Experimental Physics and
Industrial Control System

Carl Lionberger <[email protected]> · Fri, 28 Mar 97 09:29:53 -0800

Hello,

I think Stephanie is talking about the bumpless restart facility that we have
developed at LBNL, which I presented at the EPICS consortium meeting last 
September.   We'll add the rebootHook facility as suggested by Jeff.

	Carl

//
// Carl Lionberger				[email protected]
// Computer System Engineer			Voice 	(510) 486-7503
// Berkeley National Laboratory			Fax 	(510) 486-4047
//

> Hello all,
> 
> > From: [email protected]
> > To: [email protected]
> > Cc: [email protected]
> > Subject: Rebooting an IOC
> > Date: Wednesday, March 26, 1997 2:39 PM
> > 
> > I'd like to add a "reboot" button for each IOC on one of my 
> > lower-level, system EPICS displays.  My first thought was to have
> > the button initiate processing of a subroutine record that simply 
> > calls reboot().  But I'd like the reboot to happen when the IOC
> > is "quiet", in particular, when there are no files being written
> > by the save-restore tasks (the tasks that save user-enterable channels 
> > that need to be restored during bootup time for a bumpless reboot).  
> > Now, I realize that this is a luxury I don't get when the IOC crashes 
> > or when somebody powers the crate down but, happily, these events don't
> > happen very often.  
> 
> You can register a C function with vxWorks to be called by vxWorks 
> before it reboots. This "reboot hook" could be used to postpone the reboot
> until 
> after the save restore system has been flushed to disk. There are
> many examples of this sort of thing in the EPICS drivers (where
> interrupts are turned off and devices are otherwise placed in a safe
> state prior to rebooting).
> 
> At APS they used specialized hardware to provide remote access to the VME
> system reset via a terminal server (via a special character sequence
> recognized by this hardware).
> 
> Jeff
> 
> ______________________________________________________
> Jeffrey O. Hill           Internet     [email protected]
> LANL MS H820              Voice        505 665 1831
> Los Alamos NM 87545 USA   FAX          505 665 5107
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System