Mirrored Raid as Backup Solution

Discussion in 'Macintosh Computers' started by adamfilip, Oct 22, 2005.

  1. macrumors 6502a


    Apr 13, 2003
    burlington, Ontario canada
    I have a 200 Gig Internal Hard drive that I use for all my files

    i also have a 200 Gig external Firewire drive that backsup the internal drive

    can i set it up on my G5 so that it is mirror Raided.
    im assuming i can with Disk Utility

    I currently have 150 gigs of stuff on the internal drive
    Problem is if i go an create a raid drive. with the external
    will "Disk utility" erase/format my internal drive to setup the mirrored raid

    can i unplug my firewire drive after and then reconnect when i need it backed up?
  2. macrumors G3

    Jul 23, 2002
    Sol III - Terra
    Nope this is not how RAID works.

    RAID 0 is for performance.
    RAID 1 & 5 is some performance gains, and it also keeps a system up and running if a disk fails.
  3. macrumors 603


    Dec 19, 2002
    Raid 3 (byte level) and 4 (block level) provide a parity disk with a copy of all the data striped across the other disks in the array.

    Raid 3:

    Raid 4:

    Downside: you'll need a hardware RAID system to do it, it can't be done with software RAID.

    Edit: seeing that you have only 2 drives, you can't do RAID 3 or 4, but if you ever have more drives, it's a very safe system.
  4. macrumors G5


    Oct 11, 2004
    On the Left Coast - Victoria BC Canada
    Raid != Backup.

    If you do a RAID 1 mirror you may NOT turn off or disconnect your second drive. A Mirror RAID protects you against hard drive mechanical failure, that is all. If you accidentally delete a crititcal file, or munge your OS with a software install, or overwrite a good file with a bad one of the same name, the damage is done immediately to the mirror as well as to the main drive.

    You don't want a RAID. What you really want is a periodic backup, perhaps which you can schedule. Look at Retrospect (commercial), Silverkeeper (shareware) or other programs that can do a backup or a sync between volumes. www.versiontracker.com

    Note: why all of a sudden all the threads confusing RAID with backup??
  5. macrumors member

    Oct 14, 2005
    Southern California

    I'm guessing that it's all the marketing that we've seen lately on external SATA boxes. Look at that, then scan quickly over some vague RAID info - mirror!! backup!! I get it, I need a RAID! Only geeks read the details...

    Good news is, this all comes at a time when HD is blossoming and more people may really be in need of a RAID...

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