HP Storage Mirroring V4.5 Software - Manual (Page 116)

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3. In the Method to monitor for Failover field, select 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.
4. Configure how long to wait after a source failure to initiate failover. The amount of time before
failover begins is calculated by multiplying the Monitor Interval by the Missed Packets. For
example, if the Monitor 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.
a. In the Monitor Interval field, select how often the monitor should check the source
machine availability (Default = 5 seconds).
b. In the Missed Packets field, select how many monitor replies can be missed before
assuming the source machine has failed (Default = 5 missed replies).
5. If you are monitoring multiple IP addresses, select one of the Failover Trigger options.

All Monitored IP Addresses Fail—Failover begins when all monitored IP addresses fail.

One Monitored IP Address Fails—Failover begins when any of the monitored IP addresses
fail.
Snapshot settings
The following allow you to set up snapshots of your target data that can be used when failing over.
By default, snapshots are not enabled in the Application Manager.
1. To enable snapshots, select the Enable periodic snapshots checkbox. This will enable the
remaining controls.
2. In the Snapshot interval field, select the interval at which you want to perform snapshots (in
minutes). The minimum interval is 15 minutes.
3. Select one of the following options for when to begin collecting snapshots:

Start now—Select this option to take the first snapshot as soon as protection is enabled.

Start at—Select this option to start taking snapshots at a future time. If you select this option,
you will also need to enter a date and time.
4. When you are finished, click OK.