If i shut one dag member down, i can connect to the other dag server using this ip address, regardless of which dag member has been shut down. Oct 20, 2010 there are some worthwhile observations to make regarding the role of the failover cluster in exchange 2010, when compared to its counterpart in exchange 2007. Planning, deploying, and testing an exchange 2010 siteresilient solution sized for a medium organization. Exchange 2010 manually fix a down exchange organization. With the introduction of database availability groups dag in exchange 2010, microsoft greatly improved and simplified the availability and resilience of the exchange mailbox server role. Within the failover cluster, it will look like this, for which ever is the current cluster host server is which dag. Manage database availability groups microsoft docs. Exchange 2010 is ad site aware and will only use servers in the same site. Exchange 2010 dag failover issue database activation fails because content index catalog failed.
Apr 09, 2012 this is how cluster and dag looks at the end of adding 5 nodes. May 17, 2010 exchange 2010 dag failover issue database activation fails because content index catalog failed. Exchange server 2010 dags and vmware high availability. A unique name for dag is required which can be not more than 15 characters long. Add second mx record to point to secondary exchange server. Ive found that exchange 2010 database copies in a dag group have a tendency to fail if the dag cluster is geographically distributed, and the wan goes down occasionally. Exchange 2010 server dag failover unexpectedly event 4082. Lets say i have 2 exchange servers with local storage and dag setup in a single site.
This solution provides an endtoend architecture with cisco, vmware, microsoft, and netapp technologies that demonstrates how microsoft exchange 2010 servers can be virtualized to support around 10,000 user mailboxes and to provide high availability and redundancy for. Exchange 2010 dag support within virtualised clusters. First before creating dag we need to make sure network setup is set in proper in place. Everything is working fine, but i wanted to create a switchover procedure in the event of a problem. Is dag for exchange 2010 an automatic or manual failover. Disaster recovery using exchange 2010 database availability. Exchange 2010 dag failover cluster dns issues server fault. Managing high availability and site resilience microsoft docs. Exchange server 2010 database availability group installation. Hi again, ive recently had an unusual situation i wanted to share. Dag is a new concept to the exchange application clustering on the database level. Installation of the windows failover clustering components. My boss believes that because the 2 server are members of a dag, if server1 goes down, clients can connect to the cas on server2 and connectivity.
Activesync devices are not automatically redirected to. These problems go away once the cluster settings are changed to something more sane. We have two servers in a test environment, with exchange 2010, a dag setup between the two, a witness server to determine quorum, and a cas array that both are a part of. If you had a dag, then failing the databases over to the same site would mean email would flow. The project calls for some sort of failover capability but without the use of ms clustering services. Microsoft exchange 2010 with vmware vsphere on cisco unified.
Each site has 2 cashub servers and 2 mailbox servers. Dec 10, 2010 exchange 2010 dag local and site drfailover and fail back december 10, 2010 krishna mvp exchange 2010 45 comments microsoft exchange dr and high availability features have evolved a long way to reach dag in exchange 2010. We will be using exchange 2010 to deliver timesensitive email alerts to known users outside of our organization lets call our org internal. Exchange 2010 dag members and cluster quorum configuration. Currently, the cisco ace is available as an appliance or integrated service module in the cisco catalyst 6500 platform. Has anyone ran through the using microsoft exchange 2010 with cisco unity versions 8. As already mentioned, two nics have been installed in each server. Jun 07, 2012 each site has 2 cashub servers and 2 mailbox servers. Exchange 2010 dag failover cas server solutions experts.
By default, fcs has fairly low timeouts that are ideal for use in fast localised lan environments if you operate your exchange 2010 dags over a wan where issues such as latency and packet loss can occur. Configure two exchange 2010 machines for failover server fault. Exchange 2010 dags use windows failover clustering. Vsphere virtualization best practices for exchange 2010. My vmware environment is esxi 5 with all the latest updates and patches and all my exchange 2010 servers are virtual. Exchange 2010 dagserver switchover solutions experts. By default exchange dag will failover with nothing more than a couple seconds delay caused by snapshot stun. To get exchange 2010 up and running in the failover datacenter, i basically went through the steps described in part 12 of my planning, deploying, and testing an exchange 2010 siteresilient solution sized for a medium organization articles series. Disable automatic dag failover for an entire server. Planning, deploying, and testing an exchange 2010 site. Office powershell script for exchange 2010 automatic. Dag failover behavior for outlook clients outlook forums. Exchange 2010 dag support within virtualised clusters one of the major new features within exchange 2010 is the database availabilty group dag.
