On Sat, Aug 15, 2009 at 7:26 AM, Amos Shapira <amos.shap...@gmail.com>wrote:
> 2009/8/14 Micha Silver <mi...@arava.co.il>: > > shimi wrote: > >> Sample the UPS unit for "how much battery time left do you have?" and > >> initiate automatic shutdown when the number falls below the 5 minutes > >> threshold ? > >> > > Yes, that's probably best. Thanks. The disadvantage is that after the > power > > comes back, someone has to physically go to power-up the servers. > > Well, that's how UPS's are supposed to be used. > > In addition to Wake-On-Lan mentioned by Shimi, there are also: > 1. Boot on AC power - i.e. if the AC power comes back then start > reboot. That's a BIOS setting. Which assumes a power loss after the automatic shutdown. According to Murphy law, and to my experience, power tends to return 1 minute before the battery gets completely drained, just for me to wonder "why oh why did I shut down my whole server room, it would have survived". Of course that if I wouldn't have shut down everything, the outage would be 1 minute longer. :) So still need WoL :) (to be initiated by the machine sampling for the UPS remaining battery after the battery managed to re-charge for additional few minutes of backup power - enough for a second power up and shutdown of everything assuming a second outage...) -- Shimi
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