Comments on: Database Availability Group (DAG) -Exchange 2010

By: Exchange Genie

Exchange Genie — Thu, 02 Feb 2012 00:44:40 +0000

To have different networks you need different network segments so you cannot have both IP as 192.x.x.x as this is a function of WFC

By: Anthony

Anthony — Wed, 01 Feb 2012 15:48:59 +0000

i have 2 mailbox servers on 2 sites. I have dedicated a nic for the DAG, but their ip adresses are in the same network as the mapi network.
i can’t manage to build the dag on those 2 nics.
For instance on one server: 2 nics (192.168.0.10 and 192.168.0.13) and i want to build the dag on the second one.

Thanks for your help

By: Exchange Genie

Exchange Genie — Wed, 18 Jan 2012 02:02:57 +0000

See the previous response…

By: Exchange Genie

Exchange Genie — Wed, 18 Jan 2012 02:01:43 +0000

Jaspal,
Let me restated just to me sure I understand the envirionment. You have a two node hyper-v cluster and would like to create an Exchange 2010 DAG by using 2 VMs hosted on the hyper-v boxes? The support stance for DAGs and VMs has been updated to be supported on Hyper-V. The way you can present FC storage to a hyper-v guest is by using a pass through disk or just use the storage as a CSV volume that you located the Exchange VHD. Exchange only using the cluster for heart beat, quorum, and a few dll’s so you do not have any issue creating a DAG with VMs.

YOu can reference this article http://technet.microsoft.com/en-us/library/cc794548(EXCHG.80).aspx

By: Jaspal

Jaspal — Tue, 17 Jan 2012 08:45:02 +0000

sorry for posting again as i was not clear above

Hi i have a doubt on Exchange 2010 Dag with hyper-v VM environment, i have following configuration

1)I have two host servers(2k8r2) and with VM’s(both 2K8R2)on each host in FC san environment.

I want to install DAG b/w these Two VM’s but i guess that is not supported configuration because as
dag still require few cluster services and also

a)As i looked in tech.microsoft that only hardware vitualisation is supported b/w the host machines for 2k10 dag configuration.
b)also With FC luns its not possible to form a cluster b/w hyper-v VMS

So if i go with hardware virtulisation i.e b/w host and install appliction(2k10 DAG) on Hyper-v VM’s and do VM migration will that be
a possible as cluster will only be b/w host machines and not VM’s and 2K10 DAG require cluster.

By: Jaspal

Jaspal — Tue, 17 Jan 2012 08:35:55 +0000

Hi i have a doubt on Exchange 2010 Dag with hyper-v VM environment, i have following configuration
1)I have two host servers(2k8r2) and with VM’s(both 2K8R2)on each host IN fC san environment.
2)I want to install DAG b/w these Two VM’s but i guess that is not supported configuration because
a)as i looked in tech.microsoft that only hardware vitualisation is supported b/w the host machines for 2k10 dag configuration.
b)also With FC luns its not possible to form a cluster b/w hyper-v VMS
but my question is as dag still require few cluster services how am going to do this configuration as cluster will only be b/w host machines and not VMS

By: Exchange Genie

Exchange Genie — Fri, 13 Jan 2012 18:33:40 +0000

Don’t pre-install the cluster service. It will cause this sometimes. You’ll end up having to wrangle the permissions manually, and that’s a bit of a pig.

In this case, make sure there’s not something weird with the nodes, and since we’ve created a cluster, we’ve staged a CNO already, so make sure that the CNO’s ACL gives full control to the ETS group.

Article… Here: http://technet.microsoft.com/en-us/library/ff367878.aspx

DNS resolution and having the nodes/CNO/DAG in wacky OUs with bad ACLs or inheritance disabled will do something real similar.

By: Dimitrij

Dimitrij — Fri, 13 Jan 2012 16:12:29 +0000

Genie,
You are right.
I don´t have DAG name in DNS. At least not in domain.

Can I create it manually, or it have to be created only from ExchangeServer?
When it have to be created? When ExchangeServer Creates a new DAG, or when I add a first MailServer to it?
Creating DAG comes without any errors.

Thanks

By: Exchange Genie

Exchange Genie — Fri, 13 Jan 2012 02:33:49 +0000

Dimitri,

Can you validate you can lookup the DAG name in DNS as I see its erroring out..
2012-01-12T13:40:20] DumpClusterTopology: Opening remote cluster pl-DAG.
[2012-01-12T13:40:20] DumpClusterTopology: Failed opening with Microsoft.Exchange.Cluster.Replay.AmGetFqdnFailedNotFoundException: An Active Manager operation failed with a transient error. Please retry the operation. Error: The fully qualified domain name for node ‘pl-DAG’ could not be found.

