Comment # 7 on bug 1161331 from NANDA KISHORE

(In reply to Ancor Gonzalez Sosa from comment #6)
> (In reply to Ancor Gonzalez Sosa from comment #3)
> > 
> > So my question is: do my explanations fit your expectations about how the
> > proposal should work on top of "virtual disks"?
> 
> Setting the needinfo on Shivani Changela and Nanda Kishore again, for them
> to reply to my questions about expectations and booting from software RAIDs.
> 
> Talking about expectations, let me clarify two points.
> 
> First, in the logs attached by Shivani Changela I can see these systems use
> EFI to boot. So everytime I say "partition of type bios_boot" in comment#3 I
> should had actually said "an ESP (EFI) partition". All other considerations
> stay exactly as they are.
> 
> That being said, in the mentioned logs uploaded by Shivani Changela I can
> see this:
> 
> A disk "/dev/sda" with a total size of 220 GiB and GPT partition table
>   It contains a single "/dev/sda1" partition of 100 GiB
> 
> A disk "/dev/sdb" with a total size of 910 GiB and GPT partition table
>   It contains no partitions
> 
> A disk "/dev/sdc" with a total size of 440 GiB and GPT partition table
>   It contains a single "/dev/sdc1" partition of 100 GiB
> 
> A disk "/dev/sdd" fully empty (not even partition table) 
> 
> A software RAID1 called "/dev/md/VirtualDisk01" formed by sda1 and sdc1
>   It contains a GPT partition table with:
>     - An ESP (EFI) partition
>     - Two Linux partitions formatted with XFS
>     - A swap partition
> 
> According to what I explained in comment#3, we (the YaST Team) wouldn't
> expect such system to be able to boot, since there is no ESP partition
> allocated in any real disk. The only ESP partition is inside a software RAID
> that is backed by partitions.
> 
> So my question here is: does such system boot? So far, we had no evidence of
> S130/S140 controllers being able to boot from a software RAID if the needed
> partitions were not present in real physical disks. If you can prove that
> works, we would need to reconsider how the proposal works in those cases.

Ancor, 
till date, S130/S140/S150 was always working by booting from RAID1 ESP.

On SLES15-SP1 is automatically creating ESP on the MDRAID Partition unlike the
way you have mentioned in Comment #3 i.e. ESP should be on a physical
drive/partition.

Attaching the supporting logs from SLES15-SP1 installation(since SP2 we have
infinite loop bug):y2logs, suggested paritioning screenshot, post os boot logs.