New answers tagged server-farm
You don't necessarily need to stop it unless you want SharePoint not to treat it like a WFE. It is that service (Microsoft SharePoint Foundation Web Application service) being enabled on the APP server that is causing SharePoint to propagate your new web application settings to IIS on the APP server though.
The advice from Waqas is good, I also like to have a "Data" drive (where I store site collection backups, and other exports). This allows me to have a backup drive that is different from the Logs and the OS drive.
For SQL Server: 1) 1 for OS(80GB), 1 for data files( size depend upon your data), 1 for log files For WFE/App Server: 1) 1 for OS( 80GB) , 1 For the ULS Logs & IIS Logs ( because Logs chew all the space sometime, when enable the verbose and have operation going on),
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