 +0000

Would like to know if there is a chance for fallout to enabling DAC mode on a production system?

By: Paul Cunningham

Paul Cunningham — Tue, 28 Nov 2017 20:26:52 +0000

In reply to Kumar. Simplest option is just to have two separate MX records, one for each datacenter.

By: Kumar

Kumar — Tue, 28 Nov 2017 13:20:53 +0000

In reply to Paul Cunningham. Thanks Paul, just wanted to know, we are planing to implement GEO load balance for the same purpose and keeping witness server in third location also. see in this scenario how the mx record pointing will be configured. currently we have 2 records mail.xxxx.com(pointing to primary site exch.) and mail2.xxxx.com(pointing to DR site exch.) once we implement GEO do we need to keep same record or single name will do the job?. if you could tell me the required DNS records and public IP for this scenario that would be great.