[Bug 1315344] Re: Grub install failed on disks with software RAID

[ChristianEhrhardt]

Hi,
I wondered about this as there are docs about it and it is not like "everybody complains".
Docs:
- https://help.ubuntu.com/lts/serverguide/advanced-installation.html
- https://help.ubuntu.com/community/Installation/SoftwareRAID

I tested that with a virtual guest for that I set up 3x20GB Disks.
I wanted to configure them the following way:
Partitions on Each
p1 = 1G
p2 = 19G

The small ones for boot on raid 1 (remember boot can only be raid 1, not 5,6,...) as outlined in the links above.
disk1p1 - raid 1 boot
disk2p1 - raid 1 boot
disk3p1 - swap
The bigger part in a raid 5
disk1p2 - raid 5 /
disk2p2 - raid 5 /
disk3p2 - raid 5 /

Following the guides linked above with the described target in mind (to
prove that not only the most default setup works) I ended up in the
installer with this view:

RAID1 device #0 - 998.7 MB Software RAID device
                  998.7 MB     f  ext4    /boot
RAID5 device #1 - 40.9 GB Software RAID device
                   40.9 GB     f  ext4    /
SCSI1 (0,0,0) (sda) - 21.5 GB ATA QEMU HARDDISK
     #1  primary  999.3 MB  B  K  raid
     #2  primary   20.5 GB     K  raid
SCSI2 (0,0,0) (sdb) - 21.5 GB ATA QEMU HARDDISK
     #1  primary  999.3 MB  B  K  raid
     #2  primary   20.5 GB     K  raid
SCSI2 (0,1,0) (sdc) - 21.5 GB ATA QEMU HARDDISK
     #1  primary  999.3 MB     F  swap    swap
     #2  primary   20.5 GB     K  raid

>From there I let the installer finish his work and it was booting and
running right into the raid devices as it should.

So I wonder what exactly is the issue that is left these days with
Ubuntu 16.04?

** Changed in: grub-installer (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1315344

Title:
  Grub install failed on disks with software RAID

Status in grub-installer package in Ubuntu:
  Incomplete

Bug description:
  I've got two 2TB drives set up with identical partitions, which are combined into RAID1 arrays (five mirrors across the two disks).
  On a free RAID1 I've installed Trusty 64bit from the Desktop installer ("try Ubuntu" first, install mdadm, run mdadm --assemble --scan, then start installer). I then wanted grub to be installed onto /dev/sda and /dev/sdb, but both fail.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubiquity 2.18.7
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CasperVersion: 1.340
  Date: Fri May  2 13:05:29 2014
  InstallCmdLine: noprompt cdrom-detect/try-usb=true file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
  LiveMediaBuild: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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