Cluster Deployment 22 Selecting Hardware 22 Memory 22 CPU 22 Disk 23 Network 23 Planning an Amazon EC2 Cluster 23 Capacity Planning 24 Calculating Usable Disk Capacity 24 Calculating User Data Size 24 Cluster on Amazon EC2 Using the DataStax AMI 32 Creating an EC2 Security Group for DataStax Community Edition 33 Launching the DataStax Community AMI 34 Connecting to Your Cassandra EC2 Instance 35 Configuring default value is fine for most situations, but DataStax recommends increasing it to 12 for Amazon EC2 due to the network congestion frequently experienced on that platform. Node failures can result from