I wrote a blog post about this sort of thing the other day 
http://thelastpickle.com/2011/06/13/Down-For-Me/

Let me know if you spot any problems. 

Cheers

-----------------
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com

On 16 Jun 2011, at 02:20, AJ wrote:

> Thanks
> 
> On 6/15/2011 3:20 AM, Sylvain Lebresne wrote:
>> You can use the thrift call describe_ring(). It will returns a map
>> that associate to each range of the
>> ring who is a replica. Once any range has all it's endpoint
>> unavailable, that range of the data is unavailable.
>> 
>> --
>> Sylvain
>> 
> 

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