HP Storage Mirroring V5 Software - Manual (Page 105)

HP StorageWorks Storage Mirroring Application Manager user’s guide 95
10 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 97.
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.
NOTE: Protection Status and Monitoring Status on the main screen 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.
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.