A process failure occurs when a single process on a server fails. If this occurs on a primary server, the recovery method depends on which process failed.
If the Alarm Manager or User
Registration on the primary server fails, control automatically
passes the corresponding process on the secondary server. If the
process on the primary server is restarted (via cpc), control will
automatically pass back to the process on the primary server.
If a device communications process
on the primary server fails, control will not pass to the
corresponding process on the secondary server, and point data will
be lost.
If the Point Manager on the
primary server fails, control automatically passes to the Point
Manager on the secondary server.
To recover from process failure in automatic
redundancy:
Click Project on the Workbench menu bar.
Select Stop to shut down the project on the primary server.
Select Run to restart it.
After the project is up and running, reset the primary server to be the master.
To circumvent limitations
of process failure in automatic redundancy:
Use either of two manual redundancy functions to anticipate and deal with this possibility.
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Failure exceptions for automatic Server redundancy. |
