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Exchange Email Flow Stopping on DAG Failover

March 19, 2014, 1:28 am
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Hello everyone,

I have a 4 server Exchange setup configured as follows:

2 x Client Access (DNS Load Balancing Configured)
2 x Mailbox Servers (Both are DAG Members of the same group - Configured with only one Network card - There is no secondary network between the members)

Problem:
When DAG1,which is were all databases are mounted, goes down we lose all sorts of functionality in terms of OWA, ECP, Exchange Admin Center.
What is even more strange is that the databases successfully mount on DAG2 with a status ofHealthy.
In addition, users running outlook successfully continue to be connected to exchange but no email flow occurseven between internal users.

I have tried running all health checking commands such as Test-ReplicationHealth but everything seems to be clean.

Is there anything I am missing?

Thank you,

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Reseed with one copy exchange 2013??

June 30, 2013, 7:57 pm
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I want to reseed an exchange database as the Content index state is FailedAndSuspended, as searches in OWA are not available.

So I run: Update-MailboxDatabaseCopy "Mailbox Database 1434301284" -CatalogOnly

But then I get the error: This task is supported only for databases that have more than one copy.

How can I fix this issue?

Thanks,
Kris


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Exchange 2013 Site Resilient for CAS

March 20, 2014, 10:19 pm
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Hi All,

I am designing an Exchange 2013 Site Resilient Scenario with two Multi Role Exchange Servers per Site.
This is a small organization, single forest, single domain (All Windows 2012 R2).
There are three Sites.

The first site is the primary datacenter without users only one Exchange 2013 server multirole (CAS/MB).

The second site is the secondary datacenter without users and intended only for DR purpose (One exchange 2013 server multirole).


There is a third site where there are the users and where I'm planning to put the Witness Server (not Exchange server).

All sites are connected via MPLS. All users, in normal conditions, must connect only to the primary Datacenter.


My goal is to have a datacenter site Resiliency.

I have thought to use DAG for database replication, Single Global Namespace and an external GEO DNS/GSLB for internet requests/queries (DNS, SMTP IN, HTTPS).
In normal condition GSLB return only the pubblic IP for the primary DC. When the primary DC is unreachable the GSLB redirect to second DC.

Internaly I don't have load balancer or Global Server Load Balance.

I guess that internal Windows DNS and the stretched DAG in Exchange 2013 will do the magic and it'll keep connected users even when the primary datacenter is down (21 seconds for client reconnection).

(Maybe manual DNS changes would be necessary after the crash to avoid sporadic connectivity loss).

My question/concern is about the internal DNS;

We suppose I add two new internal "A" records like mail.example.com with the IP addresses of CAS server in primary and secondary datacenter.
Thus when the clients made a query to internal DNS, this respond with two IPs. In this scenario, in normal condition, some clients can go to primary CAS and others to secondary CAS.
I want that the internal clients go to the second DC only if the primary CAS is unreachable.
 
Is this possible? How does Round Robin feature interfere? Can I reach my goal or I must add the second CAS IP in DNS only when a disaster occurred?


Thanks in advance for your help.

Simone

Simone

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DAG Failback?

March 21, 2014, 9:47 pm
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I have two servers A and B with one mailbox database configured to use DAG. After an electrical power failure the database failover to server B.  How can I failback to server A when the server is back on? Is automatic or manually? What is the process to do it?

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Witness in failed state

February 27, 2014, 10:38 am
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More often than not, when I try to start dag maintenance, I get this message

WARNING: Database availability group ‘dag-mydag’ witness is in a failed state. The database availability group requires the witness server to maintain quorum. Please use the Set-DatabaseAvailabilityGroup cmdlet to re-create the witness server and directory.

My witness server is one of my Hub Transport servers. If I go to the GUI, and I just retype the witness server name, and then run StartDagMaint again....I do not get the error.

Why does this keep happening and how do I correct permanently?

Also, last night, my database failed over, and in event viewer, it says the it lost quorum.....the hub transport server is always up, and I never have problems connecting to it.

