1. 1 © 2003, Cisco Systems, Inc. All rights reserved. Proprietary and Confidential Unity Connection 7.0(1) Messaging Redundancy TOI July 2008 Jane Rygg jrygg@cisco.com

2. 222 © 2003, Cisco Systems, Inc. All rights reserved. Proprietary and Confidential Presentation_ID Overview Server Roles Split Brain System Maintenance Troubleshooting

3. 333 © 2003, Cisco Systems, Inc. All rights reserved. Proprietary and Confidential Presentation_ID Server Roles Primary Message store database access MTA Notifier Secondary Warm copy of message store database Both servers Message store attachment access (file system) UMSS IMAP Server SMTP Server

4. 444 © 2003, Cisco Systems, Inc. All rights reserved. Proprietary and Confidential Presentation_ID Primary Server

5. 555 © 2003, Cisco Systems, Inc. All rights reserved. Proprietary and Confidential Presentation_ID Secondary Server

6. 666 © 2003, Cisco Systems, Inc. All rights reserved. Proprietary and Confidential Presentation_ID Message Flow - Delivery

7. 777 © 2003, Cisco Systems, Inc. All rights reserved. Proprietary and Confidential Presentation_ID SMTP Notification Notifications sent from server with primary role. Link to PCA in SMTP notification messages will default to the server hostname which sends the notification. Address to use in the PCA link can be configured on CUCA, Advanced Settings, Connection Administration: Host Name/Address for Link to Cisco PCA in Notification Messages

8. 888 © 2003, Cisco Systems, Inc. All rights reserved. Proprietary and Confidential Presentation_ID Split Brain Split Brain occurs when connectivity between the servers is lost and both become primary Changes to the message store (database and attachments in the file system) queue up Messages are stamped with identifiers called UIDs. Each message in a mailbox has a UID unique to the mailbox. During Split Brain, the servers may create messages with the same UIDs.

9. 999 © 2003, Cisco Systems, Inc. All rights reserved. Proprietary and Confidential Presentation_ID Split Brain Recovery Split Brain Resolution occurs when the servers reconnect. The databases are reconciled with last write win. A script is called to renumber messages those messages that arrived during Split Brain so that message UIDs are again unique within the mailbox. If Split Brain continues for a while, it could happen that the changes during Split Brain are too many to be queued and in this situation messages can be lost.

10. 10 © 2003, Cisco Systems, Inc. All rights reserved. Proprietary and Confidential Presentation_ID System Maintenance Multiple Mail Stores UMSS Tasks

11. 11 © 2003, Cisco Systems, Inc. All rights reserved. Proprietary and Confidential Presentation_ID Multiple Mail Stores Up to 5 may be created UnityMbxDb1 is default Create/delete from publisher (1 st node in cluster) Move mailboxes between mail stores on either publisher or subscriber

12. 12 © 2003, Cisco Systems, Inc. All rights reserved. Proprietary and Confidential Presentation_ID Mailbox Store Size(s) Mail store attachment size should be the same on the servers The current size shown on the Mailbox Store page is the size of the attachments on the disk on the primary. The Monitor Disk Space Task on each server will report disk usage for each mailbox store. A discrepancy in disk usage between the servers may indicate a file sync problem

13. 13 © 2003, Cisco Systems, Inc. All rights reserved. Proprietary and Confidential Presentation_ID UMSS Tasks that run on Primary only Message Aging Based on message aging rules, cleans expired messages from the mailbox of the Unity Subscriber. Does not delete associated audio file(s). Clean Deleted Messages This task deletes messages from Unity databases and the file system which are marked to have no recipients Clean Lost Deleted Messages This task deletes messages from Unity databases and the file system which have no recipients. More thorough than the task above but run less often for performance reasons. Monitor System Mailboxes Monitors the system mailboxes and reports the number of messages per mailbox. Clean Orphaned Messages Cleans orphaned messages from the Unity database and the file system. Note: Rare and unexpected error case

14. 14 © 2003, Cisco Systems, Inc. All rights reserved. Proprietary and Confidential Presentation_ID UMSS Tasks that run on both servers Monitor Bad Mail Monitors the MTA bad mail and STMP bad mail folders, which may contain messages that could not be delivered or NDRed, and reports the number of messages. Clean Orphaned Message Stream Files Cleans orphaned message stream files from the file system. Note: Rare and unexpected error case Purge Empty Message Stream File Directories Removes directories from which all message stream files have been deleted Monitor Disk Space Monitors Unity System disk usage and sends alerts if disk volume is getting full or mail stores approaching specified max size. Refresh Mail Store Sizes Refreshes cached mail store attachment size. Background task for performance reasons.

15. 15 © 2003, Cisco Systems, Inc. All rights reserved. Proprietary and Confidential Presentation_ID Troubleshooting File replication service not running

16. 16 © 2003, Cisco Systems, Inc. All rights reserved. Proprietary and Confidential Presentation_ID 16 © 2001, Cisco Systems, Inc. All rights reserved. Presentation_ID