Marcy,  thank you for pointing that out.  I have that in my documentation since 
SLES12 also but when I checked, I noticed that for the server I upgraded from 
12 to 15, this option was commented out!  I also add 
SUSE_REMOVE_LINUX_ROOT_PARAM="true" but this option was still there.  So it 
turns out that this entire thing could be avoided by the 
GRUB_DISABLE_LINUX_UUID=true.  I point to my root device via the root= kernel 
option and point to the device number by-path.  Thank you for reminding me to 
look for this option.  Don't know how it got commented out or perhaps it was 
never uncommented. 

Thanks again,
Aria



-----Original Message-----
From: Linux on 390 Port <LINUX-390@VM.MARIST.EDU> On Behalf Of Marcy Cortes
Sent: Wednesday, October 13, 2021 6:36 PM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: Warning if upgrading SLES12 to SLES15 SP3

Aria, I've had in our build stuff since the sles 12 days to put this in 
/etc/default/grub
GRUB_DISABLE_LINUX_UUID=true

I think that might help your boot duplicate issues? 
My brain cells that contained why I did that seem to have been reused for 
another purpose though, so maybe it was something else.  I know it had to do 
with clones. 

Marcy

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