v.: 2020-09-04
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The redundancy behavior depends on the settings of Connections and Heartbeats:
For the redundancy behavior to work properly, two preconditions must be met:
1. Two valid IP addresses must be specified under Connections.
At least two IP addresses must be stored and allow inbound RCCMD commands.
Redundancy means, RCCMD should not shutdown the server until at least two transmitters have instructed to power down the
host.
2. The heartbeats must be set to "Automatic UPS alive check by polling"
RCCMD is instructed by the heartbeats to automatically check the availability of registered IP addresses:
Should a registered UPS become unreachable and the redundancy system shuts down, RCCMD will assume that there is a
serious problem and shut down the system ignoring the redundancy setting.
Note:
Keep in mind that the intervals between lookups can be crucial for a shutdown.
Note: The redundancy behavior refers exclusively to the RCCMD command shutdown
Other commands are handled individually and logged accordingly. With the ability to run your own scripts, RCCMD offers
options to bypass the standard procedures in case of an emergency.
Defining redundancy levels
First activate the RCCMD redundancy function.
Then select the IP addresses that are allowed to send a shutdown
signal.
The Redundancy Level is depending on the number of selected
devices:
Number of selected units X -1
By using two devices, both need to send an RCCMD shutdown
signal.
Since only two systems have been selected, only a maximum of
one additional system can send this command. Thereby it is not
important, which device is the first sender - this may change dynamically.
For 3 selected systems, the maximum value is 2:
If 1 unit + 2 other units instruct the shutdown, it will be executed. RCCMD does not differ which of the three systems sends the
first shutdown.
Using 3 systems, you can also change the Redundancy Level to 1:
As a consequence, two out of three systems are needed for RCCMD to shut down the server. The combination may change
dynamically. If you just want to pair 2 of 3 UPS systems, it is recommendable to select them and set the redundancy level to 1.
By doing so, the shut down will only be done if both selected UPS’s will send a shutdown command.
Keep in mind:
With redundance, you combine several devices. Under connections, you allow general incoming shut down signals. As a
consequence, it is possible to configure one redundancy shutdown as well as several single shutdown sender.
Note
Please keep in mind that a shutdown instruction remains active until the system which has instructed the shutdown explicitly
withdraws it. This is controlled via the RCCMD Custom Command wakeup.
Shutdown behavior with two UPS systems
In case of a shutdown signal, The redundancy will check
the connectivity and the availability of the second UPS
system are. If it answers properly, the shutdown signal will
be suppressed with reservation until further notice:
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