I've used mysql-mmm in the past as well, in production environments with 
2 masters and 4 slaves, where master database servers have gone down.  
It's not perfect, and won't guarantee 100% accuracy, but it does do its 
job fairly well.

Paul

On 11/04/2010 07:46 AM, Justin Lintz wrote:
> A co-worker recently setup http://mysql-mmm.org/ and it seems to be
> working as advertised.  We haven't had a production failure with it in
> place yet but testing failovers before it was deployed worked well.
>
> - Justin Lintz
>
>
>
> On Thu, Nov 4, 2010 at 1:27 PM, Christian Paredes<c...@redbluemagenta.com>  
> wrote:
>> Hey guys,
>>
>> I'm curious if anyone has implemented a solution for automatically
>> promoting a MySQL slave machine to be a master for an entire pool of
>> MySQL machines when the primary master goes down?
>>
>> I saw that lbpool (http://code.google.com/p/mysql-lbpool/) might do
>> what I want, but I wasn't sure if anyone has used this before, or if
>> anyone has implemented another way of doing this?
>>
>> Thanks guys,
>>
>> --
>> christian "ian" paredes
>> http://about.me/cparedes/bio
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