My problem is that one drive comes up almost instantly and the other
takes 30 seconds. In fact I can live with that. My real gripe is that
the kernel makes me wait even though the drive is not being accessed.
If it just wants to make the drive available, it should be able to wait
asynchronously.
Keep the hardware config the same, but boot a Fedora Live image (from USB stick or whatever). Does it still hang during boot?
The kernel shouldn't wait unless the device has put some kind of busy state on the bus shared by sysroot.
I'm suspicious that something is trying to mount it, or otherwise access it, but I haven't seen the logs.
Chris Murphy