AIX 3 looses serial ports
Kevin P. Kleinfelter
kevin at msa3b.UUCP
Thu Jan 10 01:46:52 AEST 1991
YAASPP - Yet Another Aix Serial Port Problem
Our 6000 "looses" serial ports. We have 32 modems on the 64 port adapter.
Once the system decides there is a problem with a port, it will write to
it, but reads always act as if there is no data incoming.
For example, if we enable a port with a "smart" modem in echo mode,
AIX sends "login:" and the modem echos "login:" and AIX sends
"password:" and the modem echos "password" ad nauseum. AIX cleverly
assumes that there is a problem with the port, and apparently marks it
as faulty. From that point forward, all input from the port is
ignored. The only fix I have found is to reboot.
Deleting and recreating the /dev/tty? does not fix the problem.
Killing the getty does not fix the problem.
Pdisable and penable does not fix the problem.
Note that the example I gave above is only one way to get AIX to
deactivate the port. All of my modems are now programmed to not echo,
and I still loose occasional ports.
Two questions:
1. How can I reactivate the port without a reboot once the problem is fixed?
2. Other than my example above, what would make AIX tag the port as bad?
--
Kevin Kleinfelter @ Dun and Bradstreet Software, Inc (404) 239-2347
{emory,gatech}!nanovx!msa3b!kevin
Soon to become {emory,gatech}!nanovx!dbses0!kevin (But not yet!)
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