I'm running Exchange 2010 SP3 Rollup 4, on Windows Server 2012.

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Databasecopies fails due to false free logspace error

March 22, 2014, 2:15 pm
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I've created a 2 node DAG with 2 active databases. The dag was up and running for a day and then the database copies failed. They had a state of 'disconnectedandresynchronising'. Looking further in the eventlog, there were events reported that the replication manager couldn't contact the remote server within 5 seconds and the connection was forcefully closed. 

Then I came across the following event:

Database 'Mailbox_Database_1' is low on log volume space. 'Mailbox_Database_1' is low on log volume space. Current=130,11 GB, Threshold=195,31 GB

This is very weird, since both logdrives are almost empty. Also, total drive size on the log drives isn't the size as mentioned in the threshold, it's 135GB.

Deleting the database copy and recreating and reseeding it still fails with the same error. 

get-serverhealth returned unhealty for 'lowlogvolumespace', I guessed this was causing the replication to fail. Exchange thinks the drives are full and denies syncrhonisation.

Then I re-started the HealManager service on both nodes and voila, I was able to reseed the databases again.

Any idea what was going on here?

Frank.

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CAS Arrays and Mailbox Servers

March 10, 2014, 3:46 pm
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I am currently in the process of upgrading from 2010 to 2013, but it is on hold while we try to eliminate Outlook 2003.

I am new to the environment so I am doing my own health check.  Here is something I have come across:

on MB01 (Exch2010), I run get-clientaccessarray | fl and I get the following:

Name:  CAS_Array 

Members:  CAS01 (2010), CAS02 (2010), CAS03 (2010), MB01 (2013), MB02 (2013), MB03 (2013), MB04 (2013)

on MB01 (Exch2013), I run the same and I get:

Name:  CAS_Array

Members:  CAS01 (2010), CAS02 (2010), CAS03 (2010)

*note:  It doesn't list the version.  I am just including for reference.

As I understand, the CAS array shouldn't include any mailbox servers.  Is this correct?  I assume yes.  

The next question would be why does the 2010 database server see all of them, but the 2013 doesn't.  I have no clue.

How/Would I need to remove the 2013 database servers from the CAS array?

I am in a VMWare environment and I started to investigate the problem because I saw high CPU utilization on the 2013 mailbox servers throughout the day that coincides with users reporting slow exchange performance and getting the "spinning wheel" quite often.  Could this be related to the CAS_Array value?  We are doing hardware load balancing with Citrix Netscalers as well.

All thoughts are welcome.  Thanks!

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Exchange Server 2013 backup and restoration question

February 7, 2014, 8:20 am
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Good afternoon

I am wondering if I can pick people's brains here if that's not too much trouble.

I have recently implemented an Exchange 2013 environment with 3 servers (two multi-role CAS & MBX physical machines, and one further virtual CAS server). Everything is working correctly and mail-flow is fine. My question relates to backup and restoration procedures. I am running a single Database Availability group with the two multi-role servers members of the this group and I have one Mailbox Database on the DAG, passive on one member and active on the other. Failover has been tested and this is functioning as expected.

The backup environment I have implemented is as follows. I have utilized a separate Microsoft DPM 2012 server that runs a nightly Bare Metal backup on both multi-role servers with a retention range of 14 days and I have protected the DAG using DPM with a nightly full-express backup and 4 hourly syncs on one of the multi-role servers. Furthermore the Mailbox Database is protected, again nightly with a copy-backup.

I am confident I know what to do should the mailbox database become corrupted or lost or need to be restored for one reason or another (it would just be a case of restoring the backed up mailbox database using DPM to a pre-created recovery database), what I am not quite so sure on is what I would do should I lose one or both of the multi-role CAS and MBX servers (the third CAS I am not so worried about as it is not used for incoming mail flow from the internet and we really only use it for ECP as we did not want to expose this to the internet). I wonder what process should follow to restore my Exchange servers (I know how to perform the Bare Metal recoveries using WSB) and what configuration would be required after restoring the Bare Metal backups.

