> When I do a 'shutdown -r now' on my P90 PCI with two scsi-disks and an
> MFS mounted /tmp, it fails to get past the message "Syncing disks"

I get that sometimes too, on both all-SCSI and all-IDE systems,
especially when changing kernels.  Rebooting with just "reboot" seems
to be more reliable.

> I remember that some time ago people had recognised that mounting
> mfs could cause this.

But it happened back when I didn't have MFS /tmp too.