-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Alvin Starr wrote:
A lot of UPSs switch from the mains to battery once the power drops and that delay can be enough to cause some power supplies to lose enough power to fail
If that happens then your UPS is broken. The whole point of a UPS is to supply *uninterruptable* power. Even the simplest pass-through UPSes I know about can switch from line to battery in the space of a single waveform (ie. within 1/60th of a second). Not much point in having a UPS if it makes all your equipment reboot when the power goes out. - --Bob. - -- Bob Jonkman <bjonkman@sobac.com> Phone: +1-519-635-9413 SOBAC Microcomputer Services http://sobac.com/sobac/ Software --- Office & Business Automation --- Consulting GnuPG Fngrprnt:04F7 742B 8F54 C40A E115 26C2 B912 89B0 D2CC E5EA On 2016-06-14 11:30 AM, Alvin Starr via talk wrote:
On 06/14/2016 11:23 AM, Russell Reiter via talk wrote:
On 6/14/16, D. Hugh Redelmeier via talk <talk@gtalug.org> wrote:
We have a computer that started doing random and frequent restarts on the weekend. We don't know why.
Any suggestions? You don't mention whether or not the system is protected by UPS.
I live in an area with somewhat spotty electrical service, an older building near the exhibition grounds. When they liven up the CNE grounds in the spring, I experience brown-outs quite often.
Most recently the city has replaced the streetcar overhead wires and de-energized and re-energized the system, both times I had spontaneous reboots. One of the TTC engineers told me the new streetcars require more voltage and they are replacing the wires with heavier gauge ones throughout the city.
Are you near streetcar tracks where they may be replacing wiring or perhaps near one of the transformers which convert AC to DC?
As a note I have been burned by lower cost UPSs and heavily loaded servers with no hold time in the power supplies.
A lot of UPSs switch from the mains to battery once the power drops and that delay can be enough to cause some power supplies to lose enough power to fail.
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