RAID 1 for the Macintosh HD?

Discussion in 'Mac Pro' started by caymandrew, Jul 28, 2012.

  1. caymandrew macrumors newbie

    Jul 25, 2012
    All over the place
    My searches haven't turned up much. I have four drives, two 2 TB sata and two 3 TB sata. I'd like to mirror each set with RAID 1

    I had no problem setting up the raid for the two 3 TB's but the 1st of the 2 TB set has the mac os on it. Can I clone the OS drive to an external and boot from it somehow? How do I get around this?

  2. nanofrog macrumors G4

    May 6, 2008
    If you create a mirror out of drives with data on them, it will be wiped out.

    To do what you want however, use the following:
    1. Make a clone of the OS to a separate disk.
    2. Change the boot location to the new clone.
    3. Reboot.
    4. Create the Mirror set using the desired drives.

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