RedHat8 boot problem with 2 scsi disks

Trying to get RedHat8.0 working in my test machine
Intel 815 PentIII with Qlogic QLA1080 scsi and 2 IMB DGHS sca type drives. It has worked fine with 7.3 - where I can dd from
one disk to another, and boot on /dev/sda without any worry about what might be on /dev/sdb.

I find what seems a bug in 8.0 that, when a drive with a linux partition is installed as /dev/sdb that the boot fails every time, just prior to mounting all the partitions read/write. If there is a secondary disk with a fat format, the boot will not fail. Is there a way to stop /dev/sdb from being mounted(or ???) at boot time?

Thanks in advance!

 

 

 

 

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