RAID Question

Discussion in 'Mac Accessories' started by mawyatt, Dec 21, 2012.

  1. mawyatt macrumors member

    Joined:
    Aug 27, 2012
    #1
    I have 2 LaCie 2Big 4TB Thunderbolt drives and would like to configure them into a 4TB RAID 0 stripped configuration mirrored on the other 4TB 2Big. I tried the disk utility that is on the MBPr but could only get them configured as a 8TB RAID 0 or a 8TB combined drive. Anyone know if I can set these two LaCIe 2Bigs up as a 4TB RAID 0 stripped, mirrored drive?

    Thanks,
     
  2. el-John-o macrumors 65816

    Joined:
    Nov 29, 2010
    Location:
    Missouri
    #2
    As far as I know, that won't work. If I'm understanding you right, you basically want RAID 1+0 but across two seperate enclosures?

    The problem here is, the two enclosures. In order to do RAID 1+0 you need to have all the drives on the same controller, or at least one two controllers designed to talk to each other.

    I would suggest doing your RAID 0 setup as you planned, and using backup software to backup the first array (which will appear as one drive) to the second array. Also, I don't think you are going to get 8GB. I think that Lacie 2Big is two 2TB drives is it not? Hitachi is the only company I'm aware of making a 4TB drive and I don't even know if they are shipping yet. Either way, they are $400 a pop, I doubt that's what the 2Big is running. In RAID 0 mode it'll be 4TB, in JBOD mode it'll be 2x2TB, and in RAID 1 it'll be 2TB. That is, unless you meant you want to combine all 4 drives into an 8GB RAID 0, in which case no, you can't do that on two separate controllers. I wouldn't advise it anyway, if you lose one drive you lose ALL of your data. There is a 5% annual fail rate on hard drives, 4 drives each with a 5% chance of failing in their first year (that fail rate increases each year), those are not good odds if your data is important.
     
  3. mawyatt thread starter macrumors member

    Joined:
    Aug 27, 2012
    #3
    John,

    Thanks for the note. I tried every which way I could think and could not get this to work the way I wanted. The 2Bigs are 2TB 7200rpm Seagate drives. I did try something for fun which I will change. I was able to put all four 2TB drives, two from each 2Big enclosure, into a RAID 0 8TB configuration. I did the Black Magic test and these recorded 497M 515M W/R performance. I loaded some images on this RAID 0 8TB config, and it is really fast!!!

    I know I can't leave it this way (4 drive RAID 0), so I'll probably configure into two RAID 0 4TB, one as backup with Time Machine.
     

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