Experimental Physics and
Industrial Control System

"Jeff Hill" <[email protected]> · Thu, 5 Jun 2003 15:31:49 -0600

There were definitely some bugs found and fixed in the software (LAN)
synchronized time support since 3.13.beta11, but I don't remember any 6 hour
errors being fixed.

However, you are probably using the Bancom GPS synched hardware time source, and
the problem might be there? Perhaps you should check with KECK to see if they
have fixed any problems in the Bancom driver?

If this IOC does not have a specialized time source then another possibility
might be that it is fetching the starting time and date from the boot host (or
some other host specified by the configuration) and the time and date error
originates from there.

A less likely possibility might be that the IOC has been running for a long
time, its time isn't LAN or hardware synchronized, and the local tick based time
has drifted 6 hours off of correct time. 

Jeff

> -----Original Message-----
> From: Bill Cruise [mailto:[email protected]]
> Sent: Thursday, June 05, 2003 3:11 PM
> To: [email protected]
> Subject: time init problem
> 
> We have recently started seeing a seemingly random 6 hour jump in
> the EPICS system time at boot up.  EPICS_TS_MIN_WEST is set to 0,
> and I am not logging it on each boot and it isn't changing.  Does
> anyone have a good place to start looking for this one?
> 
> We are running R3.13.0, beta 11, in case there are major changes
> in this area.
> 
> --
> 
> William L. Cruise                             [email protected]
> Electronics System Supervisor                   FAX:    808 885-7288
> Canada-France-Hawaii Telescope                  Voice:  808 885-3121
> 65-1238 Mamalahoa Highway         http://www.cfht.hawaii.edu/~cruise
> Kamuela, HI   96743

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System