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IP conflict Exchange 2007 CCR on Windows 2003
IP conflict Exchange 2007 CCR on Windows 2003
- Hi,
I realized that I have an IP conflict beetween my mailbox cluster. NODE1 lost connection with NODE2 then it wants to be the active node but NODE2 is still online so the result is a IP conflict and cluster failed. It never happens before.
Exchange 2007 is on CCR mode in Windows 2003 R2 Ent.
Have you ever experiment this issue?
Thank you.
Answers
Raj Sharma: Minimum four IP addresses will be used on case of a cluster. Are you repeating your IP addresses some where on the configuration.
A minimum of 6 IP addresses are needed on a CCR cluster
Deployment Checklist for Cluster Continuous Replication on Windows Server 2003
http://technet.microsoft.com/en-us/library/bb885051.aspx
Seems like a split-brain syndrome, an issue with the Majority Node Set quorum with file share witness
http://technet.microsoft.com/en-us/library/bb124521.aspx
If I got the situation right:
NODE2 was active, hence NODE1 passive. Now NODE1 does not receive any heartbeat on the private NIC. NODE1 thinks NODE2 is down and tries to get hold of the MNS quorum and succeeds (partly?). That's how the IP conflict arises. Both nodes think they are the sole owner of the cluster resources and try to bring them up.
First thing to do then is check out all network interfaces and switches involved. Make sure that the active node can communicate with the File share Witness.
Jon-Alfred Smith MCTS: Messaging | MCSE: S+M- Marked As Answer byJames-LuoMSFT, ModeratorThursday, November 12, 2009 1:23 AM
- Proposed As Answer byJames-LuoMSFT, ModeratorMonday, November 02, 2009 5:48 AM
All Replies
- Hi,
what do you mean by by "node 2 is still online". Both the nodes will always be online, its just that passive node will not be a active node (will not be the owner of the resources).
Minimum four IP addresses will be used on case of a cluster. Are you repating your IP addresses some where on the configuration.
Raj Raj Sharma: Minimum four IP addresses will be used on case of a cluster. Are you repeating your IP addresses some where on the configuration.
A minimum of 6 IP addresses are needed on a CCR cluster
Deployment Checklist for Cluster Continuous Replication on Windows Server 2003
http://technet.microsoft.com/en-us/library/bb885051.aspx
Seems like a split-brain syndrome, an issue with the Majority Node Set quorum with file share witness
http://technet.microsoft.com/en-us/library/bb124521.aspx
If I got the situation right:
NODE2 was active, hence NODE1 passive. Now NODE1 does not receive any heartbeat on the private NIC. NODE1 thinks NODE2 is down and tries to get hold of the MNS quorum and succeeds (partly?). That's how the IP conflict arises. Both nodes think they are the sole owner of the cluster resources and try to bring them up.
First thing to do then is check out all network interfaces and switches involved. Make sure that the active node can communicate with the File share Witness.
Jon-Alfred Smith MCTS: Messaging | MCSE: S+M- Marked As Answer byJames-LuoMSFT, ModeratorThursday, November 12, 2009 1:23 AM
- Proposed As Answer byJames-LuoMSFT, ModeratorMonday, November 02, 2009 5:48 AM
- Ya you understand well Jon and yes I have 6 ip adr: 4 ip for private and public and 2 for windows and exchange clusters
I will check the File Share Witness and see what happen...weird that it happens suddently like that???
Thanks. - Any update?
James Luo
TechNet Subscriber Support (http://technet.microsoft.com/en-us/subscriptions/ms788697.aspx)
If you have any feedback on our support, please contact tngfb@microsoft.com - Hi,
Since I moved the cluster to the other node there is no prob anymore...I think somebody has changed something without informing me... Thank you again ofr all your help!