Decreasing exchange 2010 dag failover sensitivity by. Exchange 2010 dag creation and configuration, part 2 simple talk. Therefore, in this particular configuration, an external load balancing solution will be required. Solved exchange 2010 2 server dag all roles spiceworks. Exchange 2010 manually fix a down exchange organization that uses dac mode. I am having an issues with my exchange 2010 servers. Sep 19, 2014 today lets discuss moving the active database copy to another database. In this example, we manually activate the mailbox database on the exchange server in the. Exchange 2010 dag provides more robust, easy and quicker ha and dr failover faculty. The new failover isnt really build on a two server setup. With this configuration, i found that exchange 20 dag communication worked fine through the microsoft failover cluster virtual adapter ipv6 only when the two exchange 20 vms were hosted on the same hyperv host. Aug 05, 2011 whem running an exchange 2010 dag over a wan, you may run into some of the limitations of microsoft fcs failover cluster service. Each queue represents a logical set of messages that the exchange server processes in a specific order.
Finally, you can run this script to redistribute the active mailbox databases across the dag. Troubleshooting exchange 2010 dags across wans kraft. Configuring dag database availability group in exchange 2010 is a straightforward process. If you have two ad sites then you will need a second hub transport server in both sites for redundancy.
The documentation is unclear to me how this should be executed if unity is running as a failover pair. Dag provides the features to recover exchange 2010 database from. For your exchange 2010 dag poc, you will need 4 virtual windows server 2008 r2 servers. All outlook clients are currently connected to server1, and the rpcclientaccessserver attribute are pointing to server1 for all the databases. Gss provides site failover in this multisite exchange environment by. Exchange 2010 sp1sp2 dag on vmware fail over with veeam posted by desktop feedbag. Note following points before you start configuring dag in exchange 2010. A whole industry arose around exchange database recovery of a. Aug 23, 2010 with exchange 2010 sp1 or later deployed. So, either ask us about exchange 2010 v exchange 2007 or go to a windows forum and ask about failover clustering. Microsoft exchange 2010 with vmware vsphere on cisco. Dag uses windows failover clustering to provide failover on the mailbox database. Exchange 2010 dag failover during backup so we have two exchange mailbox servers and theyre setup by our exchange admin to failover to the alternate server in the event of an application or hardware issue. Exchange internally calls use the cluster api, which validate quorum model based on number of nodes in cluster.
It is uses asynchronous replication and log reply technology concept from exchange 2007 ccr and scr. I have not experienced any failures like this since updating my nic firmware and hp network management software on the machine, but since internet at my other site is a little shaky i think increasing the cluster tolerances is probably wise to do as well. In my experience, when you have exchange 2010 in a volatile environment, you open yourself up to the cluster behaviors of the exchange cluster to behave unexpectedly, or just plain fail. Powershell script for exchange 2010 automatic failover. Switchovers are typically done to prepare for performing a maintenance operation. As a brief description, a dag is a group of up to 16 mailbox servers that hosts a set of databases. A queue is a temporary holding location for messages that are waiting to enter the next stage of processing or delivery to a destination.
Today lets discuss moving the active database copy to another database. Failover cluster service for exchange 2010 dag over wan. Exchange 2003 infrastructure at cisco exchange 2010 infrastructure at cisco five sites worldwide 220 servers, 40 rack spaces 10% average cpu utilization 0. Manually failover database in exchange 2010 dag mustbegeek.
