Public bug reported:
This is 100% reproducible with metadata 0.9 and 1.0. We are installing a
system with FAI (Fully Automatic Installation), and creating a full disk
RAID1 array with two devices (/dev/sda and /dev/sdb). This results in a
device /dev/md0 which we then label with a GPT label, and partition with
parted, which gives us devices of the form /dev/md0p1, /dev/md0p2, etc.
Since we are creating the RAID array with metadata 0.9 or 1.0, the
metadata ends up at the end of the array, and so the BIOS should have no
trouble reading from each disk individually to load the boot-loader,
etc. What's more, grub2 supports GPT, and ordinarily has no trouble
booting from a GPT labeled disk.
At the end of the FAI installation, we install grub2 like this:
grub-install /dev/md0
which results in the usual "no errors reported" message that Grub2
prints out. What we expect at this point is for md to automatically sync
the grub2 changes to both /dev/sda and /dev/sdb, and for the BIOS to be
able to boot from either device.
What happens instead is that when the BIOS attempts to boot from either
device, it hangs with a cursor blinking at the top-left corner of the
screen *indefinitely*. So, it seems like although Grub 2 thinks the
installation went fine, it is not actually OK.
The interesting thing is that when we install Grub 2 to /dev/sda and
/dev/sdb individually, rather than /dev/md0, everything works as
intended. I've seen references on the web indicating that installing to
the raw devices is the right thing to do, but I could not find any
official documentation supporting the claims.
If grub is supposed to be installed to /dev/sda and /dev/sdb, then the
bug is that it doesn't complain when an attempt is made to install it to
/dev/md0.
If it should work even when installed to /dev/md0 (with metadata 0.9 and
1.0), then the bug is that it doesn't actually install properly.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: grub2 1.99-21ubuntu3.1
ProcVersionSignature: Ubuntu 3.2.0-25.40-generic 3.2.18
Uname: Linux 3.2.0-25-generic i686
ApportVersion: 2.0.1-0ubuntu8
Architecture: i386
Date: Fri Jun 29 15:21:36 2012
ProcEnviron:
TERM=xterm
SHELL=/bin/bash
SourcePackage: grub2
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386 precise
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https://bugs.launchpad.net/bugs/1019389
Title:
Grub 2 hangs on boot after installing on RAID1 device (/dev/md0),
reports no problems during install
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