[CentOS] Power-outage

[Jason Pyeron]

> -----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 

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