May 29, 2012 manually failover database in exchange 2010 dag. What is the best way to suspend automatic failover to that server, whilst still keeping the databases replicated and seeding from the primary site. Whem running an exchange 2010 dag over a wan, you may run into some of the limitations of microsoft fcs failover cluster service. Cisco ucs and application delivery for microsoft hyperv. Changes to high availability and site resilience over previous versions of exchange server. Offline seed of exchange 2010 db in dag environment. Exchange 2010 dag failover with lost members and homemta. This replaces high availability options from previous versions of exchange such as scr and ccr it essentially works by having multiple copies of the same exchange databases replicated across. Exchange dag node failure force switchover with queues. Solved issue with dag failover ms exchange spiceworks. As a usual practeice, you have the vincity of do it in two ways, using exchange manage shell and exchange management console. Exchange 2010 dag local and site drfailover and fail back. Aug 24, 2014 creating dag stepbystep in exchange server 2010. Jul 16, 2012 with the introduction of database availability groups dag in exchange 2010, microsoft greatly improved and simplified the availability and resilience of the exchange mailbox server role.
Posted in dag, exchange 2010, powershell post navigation. Exchange 2010 dag local and site drfailover and failback. A client of mine had a geographically stretched exchange 2010 dag cluster that crashed really bad, the original active servers had been lost beyond repair luckily the databases were replicated to another location, so the data was saved. Database availability groupsdags in exchange 2010 is data redundancy, high availability and disaster recovery feature. Exchange 2010 dag creation and configuration part 1 simple talk.
As a next step, i ran the validate a configuration wizard for the dags underlying windows failover cluster and, sure enough, rpc errors were reported for queries that needed to cross the wan to talk to cluster nodes not in the same data center as the node on which the wizard was run. A dag is a group of up to 16 mailbox servers that hosts a set of databases and provides automatic databaselevel. It will check the health of database replication and the replication infrastructure, using the testreplicationhealth cmdlet. Oct 09, 2011 in addition, the dag runs in dac mode. I have two servers that have hubcasmailbox installed on them. Cluster ip address resource cluster ip address cannot be brought online posted on june 18, 2010 by workinghardinit today i was called upon to investigate an issue with an exchange 2010 database availability group that had serious backup issues with symantec backup exec not working. I had this issue with a client last week, the system was exchange 2010 with a 2 node database availability group dag setup. Both sites are internetfacing, and tmg is publishing in both sites. Leave a comment if you have a dag setup in your exchange 2010 sp1sp2 environment and running veeam as your osapplication backup solution you will need to make some cluster timeout changes. Exchange 2010 dag creation and configuration, part 2 simple. How to create a dag database availability group in exchange 2010 the dag has an ip address set. Planning, deploying, and testing an exchange 2010 siteresilient solution sized for a medium organization part introduction in part 11 of this multipart article, we simulated a client access server failure and saw how exchange clients were affected by this type of failover. This solution provides an endtoend architecture with cisco, vmware, microsoft, and netapp technologies that demonstrates how microsoft exchange 2010 servers can be virtualized to support around 10,000 user mailboxes and to provide high availability and redundancy for server and site failover. I have one small problem in that the databases seem to failover frequently to site b.
Create a dag between our primary exchange server and new secondary server. Exchange server virtual machines including exchange mailbox virtual machines that are part of a dag, may be combined with hostbased failover clustering and migration technology, as long as the virtual machines are configured such that they will not save and restore state on disk when moved, or. Baically a manual way of changing the clients across rather than using a. If the witness server you specify isnt an exchange 2010 or later server, you must add the. This script is designed to do a partial failover, where dag membership is not changed, and a full failover that does remove dag members. In a wan environment, where latency may be higher, and some packet loss may occur, you may need to. Changes to high availability and site resilience over. Exchange 2010 sp1sp2 dag on vmware fail over with veeam. To perform a manual failover of the database using exchange management console, following are the steps. Eac, you must configure the dag for manual network control by modifying the properties of the dag using eac. A switchover is a scheduled outage of a database or server thats explicitly initiated by a cmdlet or by the managed availability system in exchange server.
