I have a POS application which runs on several linux machines all on a
network. Everything has been good until this past weekend.
This system is in a building that has an internal network on 192.168.0. The
POS application was using this network for its connectivity to the database
server. This past weekend, I put these 6 terminals and the database server
on their own subnet which is 192.168.10, in anticipation of adding another
12 terminals. I thought this might be good for performance reasons. The
switch that these terminals and server are connected to is connected to a
linksys router which is in turn connected to the 192.168.0 network. Pretty
much, everything works as expected.
The other change I made, at the suggestion of my friend the Unix guru, was
to add "bg,rw,soft" to the NFS mount entry on each POS terminal (they mount
a file-system on the database server from which they read/write some data
to/from regular files).
But, ever since these changes, the POS application will sometimes
temporarily freeze up. After 1-2 minutes, it continues on as if nothing
wrong had happened. It looks to me like this occurs whenever the application
is accessing either the NFS-mounted disk or the database (which, of course,
uses the network).
I'm at a bit of a loss to understand why my changes would have this effect.
I'm going to go to the customer tonight and attach a debugger to one of the
application processes when it freezes up to see if I can narrow down a
little better where it hangs up. But even if it's hung up in some call
related to the network, I still don't know why doing what I did would have
this effect.
If anyone has any ideas I'm all eyes/ears. Thanks.
Bill
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