Types of IPL ( Initial Program Load ) in z/OS Mainframe

1) Cold Start

Any IPL that loads or reloads the PLPA and does not preserve the VIO data sets.
The first IPL after system installation is always a cold start because the PLPA is initially loaded.

Note - IPL with CLPA option.

2) Quick Start

Any IPL that does not reload the PLPA and does not preserve the VIO data sets.

Nore - IPL with CVIO option.

3) Warm Start

Any IPL that does not reload the PLPA and preserve the jourhaled VIO datasets.

Note - Don't specify CLPA or CV