Learn how to provision tenants, synchronize on-premise Active Directory, implement Single Sign-On, customize Office deployment, and protect your organization with eDiscovery and DLP policies. Only from Platform Scholar.
Solved
Implementing DAG in two site configuration
Posted on 2010-11-11
OK so we currently have 2 active sites (A&B) with an Exchange 2010 SP1 server at each site, with users accessing both and are looking to implement DAG's. We also have a 3rd site (C) that is used for hosting our spam appliances and intranet servers. All sites are connected via a WAN, in the same AD domain and each site is in it's own AD Site.
My main concern with implementing DAG's in this configuration is what happens if I lose WAN connectivity?
I've read that SP1 now supports this type of configuration and helps prevent the potential 'split-brain' situation through the use of DAC (Datacenter Activation Coordination)
I have questions though.
Where should I place my primary FSW?
Should I configure an Alternate FileShareWitness server?
Example: Could I have Site A + FSW and Site B + AltFSW? What would happen if I lost WAN connectivity?
In the future we plan to implement a 4th site with an Exchange server.
My main concern with implementing DAG's in this configuration is what happens if I lose WAN connectivity?
I've read that SP1 now supports this type of configuration and helps prevent the potential 'split-brain' situation through the use of DAC (Datacenter Activation Coordination)
I have questions though.
Where should I place my primary FSW?
Should I configure an Alternate FileShareWitness server?
Example: Could I have Site A + FSW and Site B + AltFSW? What would happen if I lost WAN connectivity?
In the future we plan to implement a 4th site with an Exchange server.
[X]
Welcome to Experts Exchange
Add your voice to the tech community where 5M+ people just like you are talking about what matters.
- Help others & share knowledge
- Earn cash & points
- Learn & ask questions
4-
3
7 Comments
Active today
>> My main concern with implementing DAG's in this configuration is what happens if I lose WAN connectivity?
the site with no file share witness will go down due to loss of quorum
>> I've read that SP1 now supports this type of configuration and helps prevent the potential 'split-brain' situation through the use of DAC (Datacenter Activation Coordination)
it does but wan connectivity issues are still not supported
the site with no file share witness will go down due to loss of quorum
>> I've read that SP1 now supports this type of configuration and helps prevent the potential 'split-brain' situation through the use of DAC (Datacenter Activation Coordination)
it does but wan connectivity issues are still not supported
>> >> My main concern with implementing DAG's in this configuration is what happens if I lose WAN connectivity?
>>the site with no file share witness will go down due to loss of quorum
What would happen if I had an alternate file share witness at the other site?
>>the site with no file share witness will go down due to loss of quorum
What would happen if I had an alternate file share witness at the other site?
Active today
the concept of the alternate share witness is totally different, it is used only one you do a datacenter failover it is not for these scenarios
So if WAN connectivity is lost all the users at the site with no FSW will not be able to access email even thought they have a functioning email server in the same location as them? Seems kind of limited?
Active today
>> So if WAN connectivity is lost all the users at the site with no FSW will not be able to access email even thought they have a functioning email server in the same location as them?
exactly
>> Seems kind of limited?
DAG cross site was designed to be in a DR site as active/passive model and not as active/active. It could be better I know, hopefully exchange 2013 :)
exactly
>> Seems kind of limited?
DAG cross site was designed to be in a DR site as active/passive model and not as active/active. It could be better I know, hopefully exchange 2013 :)
Featured Post
Learn how to provision tenants, synchronize on-premise Active Directory, implement Single Sign-On, customize Office deployment, and protect your organization with eDiscovery and DLP policies. Only from Platform Scholar.
Question has a verified solution.
If you are experiencing a similar issue, please ask a related question
In-place Upgrading Dirsync to Azure AD Connect
After hours on line I found a solution which pointed to the inherited Active Directory permissions . You have to give/allow permissions to the "Exchange trusted subsystem" for the user in the Active Directory...
In this Micro Video tutorial you will learn the basics about Database Availability Groups and How to configure one using a live Exchange Server Environment.
The video tutorial explains the basics of the Exchange server Database Availability grou…
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…
Suggested Courses
Course of the Month10 days, 13 hours left to enroll
719 members asked questions and received personalized solutions in the past 7 days.
Join the community of 500,000 technology professionals and ask your questions.