Boot menu problem?

Discussion in 'macOS' started by psychedelic, Jul 22, 2009.

  1. psychedelic macrumors newbie

    Mar 21, 2008
    Hi, I recently set a RAID stripe in my MacPro with two 1TB drives. I reinstalled Leopard and all seems to run OK.
    Now, when I go to boot menu (pressing option key at startup) I can see doubled MacOS drives (named MacOS 1 and MacOS 2) and my Bootcamp drive.
    Is this normal with RAID stripes? In leopard I only see 1 drive (as it should be).

    Thank you for your help and sorry for my bad english. :)
  2. psychedelic thread starter macrumors newbie

    Mar 21, 2008
  3. larkost macrumors 6502a

    Oct 13, 2007
    I have not done this, but I would expect this to happen based on my understanding of how RAID actually works for boot devices. The EFI layer actually does not understand RAID, so it sees the two as separate devices. When you try to boot from them (or any other HFS volume) it first looks in the boot sector of that volume.

    In the case of RAIDed volumes this includes a system that allows the system to see the sections of the RAID as part of a single device, and then booting can continue from there. This is all part of the bootstrap system.
  4. psychedelic thread starter macrumors newbie

    Mar 21, 2008
    Ok, I understand now. Thank you for your explanation. :)

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