cf scale myApp –i 5 is for horizontal scaling,
cf scale myApp -k 512M is for vertical scaling.
What happens when we use the above horizontal and vertical scaling commands? Do they increase the number of instances by adding 5 and Disk Size by adding 512M, or will the overall application instances be 5 and overall disk size be 512M?
-i, -k, and -m all take the new absolute values not an increment.
https://docs.cloudfoundry.org/devguide/deploy-apps/cf-scale.html
Use cf scale APP -i INSTANCES to horizontally scale your application. Cloud Foundry will increase or decrease the number of instances of your application to match INSTANCES.