Software RAID 10 ... can you boot from just two of the drives?

Discussion in 'Mac Pro' started by benguild, Nov 25, 2012.

  1. benguild macrumors 6502a

    Jul 29, 2003
    I'm pretty sure that the Mac's built-in RAID feature is actually a 0+1 ... meaning that it's a mirror of two RAID-0s. Is that right?

    So, in other words, one could boot from just the two if the second two drives were removed?

    Just wondering. I'd have to check the IDs or positions of the drives in Disk Utility beforehand.
  2. PowerPCMacMan macrumors 6502a


    Jul 17, 2012
    PowerPC land
    What exactly are you asking? It is 0+1 using Disk Utility.. anything over that would require an Apple RAID card which I don't recommend as they can't be used with Windows. A 3rd party RAID card from Areca can be used to RAID drives under Windows - IF AND ONLY IF WINDOWS IS ALL YOU WANT TO RAID. If you mainly use OS X and NOT WINDOWS, then the Apple RAID card would be a good solution for you.

    So, what is the question?

  3. benguild thread starter macrumors 6502a

    Jul 29, 2003
    I'm asking if one were to remove two of the drives and attempt to boot the machine, would it work?
  4. deconstruct60 macrumors 604

    Mar 10, 2009
    If you remove the correct two ( leaving behind the redundant pair for each removed drive ) then it will run. 0 + 1 or 1 + 0 doesn't make much of a difference. Which drives are in the "1" ( data stored on two drives ) is more important.

    If used Disk Utility to set-up RAID 10 then can just select a HDD in the right and do a 'Get Info' (cmd-I ). In that info there will be disk indentifier number. Typically, those line up on a mac pro by bay number.

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