The cisco ace provides a highly available and scalable data center solution from which the microsoft exchange server 2010 application environment can benefit. The new concept of the database availability group dag is exciting exchange 2010 technology to bring low cost high availability without costly hardware san infrastructure. Real life exchange 2010 site switchover lesson learned. Exchange 2010 sp1 dag step by step proof of concept. Find answers to is dag for exchange 2010 an automatic or manual failover solution from the expert community at experts exchange. Dag provides the features to recover exchange 2010 database from database, server or network failures. Switchovers and failovers are the two forms of outages in microsoft exchange server. Moving the active database copy to another dag member in. After you build, validate, and deploy a microsoft exchange server high availability or site resilience solution, the solution transitions from the deployment phase to the operational phase of the overall solution lifecycle. The two mailbox servers are running one database setup in a dag. On failover in exchange 2010, the database cache is flushed as the database is converted from a passive copy to an active copy. Powershell script for exchange 2010 automatic failover, failback and recovery scripts for databases, database copies and dns top all forums network experts virtualization experts cisco extropedia drupal extropedia microsoft extropedia mysql vmware extropedia.
A database availability group dag is the base component of the high availability and site resilience framework built into microsoft exchange server 2010. If you havent read up on the functioningexistence of database availability groups dag and cas failover of exchange 2010, youll probably think that its a breeze. The mailbox servers are running in a dag configuration. It supports both planned and unplanned failovers, where the servers are offline. Each server that is a member of the dag is capable of hosting active or passive copies of mailbox databases that reside on servers in the group. In a wan environment, where latency may be higher, and some packet loss may occur, you may need to tweak the timeouts for fcs.
Best practice to manually move any active database copies to another dag member in the dag. Exchange 2010 datacenter switchovers and this exchange 2010 datacenter switchover tool. Leveraging exchange 2010s builtin high availability and site failover technology. Let us look at the way each nic has been configured.
Moving the database comes into picture when its planned outage or maintenance. Dag failover behavior for outlook clients outlook forums by. Next allowing endusers to manage distribution group membership in exchange 2010. Similar to jobs program when corporate fixes a broken or manual process. If you choose the latter and even mention exchange 2010 youll be told to go away and come back here. Aug 30, 2012 when exchange 2010 was released and the dag feature was first introduced everybody was excited about it and looking forward to deploy it, but performing the disaster recovery is a nightmare because it requires multiple steps so i thought sharing the steps to do a site switchover in a scenario based will help many people who would like to either. I expereienced an issue recently where the dns entry for the dag and the mail01 server where missing from dns on the domain controllers. In microsoft exchange server 2010, the base component of its high availability and site resilience framework is the database availability group.
Ok ive got 2 exchange 2010 servers that run client accesshub transportmailbox roles and one exchange 2010 server running just client accesshub transport roles and acts as my bridgehead. May 28, 2010 powershell script for exchange 2010 automatic failover, failback and recovery powershell script for exchange 2010 automatic failover, failback and recovery scripts for databases, database copies and dns. Microsoft exchange dr and high availability features have evolved a long way to reach dag in exchange 2010. Failover event is unplanned, such as a failure of the server hosting the active copy. For example, the red highlight box in figure 6 shows the failover cluster manager snapin expanded out to reveal that the name of the cluster is derived from the name of the dag. How to work on cross site failure in exchange 2010. As explained in the exchange 2010 product documentation, under the section titled twomember dag in single datacenteractive directory site, this is because wnlb and windows failover clustering cannot be installed on the same server.
Create a new multirole exchange 2010 server same os, version number, etc at our secondary site. This is how cluster and dag looks at the end of adding 5 nodes. Just make sure that the server you are running the scripts from has the windows failover cluster management tools installed. Database availability group configure in exchange 2010. You can manually assign ip addresses to the dag by using the. Cisco drupal microsoft mysql networking online tips and tricks virtualization vmware. Server a shows the db mounted and server b shows healthy. Both servers are members of a dag for database failover. Exchange server 2010 database availability group overview a database availability group is a group of up to 16 exchange server 2010 servers that are installed with the mailbox server role. Oct 18, 2010 exchange server 2010 database availability group overview a database availability group is a group of up to 16 exchange server 2010 servers that are installed with the mailbox server role. I really cant say it any more robustly than stop looking at the clustering pages for windows 2008 when youre thinking about. You can add dag ip addresses using the console in the properties of the dag. I will just run throw the steps on creating and configuring dag on the above. Using exchange 2010 dag for replication only and not for cluster failover.
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