> -----Original Message----- > From: centos-bounces at centos.org > [mailto:centos-bounces at centos.org] On Behalf Of Devin Reade > Sent: Saturday, July 02, 2011 15:51 > To: CentOS mailing list > Subject: Re: [CentOS] Power-outage > > Ljubomir Ljubojevic <office at plnet.rs> wrote: > > > First is to have LAN power controller/switch, can't > remember how you > > call it. It can monitor several inputs like voltage, > on/off, etc, and > > it can be used to cut and restore power, as well as reboot. > They have > > web interface and are accessible via IP. Wireless network > guys use them. > > I do in fact use these (they're called managed power > distribution units, such as the APC AP7900), not only for > such manual operations but also because they're good for > doing fencing in HA clusters. > > However, that does not alter the fact that this solution > requires human intervention (albiet in this case you can do > it remotely). > It doesn't fix the flaw, it just works around it. Our dhcp server can run for many days on battery, it has a script running that if a machine does not ping, it sends a WOL. It does not do this if the network AC is off. If the AC is resored for more than 30 minutes, the script resumes. Machines wake up. > > It's also an additional expense that I don't think would be > in the OP's scope. > Also regarding DB taking too long to shut down, we use hibernation now. It is fast. -Jason -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - Jason Pyeron PD Inc. http://www.pdinc.us - - Principal Consultant 10 West 24th Street #100 - - +1 (443) 269-1555 x333 Baltimore, Maryland 21218 - - - -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- This message is copyright PD Inc, subject to license 20080407P00.