Solved

Exchange 2007 Cluster - Outage Causing "Split Brain" - Lost Emails

Posted on 2012-03-28
2
565 Views
Last Modified: 2012-03-28
We have a two node Exchange cluster (CCR) that experienced a non controlled outage on one of the nodes today (outage at 1pm). We have 5 Information Stores, and four of them came up on the Passive node with no problem. The fifth looked at first like it worked but then we realized that it was missing emails from the last week.

We then realized that on the Node B (Originally passive, now active) it showed that Information Store as "Initalizing" and the Information Store Logs had not been replicated for over a week from Node A.

We tried to dismount (and suspend replication) the broken Information Store and transfer back to Node A (used the -IgnoreDismount switch) and it worked but we then had all emails prior to the outage but none between 1pm and 5pm when we took down the server again for maintenance. We then realized that the log files were re-creating on Node A and were conflicting with the log files on Node B. At this point I think we have a "Split Brain" convergence of the Information Stores. We have a backup and snapshot of both Node A and Node B .edb and log files before we started to troubleshoot this problem so we could roll back.


Are there any options? Is the best option to get Node A working up to 1pm, re-seed Node B, then use the backup of Node B .edb and log files into a DR environment and then just export the changes since 1 pm in mail to a PST (and give to the users)? Are there better options? Could we use the Exchange Recovery Group?
0
Comment
Question by:rsp_it
  • 2
2 Comments
 

Author Comment

by:rsp_it
Comment Utility
We don't think an eseutil /r will work on Node A since the log file file names are the same as Node B. It feels like a split brain and our only option is to choose one of the versions of the DB and then go from there trying to recover as much data as we can between 1pm and 5pm.
0
 

Accepted Solution

by:
rsp_it earned 0 total points
Comment Utility
We ended up resolving this ourselves by moving back to Node A, losing information between 1pm and 5pm. Then we used Recovery Storage Groups with Node B's database version and the "merge" functionality to get the old emails between 1pm and 5pm back.
0

Featured Post

Wish Marketing would stop bothering you?

Is your marketing department constantly asking for new email signature updates? Are they requesting a different design for every department? Do they need yet another banner added? Don’t let it get you down! There is an easy way to manage all of these requests...

Join & Write a Comment

Marketers need statistics and metrics like everybody else needs oxygen. In this article we explain how to enable marketing campaign statistics for Microsoft Exchange mail.
Learn to move / copy / export exchange contacts to iPhone without using any software. Also see the issues in configuration of exchange with iPhone to migrate contacts.
In this video we show how to create a Resource Mailbox in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: Navigate to the Recipients >> Resources tab.: "Recipients" is our default selection …
In this video we show how to create an Address List in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Organization >> Ad…

771 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

10 Experts available now in Live!

Get 1:1 Help Now