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 <madalinaima...@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
