Vertica is a massively parallel processing (MPP) database designed to run across a cluster of similar nodes. These nodes should be identical. However, in some cases that is not possible. For example, if you expand a cluster that was originally purchased more than two years prior,the nodes are probably not identical. In that case, configure the new system with the same number of cores, at the same or faster speed, with the same amount of memory and disk space for each node.
When specifying hardware for your Vertica cluster, there are several important issues to take into account. To start, let's look at what hardware profiles work well for Vertica.
Learn more here: https://my.vertica.com/kb/Vertica-OEM-H ... -Guide.htm