Comment 3 for bug 1899477

Yes Michael you are reading correctly, that is exactly what I tried and what happened.

I agree in "general" that "read the phys block size and prevent that config" would be a good start.

But Dasd's in there have a special twist as they don't really have blocks anyway (they have tracks and records), so with a dasdfmt call you can essentially "change" the physical block size (there is a net-size vs granularity tradeoff but anyway I have shown above that it can work).