Solved

DAG failover issues (again)

Posted on 2013-10-24
5
386 Views
Last Modified: 2013-11-09
Hi

Back to this one again, still unresolved after more testing. The issue is, if the databases failover to the DR exchange server for any reason, while the HQ server is still up, Outlook stops working.

To recap:

2 physical sites, each with a DC and configured as separate AD sites on different subnets.

Each site has a single Exchange 2010 server with ALL roles, and configured in a DAG.

HQ contains all users and the DR site is purely passive until such time as a failure.

Topology below:

HQ IP Range: 192.168.61.0/24
DR IP Range: 192.168.32.0/24

exch-hq - 192.168.61.40
exch-dr - 192.168.32.40

DAG Name: company-dag
DAG IP's: 192.168.61.45 & 192.168.32.45
Primary Witness: HQ Site
Alternate Witness: DR Site

Get-MailboxDatabase -Server exch-hq | fl name, rpc*

Name: DB01
RpcClientAccessServer: exch-hq.company.com

Name: DB02
RpcClientAccessServer: exch-hq.company.com

I think there a few misconfigurations in place here, from things I have read about.

Having dedicated CAS Array servers with NLB etc is NOT possible, so we are going down the DNS route which I know can work.

1. RpcClientAccessServer setting
2. DAC Mode
3. DatabaseCopyAutoActivationPolicy - does this need to be set?
4. How do you test permissions for Witness servers to be 100% they are working?
5. AllowCrossSiteRpcClientAccess - does this need to be set?

I'm thinking I should create a cas.company.com DNS entry with a low TTL, point it at exch-hq (192.168.61.40).

Then change the RpcClientAccessServer property to cas.company.com, manually changing the IP in DNS when failover occurs

But the other commands (and any I missed) - do these needs to be set?

Have I missed anything?
0
Comment
Question by:bikerhong
  • 3
5 Comments
 
LVL 24

Expert Comment

by:-MAS
ID: 39596739
Please make sure your witness server is configured properly.
Try recreating the witness folder in DAG properties
Check this
0
 
LVL 9

Expert Comment

by:Mahesh Sharma
ID: 39596792
0
 

Author Comment

by:bikerhong
ID: 39597164
Ok, I think I have this working to a satisfactory point.

I created a cas array object (which exists only in DNS)
I created a cas dns object with a TTL of 5 mins pointing to exch-hq
I assigned this cas object to a test database

Testing:

Test DB mounted on Exch-HQ with client at HQ, with Outlook profile reconfigured to look at cas dns record.

All OK.

Failed test db over to DR, Outlook comes up and says it needs to be restarted.

Restart Outlook, all OK.

Failed back, same thing happens.

This is "acceptable", I dont think we can get failover working seamlessly without some actual CAS servers?

If there is anything else to add to this please do so, we are still testing, if no replies in a few days I will select the most appropriate best answser.
0
 

Accepted Solution

by:
bikerhong earned 0 total points
ID: 39597379
Update - setting AllowCrossSiteRpcClientAccess property allows outlook to failover without prompting for restart!
0
 

Author Closing Comment

by:bikerhong
ID: 39635420
Best answer
0

Featured Post

Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Following basic email etiquette rules will help you write a professional email and achieve a good, lasting impression with your contacts.
Are you unable to connect or configure Hotmail email account in Microsoft Outlook 2010, 2007? Or Outlook.com emails are not downloading to Outlook? Lets’ see the problem and resolve Outlook Connector error syncing folder hierarchy (0x8004102A).
In this video we show how to create an email address policy in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.:  First we need to log into the Exchange Admin Center. Navigate to the Mail Flow…
The basic steps you have just learned will be implemented in this video. The basic steps are shown to configure an Exchange DAG in a live working Exchange Server Environment and manage the same (Exchange Server 2010 Software is used in a Windows Ser…

919 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

21 Experts available now in Live!

Get 1:1 Help Now