A single (hot-plug) PSU is obviously just one unit, and if that breaks the server turns off.

But when it comes to the Dual options there arer a few.
Plain "redundant", and "fully redundant", and also "fault tolerant redundant".

I could find a few articles t5alking about differences between FR and FTR, but they didnt mention the plain "redundant" dual PSU option.

Could someone give a simple explanation about the diff between "redundant" and "fully redundant".

Does plain "redundant" actually mean "hopefully redundant, depends on load"?