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From aaron morton <aa...@thelastpickle.com>
Subject Re: ebs or ephemeral
Date Mon, 10 Oct 2011 07:23:33 GMT
6 nodes and RF3 will mean you can handle between 1 and 2 failed nodes. 

see http://thelastpickle.com/2011/06/13/Down-For-Me/
Cheers

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

On 7/10/2011, at 9:37 PM, Madalina Matei wrote:

> Hi Aaron,
>  
> For a 6 nodes cluster, what RF can we use in order to support 2 failed nodes?
> From the article that you sent i understood "avoid EMS" and use ephemeral. am i missing
anything?
>  
> Thank you so much for your help,
> Madaina
> On Fri, Oct 7, 2011 at 9:15 AM, aaron morton <aaron@thelastpickle.com> wrote:
> Data Stax have pre build AMI's here http://www.datastax.com/dev/blog/setting-up-a-cassandra-cluster-with-the-datastax-ami

> 
> And an explanation of why we normally avoid ephemeral. 
> 
> Also, I would go with 6 nodes. You will then be able to handle up to 2 failed nodes.

> 
> Hope that helps. 
> 
> -----------------
> Aaron Morton
> Freelance Cassandra Developer
> @aaronmorton
> http://www.thelastpickle.com
> 
> On 7/10/2011, at 9:11 PM, Yi Yang wrote:
> 
>> Obviously ephemeral. It has higher IO availability, will not affect your Ethernet
IO performance, and it is free (included in instance price)
>> and the redundancy is provided by cassandra itself.
>> 從我的 BlackBerry® 無線裝置
>> 
>> From: Madalina Matei <madalinaimatei@gmail.com>
>> Date: Fri, 7 Oct 2011 09:02:06 +0100
>> To: <user@cassandra.apache.org>
>> ReplyTo: user@cassandra.apache.org
>> Subject: ebs or ephemeral
>> 
>> Hi,
>> 
>>  I'm looking to deploy a 5 nodes cluster in EC2 with RF3 and QUORUM CL.
>> 
>>  Could you please advice me on EBS vs ephemeral storage ?
>> 
>> Cheers,
>> Madalina
> 
> 


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