Experimental Physics and
Industrial Control System

Matt Bickley <[email protected]> · Fri, 04 Apr 1997 17:05:53 EST

The communications failure was between databases, not involving sequences.
In particular, the problem was in the task named "dbCaInput", which manages
database CA input links on the host IOC.  Another solution (which wasn't
widely known at the time of the failure Chip referred to) was to delete the
"dbCaInput" task and respawn it.  When the dbCaInput restart solution was
applied, roughly 20 of our IOCs had suffered the communications failure
simultaneously.

> Here's a typical problem at Jefferson Lab (taken from log):
> 
>  The global sequence on iocin1 claimed the signals from iocin3 and iocwa4
>  were monitored but not connected even though the iocs were indeed up and
>  the signals reachable by caget.  iocin3 and iocwa4 also were not providing
>  signals to iocin1.  The solution was to reboot iocin1 to force the se-
>  quence to re-establish connections to various viewer iocs. Rebooting the
>  data source (iocin3 or iocwa4) did not fix the problem.
> 
> Anyone have any suggestions for how to find or fix this?
> 
> Regards,
> 
> Chip

----
Matthew Bickley                                       Email: [email protected]
Computer Scientist                                   Voice mail: 804-249-7347
TJNAF

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System