Failover occurs when users cannot access the server that contains the database they want or they cannot access the database itself.

The following are potential failover actions and causes:

• Unable to access server
  • The server is down.
  • There are network connectivity problems.
  • The server has reached the maximum number of users allowed (set with Server_MaxUsers in NOTES.INI).
  • The server is restricted by the administrator (using the Server_Restricted setting in NOTES.INI).
  • The server is BUSY because it has reached the maximum load allowed (the server availability threshold).
• Unable to access database
  • The database is marked Out of Service in the Cluster Database Directory.
  • The database is marked Pending Delete in the Cluster Database Directory.

• Database open operations
  • Database open operations
  • Opening a database from a bookmark
  • Clicking a document link, a view link, or a database link
  • Using Domain Search when a clustered indexing server is unavailable
  • Accessing roaming files when a clustered roaming server is unavailable
  • Activating a field, action, or button that contains @command ([FileOpenDatabase])
  • Running a LotusScript® routine that contains the OpenWithFailover method of the NotesDatabase class
  • Using Java™ that contains the OpenDatabase method of the DbDirectory class
  • Replicating with a database on a cluster server that is not running or not reachable on the network
• Mail and calendar server operations
  • Sending mail
  • Name lookups
  • Type-ahead
  • Routing mail messages
  • Mail predelivery agents
  • Meeting invitations
  • Free time lookups
  • Server lookups
• Web server operations
  • Selecting the Open URL icon
  • Clicking a URL hotspot
  • Accessing a URL with a Web browser

Failover does not occur in the following cases:

• When a server becomes unavailable while a user has a database open

  Tip: The user can reopen the database, which causes failover to a different replica, if one exists in the cluster. If the user was editing a document when the server became unavailable, the user can copy the document to the replica.

• When a user chooses File -> Application -> Properties or File -> Application -> Open.
• When the router attempts to deliver mail and mail routing failover is disabled or MailClusterFailover is set to 0
• When the template server is unavailable while creating a new database
• When a server fails while running agents, other than the mail predelivery agents
• When a server fails while running the Administration Process
• When replicating with a server that is restricted by the administrator or has reached the maximum number of users or the maximum usage level set by the administrator
• When replicating with a database marked Out of Service

Related concepts
What is a Domino cluster?

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