Date: Tue, 25 May 1999 10:00:57 -0400 (EDT) From: Thomas David Rivers <rivers@dignus.com> To: freebsd-questions@freebsd.org, terry@program-products.co.uk Cc: rivers@dignus.com Subject: Re: console terminal server and power loss Message-ID: <199905251400.KAA05469@lakes.dignus.com> In-Reply-To: <eg14ltg8l.fsf@program-products.co.uk>
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> > > Hi Thomas, > > Thanks for the quick answer, > > > I may be wrong, but I thought a <break> on an RS/232 was a 25ms > > drop in the +5v line. When the power goes out, that will be the > > case... so, you get your break. There's not much you can do > > about that... > > That's what I suspected. Do you know which line the +5v is and wether > it is constantly +5. It sounds ugly but maybe I could hold it steady > with a small battery. > > > Why is it that the power goes out on your 386 and not on your sun? > > Can you "plug" the PC into the same power source as your Sun boxes? > > Then, the PC won't go down until the Suns do... > > They're both on an UPS but if the power supply on the PC fails then > I'm stuffed. I should have mentioned that I'd like to scale up the > solution to a dozen or so semi-critical boxes that I'd prefer not to > support overnight or at weekends. > > Cheers, > Terry. Personally, I've only had one power supply fail on a PC, and that's because a screw on the fan came loose, fell down, and shorted it out (what a smell.) But - it can certainly happen. You may be over-engineering though... Here's another question - can you configure the sun Boot proms not to drop into the monitor on a <break>? I'm not sure if you can or can't - and - if you did, how would you enter the monitor? (Maybe another character, like <cntrl>-@?) But - now that I think about it; I've got a Sun here who's console is a serial console connected to a FreeBSD box... I can turn the FreeBSD box on-and-off without affecting the Sun box... so, it must be doable somehow (this is an old Sun IPC which has the older boot monitor.) Maybe mine is set up in a nice way. You may want to look at the OpenBoot 2.x Command Reference Manual. I just tried it - I can kermit in to the box, and do a break; the machine drops into the monitor.... Something is going on, but I'm not sure what (maybe the Sun only "listens" to the break if CD is on?) Given that - have you tried just turning off the PC and seeing if the Sun machines actually drop into the monitor? - Dave Rivers - To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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