A database availability group (DAG) is the base component of the high availability and site resilience and is a boundary for mailbox database replication.

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Is is a good idea to put SMTP Shadow replication on the same VLAN as DAG replication?

We have a VLAN for DAG replication, Recoverpoint (SQL Data), and right now SMTP Shadow replication is going over with the production traffic. Should shadow replication be limited to the site? Should ...
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173 views

What topology to choose for 2 locations with 2x Exchange 2010 licenses (with more to be bought eventually?

We want to introduce Exchange 2010 in our organization. We have 2 locations: Main location has 2 ISP links used with one Forefront TMG 2010 (100 people on site) Second location has 1 ISP link with ...
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611 views

Exchange, CAS, KEMP Load Balancer issue

We recently purchased 2 Kemp 2200 Load Balancers for our Exchange DAG (3 servers). We created the virtual service IP in KEMP that all the mail traffic will go to. We replaced the Exchange IP in the ...
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475 views

Exchange DAG fails over during backup

It seems like every night during our backup process, the Exchange DAG fails over. Is it possible to change a tolerance setting to prevent the DAG from unnecessarily failing over during backup times?
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What database am I seeding from in a stretched DAG?

I have a stretched DAG across 2 sites, with 4 copies. One of the remote copies failed, and I issued a re-seed operation with the remote&working copy as a source. Knowing this, I tried to work ...
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138 views

DFS-R not working on Server 2012 with Exchange DAG

We have 2 servers running a small network. The goal is to have the 2 servers as HA servers on a low budget. Therefore we deployed Windows Server 2012 and configured DFS-R which all worked fine. We ...
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54 views

When CopyQueueLength is high, how do I control which server is the source?

When I have a DAG with copies spread all over the world, and the initial seeding is already complete, how does Exchange control which server is used to fulfill the outstanding CopyQueueLength logs ...
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116 views

Exchange 2010 DAG DAC mode would prevent having some databases active on secondary site?

If I have a two nodes Exchange 2010 DAG stretched over two sites with DAC mode enabled and all databases active on primary site, I would still be able to activate some databases on the secondary site ...
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125 views

Exchange 2010 DAG and CAS Array online and fine but Outlook clients can't connect anymore

I come to you while in a bind : I have two Exchange 2010 SP3 servers installed in the same site, with a DAG working fine, database is mounted on server #1 (index is healthy). I configured a DNS Round ...
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65 views

MPLS outage on a 4 member DAG causes Exchange / Outlook to hang

We have two sites, with two servers in each one. DAC Mode (Datacenter Activation Mode) is enabled. One peculiar thing about this network is that the Primary and the Alternate shares are set to the ...
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184 views

Exchange 2013 DAG Cluster Errors on non-owner node (eventid 1231)

We have a simple 2 node DAG setup with the nodes in 2 different sites. The DAG seems to be working fine, with mailbox databases moving back and forth between servers on-demand without issue. Seeding ...