| Problems can occur if you are using a
Network File server (which you are most likely are with a LAN) and
you have Citect and other applications installed on the file
server. When a network fails Citect will switch across to the
second network. If the second network is also failed then Citect
will just keep retyring until one of the networks is available.
The connection to the network file server must also do the same
change over as Citect. When the primary LAN is failed the Microsoft
file redirector will time out the next time you try to access any
data on the file server. The redirector will then try to
re-establish communication to the file server by trying all network
adaptors. This can take up to 1 minute to occur and during this
time it may appear that applications have hung. During this time it
may fail file service requests to any application. Citect is
designed to handle this failure, however other applications may
fail. Also if the application is installed on the file server it
may cause the application to crash with a General Protection Fault
(GPF) see Q1885 for details.
If you are using LAN redundancy you should try to install as
much data as possible on the local hard disk. So that this data is
always available in case of network failure. I would recommned you
install Citect applications and other 3rd party applications on the
local hard disk. You do not have to install the Citect project on
the local hard disk as Citect can access the project over either
network adapator. Moving the Citect project to the local hard disk
will allow Citect to keep displaying new pages if both LAN fail,
however it does require more maintance to make changes to your
project.
See also Q1378, Q1195 and Q1121.
|
