Arnaud Quette ha scritto: > [a quick walk through the ml, still from the UDS/Googleplex...] > > Hi Marco,
Hi Arnaud, good to read you! >> A digression about the fan: it's really annoying not just because it's >> louder than my 100W computer with 4 fans running (yes, it is), but also >> because there's no need to keep it spinning all the time in a *small*, >> *650* UPS generating just a *few* watts during normal use (measured with >> a watt-meter and both the metal cage and the exhaust air are indeed >> cold). Replacing it with a quieter fan, although fine for the UPS, means >> void warranty. I'd like to have a little more attention on this aspect, >> maybe using a thermoregulated fan, when paying 300 euro. >> But I should address these critics to MGE rather than the NUT mailing >> list, I know. However, beyond this issues, the UPS has proven to be a >> good product, good-looking too :) > > you've been heard ;-) > the point you might be missing is that the evolution range is a line > interactive one, but more for small servers. > and these are generally in some server rooms. > for something more SOHO focused (and so less noisy), you should have > opted out for Ellipse MAX (still line interactive, with 2 outlets > groups too) Well, I knew about the Ellipse MAX but I preferred the Evolution, which is pure sine wave. Beyond this you are right, but the basic idea is not to cool something that don't need to be cooled. For example the APC Smart-UPSs (really similar to the Evolution line, line-interactive, sine wave) 750VA and 1000VA are totally fanless. I'm sure that the Evolution 850 and 650 models can run fanless too, at least during normal use (9-12W don't require an always spinning fan or a fan at all). Moreover I suppose that nowadays low power UPSs are widespread in offices as much as in server rooms, expecially the tower versions. I can now ask you why the Evolution is using two different fan speed if it supposed to stay in a server room? And, about the heat, where is the difference, when not running on batteries, beetwen the Ellipse MAX and the Evolution, fan excluded? Why is the first one fanless while doing the same thing, with the same tecnology? ;) Now, let's stop thinking of the fan, I love my Evolution and I like your presence here. One more reason to prefer MGE. :) > can I possibly contact you next week, when I'm back to MGE, to get > some more feedback? Sure! > now about the Powershare, these are things that I should have done for > years... > but since I've taken over the project leadership, there are far too > many things I've not been able to give time to. > now, the situation has evolved since my Eaton'isation. I'll have more > and more time, and possibly somebody to work with me (but the crisis > might void this point in the short run though). (I know, in these weeks many projects are being delayed or stopped) I have a couple of questions for you. 1) It's not clear to me whether the UPS is going to reboot or not when mains is back again, if it has not been shutted down. Let's consider the VoIP phone example, if I drain as much as I can my batteries (with the deep discharge protection on) and the UPS is not shutted down by any computer before it stops, is it going to reboot when power is restored? I suppose it's not going to reboot in case the power is restored before the UPS is dead, right? 2) The NUT documentation states that, usually, the event triggering the computer(s) shutdown is the "low battery" state (or a timer when using upssched). Now I see in psp (for windows, since there is no psp amd64 for linux :P) that it is possible to call the system shutdown on the basis of (3) differen criteria. Moreover the "battery charge" criteria seems not to be related with the low battery precentage (the one activating the low battery alarm). Is this right? If so, why under NUT is the "low battery" state the only one setting/criteria triggering the system shutdown? It would be comfortable to start the power down procedure when a certain battery charge is reached (not necessarily the low battery percentage) or when there are still X seconds of runtime available. The good thing is that the same method can be applied to the switchable outles. For example I can set the UPS to cut the power on the outlet.1 when the batteries are at 55% and have NUT starting the shutdown procedure when the charge is lower than 70%. Or I can start the system shutdown at 70% and before halting set outlet.1.delay.shutdown. Unfortunately this require the system(s) to be aware of the outlet it(they) are using, and is going to complicate the NUT architecture, but such behaviour would make it *really* powerful! The "low battery" state can be still useful, to make systems shutdown as fast as they can, eventually calling the UPS shutdown too. Maybe it can be used as event for the last computer running, the one controlling the UPS, for example. However I don't know if this can be achived easly, but maybe it sound interesting and something can be done... just let me know your opinion! Many thanks for your attention and thanks for this chat. Regards, Marco _______________________________________________ Nut-upsuser mailing list [email protected] http://lists.alioth.debian.org/mailman/listinfo/nut-upsuser
