HP Storage Mirroring Software - Manual (Page 660)

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failover, the target will be rebooted automatically. After the reboot, the target will no
longer exist, since it will become the source.
Note: Because the Windows product activation is dependent on hardware, you
may need to reactivate your Windows registration after failover. Follow the
on-screen prompts to complete the reactivation.
After your target has failed over and becomes your source, you can stay with that
configuration long term. However, in some instances, it may be necessary or desired to
go back to using the original hardware after you have failed over.