title: Does using different hardware specs for different nodes in cassandra cause problems?
body: <p>We started using Cassandra years ago with four nodes. All the nodes have same instance size, <code>M5.xlarge</code> which is <code>vCPU:4</code> and <code>Memory:16GB</code>. By time we increased disk space for each node up to 300 GB each. </p>
  
  <p>If we want to add a new node/nodes with different and higher hardware specs such as <code>vCPU 16, memory 64GB</code> (1 TB disk), does it cause problem across the nodes? It may sound silly but IOPS will be different, latency may be lower, even the data may be more up-to-date in higher spec node(maybe it chokes other nodes?). Since the traffic is distributed evenly the way new node handle the I/O will be different than other nodes.</p>
  
  <p>Thank you.</p>