RAID 5 Question for Mac Pro

Posted on 2011-10-25
Last Modified: 2012-05-12
I am a noob to mac and our dept just purchased a mac pro server with os x server (snow lep) running on it.

I am trying to setup a Raid 5 configuration.  I open the disk utility and I can see 4x 2 TB drives.

When I add those 4 drives to make a Raid 5 config, the only options I see under RAID TYPE is:
-Mirrored Raid Set
-Striped Raid Set
-Concatenated Disk Set

Should I conclude that my Raid card is not capable of Raid 5 or is there some mysterious Mac setting I am overlooking :)

Remember I am a Mac noob.  Thanks.
Question by:phcc75
    LVL 38

    Expert Comment

    by:Aaron Tomosky
    I can only offer some high level advice as when I played with this stuff I decided against it. Mirror is raid 1, striped is raid 5, concatenated is raid 0.
    I was going to use raid 1 but creating or breaking the mirror requires wiping the drives. I didn't like that.

    Author Comment

    I went ahead and created a "Striped Raid Set" using only 3 drives.  If each this truly a Raid 5 wouldn't I expect to see the size of the Volume to be 4 TB?  Each drive is 2 TB.  After the Raid set was created I noticed that the size is 6TB.  Is this really Raid 5?
    LVL 38

    Expert Comment

    by:Aaron Tomosky
    Turns out I was wrong.

    There is no raid 5.
    LVL 13

    Expert Comment

    RAID5 is not supported by OS X software. there is an extra RAID card you must buy from Apple that does it.
    LVL 19

    Expert Comment

    RAID 5 on mac requires a RAID card.

    Accepted Solution

    I figured it out.  There is a separate raid utility. It is odd that it isn't found within the Disk Utility.

    Author Closing Comment

    There is a seperate utility for the raid.  I thought it would be in the disk utility but I was wrong.

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