On Wed, August 11, 2010 1:18 pm, Ryan Coleman wrote: > On Aug 11, 2010, at 3:06 PM, David Brodbeck wrote: > >> On Wed, August 11, 2010 12:25 pm, Ryan Coleman wrote: >>> He thinks that at 500W needed it would give me about 12 minutes on a >>> 1400VA. My consideration is, then, give the server 2 minutes on >>> battery. >>> If full power has not been returned, shut down the server but leave the >>> modem (w/ wireless) and switch running with power for up to 6 hours. >> >> A bit of advice: If this is an unattended system, give some thought to >> how >> you will boot the server back up if the outage is longer than two >> minutes >> but shorter than six hours. Most UPS installations have *some* kind of >> race condition issue if power comes back after the servers have begun a >> shutdown, but in your case it's an unusually long window. > > Meaning that my 2-minute window is unusually long? If the UPS can support > the system for 12 minutes, I say give it 20% of the life of the support > because our power outages here are usually spikes that kill my current web > server (but amazingly *not* my file server). In fact, one of those power > fluxes occurred last night. I love storms for the light shows, but hate > them for the toll they take on my servers.
Nope, 2 minutes is fine, maybe even short depending on how long your system takes to shut down. What I'm asking about is this scenario: 1. Power goes out. 2. Server shuts itself down after 2 minutes. 3. Power comes back on before the UPS batteries are exhausted. The server never sees a power cycle, so it doesn't boot itself back up until someone physically goes and pushes the button. _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"