Date: Wed, 27 Aug 1997 11:16:33 -0700 (PDT) From: Simon Shapiro <Shimon@i-Connect.Net> To: pechter@lakewood.com Cc: hackers@freebsd.org Subject: Re: ? power outages and file system corruption Message-ID: <XFMail.970827111633.Shimon@i-Connect.Net> In-Reply-To: <199708271205.IAA00522@i4got.lakewood.com>
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Hi Bill Pechter; On 27-Aug-97 you wrote: ... > Nah, time of day clock battery backup was standard on 11/780's > Memory battery backup was an option on both. Neither one were nvram. > Neither one avoided disk checks on power fail (VMS mount verification). > The batteries needed to be checked occasionally and replaced if they > were bad. Ah, so technology yet advanced :-) We had a battery and now it is gone. You are probably right about it being an option. More proof things are still the same. > > VAX/VMS, however did great powerfail recovery. I dropped the power to > an > entire computer room at Fort Monmouth as a test. > > The 6 RP06's and 2 RM05's spun down, the cpu fans went quiet. The > VT100's > froze and blinked out. I waited 5 minutes and flipped the main circuit > breaker on. The machine reloaded the console firmware, checked the > memory > status, and resumed execution of empire (or some other game which was > the > VAX/VMS rogue equivalent on all terminals) at the next move. I had this excercise done on production units twice. Once by a truck which backed up into a 6Kv line dropping it to the ground. Another by a fire in an ajacent wherehouse. > Unix would do the same thing based on the memory register status being > ok. Would maybe. System V rlelease from the Labs did not. Niether did BSD, or we will have this code in FreeBSD. No? You are right of course about RSTS. That was on PDP-11, which had a battery support for main memory too, I think. Had great lead bars at the bottom of the cabinet too. I melted down the last one about a year ago. Simon
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