HP Storage Mirroring V5 Software - Manual (Page 33)

HP StorageWorks Storage Mirroring Application Manager user’s guide 23
stopped on the target for replication to occur properly. When you are finished entering services, click Add to
return to the Failover configuration window.
To remove a service, select one or more services, then click Remove . You can only remove services that you
added manually using the Application Manager.
Services will be started in the displayed order (top-to-bottom starting with the left column) and shutdown in
reverse order (bottom-to-top starting with the right column).
To re-arrange the order in which services are started/stopped, first add any additional services. Select a
service in the list, and use the up and down arrow buttons to move the service to the appropriate position in
startup/shutdown order.
Resources (cluster only)
If you are using clustered Exchange servers, during configuration, you will select resources instead of services
to bring online and offline during failover. The Resource selection works exactly like the service selection
functionality.
NOTE: If you are using Exchange in a cluster-to-standalone configuration and have selected a source cluster
server, a button will appear in the Services/Resources area, allowing you to toggle between services to start on
the target, and Resources to start on the source.
Method to monitor for failover
The method to monitor for failover specifies the ping method to use when monitoring source IP addresses.
• Network Access (ICMP) —Storage Mirroring failover uses ICMP pings to determine if the source server is
online. If a network device, such as a firewall or router, between the source and target is blocking ICMP
traffic, failover monitors cannot be created or used.
• Replication Service (UDP) —The Storage Mirroring service on the target server sends a ping-like UDP request
to the source Storage Mirroring service, which replies immediately to confirm it is running. This method is
useful when ICMP is blocked on routers between the source and target.
Failover monitoring options
The amount of time before failover begins is calculated by multiplying the Failover Interval by the Missed
Packets. For example, if the Failover Interval is set to 5 seconds and the Missed Packets setting is 5, a failover
condition will be identified after 25 seconds of missed source activity.