Oracle Acme Packet 6100 Hardware Installation Manual page 70

Caution
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Once you have determined that the Acme Packet 6100 due for maintenance is
in standby mode, you can continue with the appropriate procedures to replace
a part.
If you need to perform maintenance on the active Acme Packet 6100 you need
to manually force the two Acme Packet 6100s to switch HA states. Forcing a
switchover renders the currently active Acme Packet 6100 standby, and the
currently standby Acme Packet 6100 will assume all traffic processing and
forwarding as the active system.
This procedure is only applicable to Acme Packet 6100 in an
HA deployment.
To force a Acme Packet 6100 into the standby HA state:
1. Confirm that the relevant systems on active and standby Acme Packet 6100
are synchronized with the show health command. Type show health and
press <Enter> on each system.
Acme Packet 6100 Hardware Installation Guide