title: Migration of Cassandra DB cluster from AWS to Azure
body: <p>We have one requirement to migrate Cassandra DB Cluster sitting over CentOS 6.5 from AWS to Azure. It is 4 node cluster with approx 3TB of data.</p>
  
  <p>So how to meet this requirement?</p>
  
  <p>We explored several methods mentioned below:</p>
  
  <ol>
  <li><em>Cassandra Replication</em>:  We created VPN tunnel b/w AWS and Azure and tried Cassandra Replication. // Failed.</li>
  <li><em>ASR</em>: We tried ASR for the migration, getting error :" <em>The data size for physical or virtual machine should be less than or equal to 1023 GB</em> ". ErrorID: 539.</li>
  <li><em>AMI to VHD conversion</em>: We are not able to find a way to convert AWS Linux AMI to Azure supported VHD.</li>
  </ol>
  
  <p>No matter which method we choose, we are looking for a feasible solution for this.</p>
  
  <p>Expect your reply.</p>