HP Software File Migration Agent Installation and Administration Guide (September 2009)

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Failure monitoring and failover
Failover is the process in which a target stands in for a failed source. As a result, user and application
requests that are directed to the failed source are routed to the target. Storage Mirroring monitors the source
status by tracking network requests and responses exchanged between the source and target. When a
monitored source misses a user-defined number of requests, Storage Mirroring assumes that the server has
failed. Storage Mirroring then prompts the network administrator to initiate failover, or, if configured, it
occurs automatically.
HP Storage Mirroring provides different options to the users during failover configuration. These options
include failing over the following items:
• IP address
• Hostname
• Shares (resources)
Depending on which options are selected, the user is limited to certain configurations. If the user decides to
create a full failover including IP address, Hostname, and Shares, the user is limited to only a one-way
mirroring and replication (active source/passive target) configuration. If the user wanted a two-way
mirroring and replication, only the share resources can be selected during failover configuration.
WARNING Failover IP address and Hostname in an active source/active target configuration causes data
loss on one of the servers. Follow the configuration instructions carefully when configuring
an active/active configuration.
In the event of a failover, a script must be run to activate all the file stubs located in the volume(s) of the
target server.
Restoration
Restoration provides a method for copying replicated data from the target back to its original location on the
source. When using HP Storage Mirroring with HP File Migration Agent, you have the ability to restore files
and file stubs back to the original managed volume. When using this feature, an extra step is required to fully
restore a file stub(s). Run the FMACLI command fmacli act on the file stub(s) before recalling the file(s).
For example, if file stubs were restored on letter drive D:\ on the source server.
a. Open up a command prompt on the source server.
b. Run fmacli act –r D: to reactive the file stubs.
If this command is not executed, an error occurs when attempting to recall the files.