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<== Date ==> <== Thread ==>

Subject: channel access reboot behavior
From: "Brian McAllister" <brian@hotrats.mit.edu>
To: tech-talk@aps.anl.gov
Cc: brian@hotrats.mit.edu
Date: Fri, 11 Jan 2002 18:58:51 -0500
As currently implemented, Channel Access on the IOC tries to communicate
with remote clients/servers when shutting down prior to reboot (this is
inferred from error messages seen during the shutdown).  Unfortunately,
network services will always have been shut down first, so these
notification attempts always fail, and will continue to do so unless the
VxWorks reboot processing is modified to allow user hooks to be handled
first, which seems unlikely.

Occasionally, one of our IOCs will hang on reboot, requiring physical
access to push the reset button.  I am wondering if this hang might in part
be due to the system trying to do things while in a partially shut down
state, and if there is any reason not to eliminate the CA server behavior
noted above, on the chance that it may be contributing to the problem.

Or perhaps, EPICS could have a "shutdown" routine, which terminates the
EPICS tasks appropriately, and then calls reboot ?

----
Brian McAllister                    Controls Programmer/Beam Physicist
mcallister@mit.edu                        MIT-Bates Linear Accelerator
(617) 253-9537                                           Middleton, MA


Replies:
RE: channel access reboot behavior Jeff Hill
Re: channel access reboot behavior Paul Sichta

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