HP Storage Mirroring V4.5 Software - Manual (Page 133)

11 - 1
Failover, Failback, and
Restoration
If you selected DNS failover, you can use the Application Manager to automate failover, failback, and
restoration. If you selected Identity failover, you will need to use the manual processes described in
Identity failover, failback, and restoration on page 11-4.
If an error occurs during failover or failback, a message box will appear. You can use the Actions
menu to launch the failover and failback log files.
DNS failover, failback, and restoration
Based on the current protection status and/or failover state, the Failover/Failback button on the
Monitor tab and menu options will be updated to display the available command. If the Application
Manager is not in a state that will allow failover or failback to be executed, the Failover/Failback
button and menu option will be grayed out (disabled).
In the Application Manager, there are two ways that failover can be initiated:

Automatically, when a failover condition has been met (such as if the source has gone down)

Manually (for instance, when you want to do maintenance or upgrades on the source server)
In order to initiate either an automatic or manual failover, the source and target servers must already
be configured so that the Protection Status is Protected and Monitoring Status is Enabled.
During failover and failback, the status messages at the bottom of the screen describe the failover or
failback progress.
Initiating automatic failover
When the Manual Intervention Required option is selected on the Failover tab of the Configure
Protection window, a prompt will occur when a failover condition is met. For more information about
setting failover options, see the Failover settings section for your application.
If you cleared the Manual Intervention Required option and have failover enabled for your server
pair, failover will occur automatically when a failover condition is met.
NOTE:

Protection Status and Monitoring Status on the Setup tab are not updated during
failover and failback.

The refresh update rate is not automatically updated during failover and failback.

When using Application Manager for Exchange:

If your SMTP gateway (or vendor) is configured to send mail to a specific IP
address and that IP address is not failed over to the target, you will need to change
it during failover.

While in a failed over state, you cannot log in to the domain from the source
Exchange server. This is because the target has assumed the source server's host
Service Principal Names to allow Outlook Web Access to be accessed using the
source name. If you need to log in to the domain and OWA is not needed, contact
Hewlett-Packard Technical Support for a workaround.

When using Application Manager for file servers, the failover button will only work
after the source server is offline. This is necessary to prevent name conflicts on the
network when the name is failed over.