Thanks, Ted.
This would solve power feed problem. Unfortunately we have similar 
situation with the switches. Failure of one will bring half of the 
servers down. It is understood that changing/adjusting hardware 
infrastructure can solve the problem. Unfortunately this is not under my 
control. So I am trying to explore possible options (I understand that 
there is no currently available solution out of the box) within existing 
conditions.

On 07/15/2010 01:56 PM, Ted Dunning wrote:
> A small rack mounted UPS doesn't require a full-scale rebuild of
> infrastructure and would get you through almost all power fail scenarios.
>   If you have 5 ZK servers, put 3 on one power source and give one of them
> the UPS.  Then give put the other 2 on the second power source.  If power
> source A fails, you keep 2+1 servers and if power source B fails, you keep
> 3.
>
> If you can stand manual intervention during an emergency, you might be able
> to devise a recovery scenario.  You can put 3 and 2 on A and B as above
> without a UPS.  If B fails, you are fine.  If A fails, you can go in and
> reconfigure the remaining nodes to only consider themselves as the quorum.
>   This is not a good plan in general because ZK is reliable enough that
> people forget about it.  That means it won't be top of mind in a disaster
> response.
>
> On Thu, Jul 15, 2010 at 10:30 AM, Sergei Babovich
> <sbabovich@demandware.com>wrote:
>
>    
>> Three power sources obviously would solve the problem. Unfortunately at
>> this moment it does not seem to be feasible (we will need to rebuild the
>> whole existing infrastructure).
>>      

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