If we select show all partitions it shows the SLES 12 SP5 partition but after the selection and press continue it gives /mnt/boot/efi mount failure.
How can we handle this? Thanks in advanced.
After some google searching it seems to me that the problem is related with the use of the HPE driver cciss that must be changed to hpsa in /etc/fstab before the upgrade.
I have scheduled for the next friday (11/06/2021) to make a new upgrade attempt and after the intervention i will post the result.
* HPE Proliant DL580 G9 + SLES 12 SP5 for SAP
Intervention in progress ...
Changing the file /etc/fstab from cciss to hpsa worked in conjunction to the change made to the GRUB menu, adding hpsa.hpsa_allow_any=1 parameter at ISO boot.
But now we face the following issue.
HPE Proliant DL580 G9
Offline Upgrade SLES 12 SP5 to 15 SP2 done successfully!
Note.: After the upgrade we had to reconfigure the name servers.
New discussion in the following link:
Offline Upgrade SLES 12 SP5 to 15 SP2 Fails (Solved)