I know this is a reasonably long question but if anyone has any advice for me I would appreciate it greatly in the unlikely event something goes horribly wrong with my Exchange environment.

Thanks in advance

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Exchange 2013 distaster recovery

March 24, 2014, 8:28 am
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Good afternoon all

If I have lost all my Exchange 2013 servers (I have 3), can I still recover them all from Active Directory using the /m:RecoverServer switch? I have one CAS only server and two CAS/MBX servers, hosting a single DAG with one MDB across them. I am currently protecting the DAG and thus the Mailbox Database using DPM but not the actual systems themselves.

How can I recover the the servers that are members of a DAG when I have no servers left to run EMS commands against to remove Mailbox Databases etc (as per: http://technet.microsoft.com/en-us/library/dd638206%28v=exchg.150%29.aspx).

Is this type of recovery even possible in this total loss scenario or would I need system state or bare metal backups of the Exchange systems (I already have DPM protecting the DAG and mailbox database).

This particular disaster recovery situation does not seem to be well documented. Any help anyone could give me would be appreciated greatly.

Thanks

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Exchange 2013 Content Catalog Index Failed All Databases

December 2, 2012, 10:17 am
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I have  a two node DAG I have successfully updated the database copies no bad copies. The content catalog index on all copies shows as failed. Update-DatabaseCopy -catalogonly does not work. /have deleted thedatabase abd remounted it shows healthy and returns to failed catalog soon after have strict targets client needs HA. cant failover the database as a result. The content database is failed even on servers with one copy only on DAG member server. Help
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MailboxInSiteFailoverException - OWA session error on database *over (Exchange 2013 SP1)

March 25, 2014, 5:44 pm
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Hi all, I have noticed an issue with OWA when database(s) are failed over between DAG members.  The environments in question (issue can be reproduced in separate implementations of 2013 SP1 all-role servers) are 2 or more DAG members within the same AD site/subnet.  These are also fresh implementations with SP1 and not upgraded.  Exchange servers are load balanced via Netscaler. 

So to the issue - OWA users experience the below "..MailboxInSiteFailoverException" message when the database copy is activated.  Exchange does not immediately proxy the requests to the active database.  You can wait several minutes and the issue is resolved by refreshing the browser or if you recycle the MSExchangeOWAAppPool on both DAG members, the issue is resolved immediately (OWA session re-established on refresh).

Testing so far involved opening multiple OWA sessions and activating a database copy.  At that point, upon refresh of the browser the below error is shown (in all test browsers/sessions below) where I would expect any DAG member to be able to proxy the client request to the active database server immediately (and not after several minutes).

https://netscaler_LB/owa
https://ex2013server-1/owa
https://ex2013server-2/owa



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Exchange on the Cloud as DR Site

March 26, 2014, 8:18 am
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Hi Guys

I have Exchange 2013. Can I utilize any public cloud services to implement a DR scenario for my Exchange infrastructure???

How can this be achieved?

Can this provide seamless failover if the on premise Exchange goes down and seamless failback when the on premise Exchange is restored???

jk

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Exchange Server High-Availability

March 26, 2014, 10:56 am
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Greetings all,

I am deploying new Exchange Server 2013, and replacing the Edge Role by Symantec BrightMail Gateway,

as it is known, High availability could be achieved if Edge Servers deployed in DMZ by having two Edge Servers and pointing MX record on ISP server using Round Robin DNS

but, in case of deploying Symantec Appliance, how would it be achieved using only one appliance?

Kind Regards

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Sync outlook on premise mailbox and cloud mailbox for DR plans

March 26, 2014, 8:06 pm
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Is it possible to Sync outlook on premise mailbox and cloud mailbox for DR plans
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Exchange 2k13 SP 1 on Win2k12 R2 WILL DPM 2012 SP1 Support this?

