Question: What is Horizontal and Vertical Clustering ?
Answer: There are two method of clustering Horizontal and Vertical.
Horizontal clustering :
involves running multiple Java application servers that are run on two or more separate physical machines. Horizontal scaling is more reliable than vertical scaling, since there are multiple machines involved in the cluster environment, as compared to only one machine.
(What is Horizontal and Vertical Clustering)
however, consists of multiple java applications servers on a single physical machine. (What is JMS and How Do You Configure it)
with vertical scaling, the machine’s processing power, cpu usage, JVM heap memory configurations are the main factors in deciding how many servers instances should be run on one machine. (company)