PAPAGENO can be rendered fail-safe by a redundant configuration.
In order to achieve a high level of fail-safety, use the high-availability solution of an operating system. This ensures that a computer automatically takes over the work as soon as another fails. The data is also kept fail-safe, eg on a "double-ported RAID system.
Procedure: PAPAGENO is installed on two computers with the fail-safe system. One host accesses the PAPAGENO processes. If it fails, the same PAPAGENO installation is started from the other host. For this purpose, the high-availability solution of the operating system offers suitable tools.
The high availability solution may include two separated networks. Host A and host B are each connected to both networks. If one network fails the operation can proceed normally.
- Backend High Availability solution
- Simple Solution
Backend High Available Solution
In order to achieve a high degree of failure security for backend devices and to always have the desired number of channels available, the following configuration can be used:
n+1 communication servers are used.
n+1 means that one more server than necessary will be implemented for ordinary message transmission. If one server fails sufficient channels are still available.
A communication server is a computer with one or more fax cards (2 to 120 channels) and a PAPAGENO THETA server process.
Example: There is a need for 90 channels. Then 4 communication servers with 30 channels each are used. (All in all there are 120 channels). If a computer fails, the required 90 channels are still in use.
All communication servers are connected with both networks. If one network fails the services will continue without a break.
The communication servers are connected to different nodes of the telephone network. Thus, here too, reliability is guaranteed.
A more simple solution may include two identical PAPAGENO hosts, a RAID system or disk mirroring.