Ubuntu
grub2 package

grub not recognising my GPT+mdadm+lvm layout

Bug #1208268 reported by Robert Collins on 2013-08-04

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	grub2 (Ubuntu)	Expired	High	Unassigned

Bug Description

I have a setup that AIUI is supported, but grub doesn't handle it for some reason.

I have 4 3TB disks in a non-UEFI AMD 64-bit PC.

Each disk has a 10MiB Bios Boot Partition, and the remainder in a 'linux raid' partition.
MDADM then has the 4 linux raid partitions in RAID6.
On top of that I have LVM2.

Grub-install finds the right modules AFAICT - and I've tried hard coding the gpt+mdadm+lvm recognisers in, wit no joy.

At the moment my workaround is to have a manually created USB key with a copy of the current kernel on it.

partition tables (sda is the aforementioned USB key)

sgdisk -p /dev/sdb
Disk /dev/sdb: 5860531055 sectors, 2.7 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): 1F47EFB2-48D7-4AD3-ABBE-401315027D53
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 5860531021
Partitions will be aligned on 2048-sector boundaries
Total free space is 2014 sectors (1007.0 KiB)

Number Start (sector) End (sector) Size Code Name
1 2048 22527 10.0 MiB EF02 BIOS boot partition
2 22528 5860531021 2.7 TiB FD00 Linux RAID
sgdisk -p /dev/sdc
Disk /dev/sdc: 5860531055 sectors, 2.7 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): 9CC043F7-A718-425D-B1EF-A790447E95C6
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 5860531021
Partitions will be aligned on 2048-sector boundaries
Total free space is 2014 sectors (1007.0 KiB)

Number Start (sector) End (sector) Size Code Name
1 2048 22527 10.0 MiB EF02 BIOS boot partition
2 22528 5860531021 2.7 TiB FD00 Linux RAID
sgdisk -p /dev/sdd
Disk /dev/sdd: 5860531055 sectors, 2.7 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): 54345A02-B198-405C-8A1E-D6A981505D78
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 5860531021
Partitions will be aligned on 2048-sector boundaries
Total free space is 2014 sectors (1007.0 KiB)

Number Start (sector) End (sector) Size Code Name
1 2048 22527 10.0 MiB EF02 BIOS boot partition
2 22528 5860531021 2.7 TiB FD00 Linux RAID
sgdisk -p /dev/sde
Disk /dev/sde: 5860531055 sectors, 2.7 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): 7689B7B0-94A5-4B40-AAB0-B8F6BDA26871
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 5860531021
Partitions will be aligned on 2048-sector boundaries
Total free space is 2014 sectors (1007.0 KiB)

Number Start (sector) End (sector) Size Code Name
1 2048 22527 10.0 MiB EF02 BIOS boot partition
2 22528 5860531021 2.7 TiB FD00 Linux RAID

The mdadm layout:
sudo mdadm --detail /dev/md127
/dev/md127:
        Version : 1.2
  Creation Time : Tue Feb 12 17:31:04 2013
     Raid Level : raid6
     Array Size : 5860245504 (5588.77 GiB 6000.89 GB)
  Used Dev Size : 2930122752 (2794.38 GiB 3000.45 GB)
   Raid Devices : 4
  Total Devices : 4
    Persistence : Superblock is persistent

    Update Time : Mon Aug 5 11:31:31 2013
          State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
  Spare Devices : 0

Layout : left-symmetric
Chunk Size : 512K

           Name : lifelesswks:lifelesswks (local to host lifelesswks)
           UUID : 203dffb7:ac6b75af:4ac45e35:6fe07126
         Events : 315908

    Number Major Minor RaidDevice State
       7 8 34 0 active sync /dev/sdc2
       6 8 50 1 active sync /dev/sdd2
       4 8 66 2 active sync /dev/sde2
       5 8 18 3 active sync /dev/sdb2

pvdisplay
  --- Physical volume ---
  PV Name /dev/md127
  VG Name lifelesswks
  PV Size 5.46 TiB / not usable 3.00 MiB
  Allocatable yes (but full)
  PE Size 4.00 MiB
  Total PE 1430723
  Free PE 0
  Allocated PE 1430723
  PV UUID a8ExO2-FUhl-BPwo-9Aif-XAE3-chQA-1gmv80

vgdisplay
  --- Volume group ---
  VG Name lifelesswks
  System ID
  Format lvm2
  Metadata Areas 1
  Metadata Sequence No 36
  VG Access read/write
  VG Status resizable
  MAX LV 0
  Cur LV 1
  Open LV 1
  Max PV 0
  Cur PV 1
  Act PV 1
  VG Size 5.46 TiB
  PE Size 4.00 MiB
  Total PE 1430723
  Alloc PE / Size 1430723 / 5.46 TiB
  Free PE / Size 0 / 0
  VG UUID 09ObfW-8L9y-Nevl-DOl7-IjUY-jQvn-QSsDlo

lvdisplay
  --- Logical volume ---
  LV Path /dev/lifelesswks/primary
  LV Name primary
  VG Name lifelesswks
  LV UUID UWnID9-LeLi-h8dR-rTgC-pPdS-9muQ-IBtr2D
  LV Write Access read/write
  LV Creation host, time ,
  LV Status available
  # open 1
  LV Size 5.46 TiB
  Current LE 1430723
  Segments 1
  Allocation inherit
  Read ahead sectors auto
  - currently set to 4096
  Block device 252:0

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: grub-pc 2.00-13ubuntu3
ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
Uname: Linux 3.5.0-17-generic x86_64
ApportVersion: 2.9.2-0ubuntu8.1
Architecture: amd64
Date: Mon Aug 5 11:11:43 2013
MarkForUpload: True
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=en_AU.UTF-8
SHELL=/bin/bash
SourcePackage: grub2
UpgradeStatus: Upgraded to raring on 2013-07-14 (21 days ago)

See original description

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