mds@iddth.id.dk (Impedantzer (EMP)) (04/11/91)
I am posting this request for help/inspiration on behalf of a friend of mine with no connection to the network community. He is working in a company where they use a HP 375 Unix box for datalogging. It is vital that the machine is shut down in a controlled manner (i.e. closing all open files, etc.) in case of a powerfailure. For that reason they have an UPS powersupply capable of keeping til machine going fore an hour or so. Well, so much for the background story. Here comes the interesting part: they have the UPS but they *don't* have the daemon to shut down the machine. Are there anybody out there with a similar system willing to share his/her knowledge with my friend? Perhaps a sample program og something like that. The general idea is that the daemon reacts on an interrupt from the UPS. -- Michael PS. We don't have a system like the above mentioned here at the Dep. of CS, so when the power goes it's gone!! _________________________________________________________________________ Michael Dantzer-Sorensen e-mail: mds@id.dth.dk Department of Computer Science Tel. +45 45 93 12 22 ext. 3761 Building 344 & 345 Fax. +45 42 88 45 30 Technical University of Denmark DK-2800 Lyngby _________________________________________________________________________
ostroff@Oswego.EDU (Boyd Ostroff) (04/12/91)
In article <mds.671373695@iddth2> mds@iddth.id.dk (Impedantzer (EMP)) writes: > He is working in >a company where they use a HP 375 Unix box for datalogging. It is >vital that the machine is shut down in a controlled manner (i.e. closing >all open files, etc.) in case of a powerfailure. >Here comes the interesting part: they have the UPS but they *don't* have >the daemon to shut down the machine. Sure, see the recently posted "upsd" program in comp.sources.misc; it does exactly what you want! Also, you might look up the "Wizard's Grabbag" article entitled "Graceful UPS Shutdowns and Calendar Cleanup" on page 119 of the February 1990 issue of UNIX WORLD Magazine. It details a very simple hardware project which can provide a power failure signal for the garden-variety (eg: cheap) UPS and also the software needed to monitor it. By combining the information in this article and the upsd program from comp.sources.misc, anyone should be able to implement a very nice system like this for a modest cost. I plan to (when I get the time.... :-) |||| Boyd Ostroff / Tech Director / SUNY Oswego Dept of Theatre / 315-341-2987 |||| Sys Admin at cboard.UUCP / Serving the Performing Arts / 315-947-6414/8N1 |||| ostroff@oswego.oswego.edu / cboard!ostroff@natasha.oswego.edu
art@pilikia.pegasus.com (Art Neilson) (04/13/91)
In article <mds.671373695@iddth2> mds@iddth.id.dk (Impedantzer (EMP)) writes: >Here comes the interesting part: they have the UPS but they *don't* have >the daemon to shut down the machine. Are there anybody out there >with a similar system willing to share his/her knowledge with my >friend? Perhaps a sample program og something like that. The general idea >is that the daemon reacts on an interrupt from the UPS. I recently wrote and posted such a daemon to comp.sources.misc. It is written for system 5, if you are on a BSD system you'd have to hack it a bit. My UPS has a serial port and I've cabled it to a tty on my UNIX box. It raises DCD when it goes on battery backup power, and it drops DCD when it goes back to online power. That's enough to build a daemon around. You need to find out how your UPS signals power loss and power restored in order to write a daemon. Send me email if you have any questions regarding the daemon I wrote. -- Arthur W. Neilson III | INET: art@pilikia.pegasus.com Bank of Hawaii Tech Support | UUCP: uunet!ucsd!nosc!pilikia!art
lars@iclswe.icl.se (Lars Tunkrans) (04/13/91)
mds@iddth.id.dk (Impedantzer (EMP)) writes: >Here comes the interesting part: they have the UPS but they *don't* have >the daemon to shut down the machine. Are there anybody out there >with a similar system willing to share his/her knowledge with my >friend? Perhaps a sample program og something like that. The general idea >is that the daemon reacts on an interrupt from the UPS. What you need is contained in the February 1990 issue of UNIXWORLD, the Wizards grabbag column. Listings of the programs therein is available at uunet. path is uunet!~/unix-world/grabbag/1990/feb90.Z I dont have this sources on line but can fax to you if absolutley nessesary ( Denmark is not to far away from here ). Lars. -- Lars Tunkrans Phone +46 (0)76096368. | I C L DRS Systems Support. | UUCP: uunet!mcsun!sunic!iclswe!lars | The leading UNIX System V Release 4.0 DOMAIN Address : lars@iclswe.icl.se | integrator.