Re: Debian squeeze on raid 0 and install grub2

[Damien Moity]

Le 02/07/2014 10:50, Andrey Borzenkov a écrit :
> On Wed, Jul 2, 2014 at 12:13 PM, Damien Moity <address@hidden> wrote:
> > Is it software MD raid or fake-raid (dmraid)? It appears pure software
> > raid, but just to be sure ...
> >
> >
> > It is software raid create with 'mdadm'.
> It's not going to work. You cannot install bootloader on software
> raid0. You have to install it on each individual disk. You will need
> to install it in MBR so it can be embedded.

Ok thank's.  I'll try that.
A work colleague suggested this documentation : 
http://www.gentoo.org/doc/fr/gentoo-x86+raid+lvm2-quickinstall.xml
Example 2.8.

> > Le 02/07/2014 10:00, Andrey Borzenkov a écrit :
> >
> > > On Wed, Jul 2, 2014 at 10:25 AM, Damien Moity <address@hidden>
> > > wrote:
> > > > Hello,
> > > >
> > > > I wrote a script that allows me to install the distribution "debian
> > > > squeeze"
> > > > on a RAID 0 but the script crashes when installing grub :
> > > > -------
> > > > grub-install --modules="raid mdraid part_gpt ext2" /dev/md0
> > > Is it software MD raid or fake-raid (dmraid)? It appears pure software
> > > raid, but just to be sure ...
> > >
> > > > /usr/sbin/grub-setup: warn: Attempting to install GRUB to a partitionless
> > > > disk.  This is a BAD idea..
> > > > /usr/sbin/grub-setup: error: embedding is not possible, but this is
> > > > required
> > > > when the root device is on a RAID array or LVM volume.
> > > > -------
> > > >
> > > > Grub version :
> > > > -------
> > > > update-grub -v
> > > > grub-mkconfig (GRUB) 1.98+20100804-14+squeeze1
> > > >
> > > > grub-install -v
> > > > grub-install (GRUB) 1.98+20100804-14+squeeze1
> > > > -------
> > > >
> > > > First I boot on a "System Rescue CD" and I create 'logical raid0' with
> > > > 'mdadm' :
> > > > -------
> > > > mdadm -D /dev/md0
> > > > /dev/md0:
> > > >           Version : 1.2
> > > >     Creation Time : Tue Jul  1 14:07:21 2014
> > > >        Raid Level : raid0
> > > >        Array Size : 52427776 (50.00 GiB 53.69 GB)
> > > >      Raid Devices : 2
> > > >     Total Devices : 2
> > > >       Persistence : Superblock is persistent
> > > >
> > > >       Update Time : Tue Jul  1 14:07:21 2014
> > > >             State : clean
> > > >    Active Devices : 2
> > > > Working Devices : 2
> > > >    Failed Devices : 0
> > > >     Spare Devices : 0
> > > >
> > > >        Chunk Size : 512K
> > > >
> > > >              Name : sysresccd:0  (local to host sysresccd)
> > > >              UUID : 972ee921:bc2ecdb5:0c9b9350:14cbf787
> > > >            Events : 0
> > > >
> > > >       Number   Major   Minor   RaidDevice State
> > > >          0       8        0        0      active sync   /dev/sda
> > > >          1       8       16        1      active sync   /dev/sdb
> > > > -------
> > > >
> > > > I create raid0 partitions with 'gdisk' :
> > > > -------
> > > > address@hidden /root % gdisk -l /dev/md0
> > > > GPT fdisk (gdisk) version 0.8.8
> > > >
> > > > Partition table scan:
> > > >     MBR: protective
> > > >     BSD: not present
> > > >     APM: not present
> > > >     GPT: present
> > > >
> > > > Found valid GPT with protective MBR; using GPT.
> > > > Disk /dev/md0: 104855552 sectors, 50.0 GiB
> > > > Logical sector size: 512 bytes
> > > > Disk identifier (GUID): 45EC12F7-47B7-4339-A219-199F35A51B5F
> > > > Partition table holds up to 128 entries
> > > > First usable sector is 34, last usable sector is 104855518
> > > > 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           18431   8.0 MiB     EF02  BIOS boot
> > > > partition
> > > >      2           18432        41961471   20.0 GiB    EF00  Linux
> > > > filesystem
> > > >      3        41961472        44058623   1024.0 MiB  8200  Linux swap
> > > >      4        44058624       104855518   29.0 GiB    8300  Linux
> > > > filesystem
> > > > -------
> > > >
> > > > I make filesystem on created partitions :
> > > > * part1 (md0p1) with mkfs.ext3 => bios_grub
> > > > * part2 (md0p2) with mkfs.ext3 => /
> > > > * part3 (md0p3) with mkswap => swap
> > > > * part4 (md0p4) with mkswap => /srv
> > > >
> > > > I install debian distribution on md0p2 :
> > > > * partimage -B=foo -b restore /dev/md0p2 my_image_debian
> > > > * e2fsck -f -y /dev/md0p2
> > > > * resize2fs -f /dev/md0p2
> > > >
> > > > I mount ressources :
> > > > -------
> > > > mount -l | grep md0
> > > > /dev/md0p2 on /mnt/gentoo type ext3 (rw)
> > > > /dev/md0p4 on /mnt/gentoo/srv type ext3 (rw)
> > > > -------
> > > >
> > > > I init fstab and mtab with the new partitions.
> > > >
> > > > And now i want to install grub. I write disk on
> > > > /mnt/gentoo/boot/grub/device.map :
> > > > -------
> > > > cat /mnt/gentoo/boot/grub/device.map
> > > > (md0)   /dev/disk/by-id/md-uuid-972ee921:bc2ecdb5:0c9b9350:14cbf787
> > > > (md0p2) /dev/disk/by-id/md-uuid-972ee921:bc2ecdb5:0c9b9350:14cbf787-part2
> > > > (hd0)   /dev/disk/by-id/ata-VBOX_HARDDISK_VB4b33f8ee-87039d31
> > > > (hd1)   /dev/disk/by-id/ata-VBOX_HARDDISK_VBc34d645e-16ef1e20
> > > > -------
> > > >
> > > > I update grub with : chroot /mnt/gentoo /bin/bash update-grub and and
> > > > after
> > > > installation of grub crashes.
> > > >
> > > > Do you have any ideas on what could be wrong ? I read many forums but I
> > > > have
> > > > not found a solution.
> > > >
> > > > Thanks for your help.
> > > >
> > > > Damien.
> > > >
> > > > _______________________________________________
> > > > Help-grub mailing list
> > > > address@hidden
> > > > https://lists.gnu.org/mailman/listinfo/help-grub