By: Dimitrij

Dimitrij — Thu, 12 Jan 2012 14:54:01 +0000

Hei Genie,
thanks for this post.

Can you please help by next problem?

I am trying now to make DAG with 2 Exchange servers.
So I´ve installed Exchange Server 2010 on 2 Window Server´s 2008 R2 Enterprice(both have CAS,HTS).
Than added DAG throw EMC and added both mailServers to “Exchange Trusted Subsystem” group.
Now I try add MailServer to DAG, and have this error:

Microsoft.Exchange.Cluster.Replay.DagTaskComputerAccountCouldNotBeValidatedException: A server-side database availability group administrative operation failed. Error: Computer account ‘pl-DAG’ couldn’t be validated by user ‘NT AUTHORITY\SYSTEM’.

Windows failover is installed and I can normal make a cluster for both mailServers.
Do you have any ideas what can I do bring this to work?
Thanks

Log:
User context = ‘NT AUTHORITY\SYSTEM’.
[2012-01-12T13:40:17] Member of group ‘Everyone’.
[2012-01-12T13:40:17] Member of group ‘BUILTIN\Users’.
[2012-01-12T13:40:17] Member of group ‘NT AUTHORITY\SERVICE’.
[2012-01-12T13:40:17] Member of group ‘CONSOLE LOGON’.
[2012-01-12T13:40:17] Member of group ‘NT AUTHORITY\Authenticated Users’.
[2012-01-12T13:40:17] Member of group ‘NT AUTHORITY\This Organization’.
[2012-01-12T13:40:17] Member of group ‘BUILTIN\IIS_IUSRS’.
[2012-01-12T13:40:17] Member of group ‘LOCAL’.
[2012-01-12T13:40:17] Member of group ‘IIS APPPOOL\MSExchangePowerShellAppPool’.
[2012-01-12T13:40:17] Member of group ‘BUILTIN\Administrators’.
[2012-01-12T13:40:17] Updated Progress ‘Validating the parameters.’ 2%.
[2012-01-12T13:40:17] Working
[2012-01-12T13:40:17] Mailbox server: value passed in = GA-EXCHANGE-01, mailboxServer.Name = GA-EXCHANGE-01, mailboxServer.Fqdn = ga-exchange-01.prologit.local
[2012-01-12T13:40:17] LogClussvcState: clussvc is Stopped on ga-exchange-01.prologit.local. Exception (if any) = none
[2012-01-12T13:40:17] The IP addresses for the DAG are (blank means DHCP):
[2012-01-12T13:40:17] Looking up IP addresses for pl-DAG.
[2012-01-12T13:40:20] Failure while trying to resolve pl-DAG: threw a SocketException: The requested name is valid, but no data of the requested type was found.
[2012-01-12T13:40:20] Looking up IP addresses for ga-exchange-01.
[2012-01-12T13:40:20] ga-exchange-01 = [ ::1, 192.168.7.6 ].
[2012-01-12T13:40:20] Looking up IP addresses for ga-exchange-01.prologit.local.
[2012-01-12T13:40:20] ga-exchange-01.prologit.local = [ ::1, 192.168.7.6 ].
[2012-01-12T13:40:20] DAG pl-DAG has 0 servers:
[2012-01-12T13:40:20] Updated Progress ‘Checking if Mailbox server ‘GA-EXCHANGE-01′ is in a database availability group.’ 4%.
[2012-01-12T13:40:20] Working
[2012-01-12T13:40:20] GetRemoteCluster() for the mailbox server failed with exception = An Active Manager operation failed. Error: An error occurred while attempting a cluster operation. Error: Cluster API ‘”OpenCluster(ga-exchange-01.prologit.local) failed with 0x6d9. Error: There are no more endpoints available from the endpoint mapper”‘ failed… This is OK.
[2012-01-12T13:40:20] Ignoring previous error, as it is acceptable if the cluster does not exist yet.
[2012-01-12T13:40:20] DumpClusterTopology: Opening remote cluster pl-DAG.
[2012-01-12T13:40:20] DumpClusterTopology: Failed opening with Microsoft.Exchange.Cluster.Replay.AmGetFqdnFailedNotFoundException: An Active Manager operation failed with a transient error. Please retry the operation. Error: The fully qualified domain name for node ‘pl-DAG’ could not be found.
at Microsoft.Ex