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Thread: RAID 0 Dual Boot Windows 7 Ubuntu; Install Grub failed

  1. #1
    Join Date
    Mar 2011
    Beans
    98
    Distro
    Ubuntu 12.04 Precise Pangolin

    RAID 0 Dual Boot Windows 7 Ubuntu; Install Grub failed

    • More information: AMD64 ; P8Z68-v pro ASUS ; NON-uefi ; 2 * WD 150Gb SATA drives ; ICH8/9/10R SATA RAID controller
    • I select RAID as the value for "SATA MODE" in the Advanced BIOS menu
    • I reboot
    • I intentionally encounter the "Intel Rapid Storage Technology ROM 10.6.0.1091" screen and configure 100% of the available space of the two drives to be RAID 0 and I will now call this logical drive Volume0
    • I proceed to install Windows 7 as normal
    • I select more than half of the available space on Volume0 to be allocated to this Windows 7 installation
    • Windows creates 2 partitions, as by default: SystemReserved (100Mb) and my Windows 7 partition
    • After customising things etc etc in Windows I reboot, having inserted an Ubuntu Server AMD64 12.04 DVD
    • Ubuntu boots up and I go through the normal procedure (i have not appended any BOOT options when I boot into the ncurses-type installation screen)
    • I get to the Partition section of the screen: everything looks find, I see it can see my 300GBish partition: there are the two windows partitions and an unused (FREE SPACE)
    • I set up a swap partition out of that free space
    • I set up a root partition out of that free space
    • I set up a logical boot partition (just because I have been running out of ideas and do not fully understand this) - logical only because I cannot create more than 4 primary partitions on this logical volume
    • Things install etc etc
    • I get to the GRUB section of the installation
    • Where should I install grub to?
    • I see that "/dev/md" is already selected
    • I go into shell and see that only a special file: "control" exists in /dev/mapper
    • I go into /dev/md and see that there are a bunch of ln -s to things such as "/dev/md126", /dev/md126p1, /dev/md126p2 etc etc - even a /dev/md127
    • I have tried installing GRUB to /dev/md126 and to other partitions like /dev/md126p1 etc , even /dev/md/md126 and /dev/md/md126p1 etc etc
    • Each time grub fails to install



    1. What is the difference (if any) between /dev/md and /dev/mapper.
    2. Am I using a FAKERAID? The screen "Intel Rapid Storage Technology ROM 10.6.0.1091" would suggest so because of the ROM part which suggests that this is just a bunch of software? I do not know.
    3. ANSWERED ] I have used a Software raid before and noticed that I had to use mdadm, is mdadm for SW raids and dmraid for FakeRaids? (EDIT::: http://us.generation-nt.com/answer/w...173289421.html )
    4. I like having a /boot partition right at the beginning! I always have. is there anyway to set up RAID 0 with let's say 99% of the total space of the two disks, and have a NON-RAID space left over so that I can have a dedicated /boot partition (I know I could find this out but it would mean removing this Windows installation at the minute)
      (EDIT:: http://forums.anandtech.com/showpost...9&postcount=11 -- it looks more and more like i really do need a dedicated boot partition of some sort that is NOT part of RAID. If I am able to leave a little bit of space and use 99% capacity for RAID 0, leaving 0.5% on SDA and 0.5% on SDB, I could just do a standard /boot ext4 on sda... - only if this is possible ;;; Or i might just keep a USB stick inserted and use that as /boot)
    5. ANSWERED ] does GRUB get installed over-the-top-of the MBR (in the same way that the Windows Boot Loader would?)? Or, does GRUB get installed anywhere and the MBR just points to the GRUB partition? (EDIT::: http://www.linuxquestions.org/questi...d-grub-798042/ )
    6. What can I do in the previous steps to install GRUB.


    Thanks.
    Last edited by 3246251196; June 26th, 2013 at 03:05 AM.

  2. #2
    Join Date
    Mar 2011
    Beans
    98
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: RAID 0 Dual Boot Windows 7 Ubuntu; Install Grub failed

    Bump for this.

    Especially with regards to whether or not I need a separate device JUST for a /boot partition. I have been told that GRUB 2 can deal without the boot partition. But it looks to me like in order to successfully get this dual boot working with RAID 0, I need to have a dedicated /boot partition on a NON-raid device; I am wondering if it is possible - question 4 - to have 99% capacity as RAID 0 on the 2 devices, leaving 0.5% normal on each device and using one of those for a /boot partition.

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