March 27, 2014, 6:48 am
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Exchange 2k13 SP 1 on Win2k12 R2 WILL DPM 2012 SP1 Support this?

http://technet.microsoft.com/en-us/library/jj860400.aspx

DPM Support Matrix

With the provided support matrix from Technet, at first glance, I'd have to assume DPM 2012 SP 1 will support Exchange 2013 SP1 on Windows 2k12 R2. 

Maybe IM over thinking this but, DPM 2012 SP1 does not support Windows 2k12 R2???? Considering its the OS that provides VSS capabilities I don't see how it could backup Exchange if the OS is not supported. 

FYI: A DAG scenario will be implemented

Your thoughts? Thanks

Djoe

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Exchange server 2013 - Setting up DAG

March 27, 2014, 9:08 am
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Hi Guys,

I have an Exchange 2013 server(a single dedicated box with all the roles(MailBox and  Client Access) configured in it. Now I want to enable data redundancy and Failover. So, I want to setup a DAG and my idea is given below.

I Want to setup a 2 node DAG. The first node is my current working box and the second node is another box at a different location. I would then Install Exchange on the 2nd node with mailbox role on it. As it is a 2 node DAG, I would require another box as a witness server.

Please let me know if there is any flaws with the above setup. Also, let me know if I require a different Exchange server license for the second installation.

Thanks and Regards,

Nash Burns

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After configuring windows NLB on 2 CAS servers, OWA showing 404 error-Page not found

March 29, 2014, 3:31 am
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Windows 2012 HyperV Machines

2 CAS server (+ 1AD and Mailbox on other VMS)

COnfigured Windows NLB on cas

owa worked proper after configuring the ports as all open..but when one machine shut down, the OWA gone down..So configured with required ports in NLB then OWA itself got stopped !!

Biju Rajan

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Repair Exchange 2013

March 31, 2014, 5:37 am
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We installed Exchange 2013 on a VM server running Server 2008 R2 SP1 to test Exchange 2013

I ran through all the pre-installation prep steps and configured the exchange 2013 server.

Everything was looking fine.

Then I installed service pack 1 and Cumulative Update 2 and now the server will not start up.

It seems that some where in the installation of CU2 something went horribly wrong and stuffed up the Exchange 2013 installation. There are just too many errors to try and fix them one by one. Basically half the exchange 2013 services will not start.

I tried to run a repair install from the original installation media but I keep getting an error that the installation media is older than the installation currently on the server. I downloaded a new image from MS website that includes SP1 for exchange but keep getting the same error.

I tried to slipstream CU3 with the SP1 ISO I downloaded but I can't get that to work properly.

Any other suggestions short from using ADSIEdit to manually remove all the Exchange 2013 components from AD and then uninstalling Exchange 2013 from the server before re-installing from scratch?

Please bare in mind that we currently have a active exchange 2010 server in the domain that needs to run until the Exchange 2013 installation is tested and verified.

ANY assistance would be highly appreciated.

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Dynamic Quorum and new DAG (no CNO)

March 31, 2014, 11:27 am
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With Exchange 2013 SP1 on Windows 2012 R2, you can create a DAG without a CNO.  Which is great, I no longer need a CNO or IP address for my DAGs.  Which should make it much simpler to have a stretched DAG.  However without the CNO, I cannot figure out how to create a dynamic quorum since it does not show in the Failover Cluster Administrator.  Does this mean that I don't need Dynamic Quorum, or do I have to do it through Powershell, or can it not be done.  And if it is the last option am I better of having no dynamic quorum and a no CNO, or having a dynamic quorum with a CNO?
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Exchange server 2003 Pulbic Folder restore

March 31, 2014, 6:59 am
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Ok, I have a corrupt public folder (just a small one among all others. Exchange server sp3. I want to restore the folder with NTBackup. The best way is to create a simular server and restore on that one but i don't want to do that.

Is it possible to stop the Exchange services, move all content of MDBData to another place, start the Exchange services, do a restore of the Public Folders. Put the particular folder into a pst file, and then.... Stop services, delete everything in MDBData en move the original content back. Start the services and use Outlook to put the pst file back to it's place.

The tricky part is "can i move the original Exchange database back?" Will that work?

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