I've recently upgraded (RHEL 6.5 to 7.5) a couple of servers and have noticed a peculiarity during the GUI build of the boxes.
This can be best explained as follows;
There were four Oracle ASM disks on each of these servers, these were selected in the GUI for reformat as XFS file systems as the extract fro the anaconda kick start file shows as follows;
Code:
[root@xxxxxxxxxxx ~]# cat anaconda-ks.cfg | grep ASM
part /ASM4 --fstype="xfs" --ondisk=sda --size=1023
part /ASM3 --fstype="xfs" --ondisk=sda --size=20479
part /ASM2 --fstype="xfs" --ondisk=sda --size=51199
part /ASM1 --fstype="xfs" --ondisk=sda --size=307200
[root@xxxxxxxxxxx~]#
All I did post build was to remove from the /etc/fstab file and unmount the directories.
However the Oracle team came back to me on both occasions and advised that they could still see the old ASM config on the disks.
Could it be that the mount points on your root FS were populated with files so when you unmounted the disks the files under /ASM* in the root FS became visible.
No, all the other slices of the disk were cleared and re-created. The upgrade process from RHEL 6.X to RHEL 7.X is destructive and is effectively a new installation - the rest of the disk entries from the kick start file are.
I'm guessing that this is some kind of problem with the installer, where if you match an existing partition exactly the format fails - even if you select the format option.
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