-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@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@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
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