Best approach to replace existing 8 smaller 8 nodes in production cluster with New 8 nodes that are bigger in capacity without a downtime
We have 4 nodes each in 2 DC, and we want to replace these 8 nodes with new 8 nodes that are bigger in capacity in terms of RAM,CPU and Diskspace without a downtime. The RF is set to 3 currently, and we have 2 large tables with upto 70Million rows What would be the best approach to implement this - Add 1 New Node and Decomission 1 Old node at a time? - Add all New nodes to the cluster, and then decommission old nodes ? If we do this, can we still keep the RF=3 while we have 16 nodes at a point in the cluster before we start decommissioning? - How long do we wait in between adding a Node or decomissiing to ensure the process is complete before we proceed? - Any tool that we can use to monitor if the add/decomission node is done before we proceed to next Any other suggestion?