HP Storage Mirroring Software - Manual (Page 209)

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Configure how you want to monitor the source server for failure.
1. By default, Active Monitoring Enabled is selected. Active Monitoring allows you
to enable or disable failover for the selected source/target pair.
2. By default, Manual Intervention Required is selected. Manual intervention allows
you to control when failover occurs. When a failure occurs, a prompt appears and
waits for you to initiate the failover process manually.
Disable Manual Intervention Required only if you want failover to occur
immediately when a failure condition is met.
3. In the Method to monitor for Failover field, select the ping method to use when
monitoring source IP addresses.
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Network Access (ICMP)—Storage Mirroring Recover 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.
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Replication Service (UDP)—The Storage Mirroring service on the target
server sends a ping-like UDP request to the source Storage Mirroring