Is it possible to treat each disk completely separately, thereby keeping the performance of RAID 0, and manually back up from one disk to the other?

LaCie 2big Thunderbolt Series RAID Hard Drive

LaCie 2big Thunderbolt Series RAID Hard Drive

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3 Answers from the Community

  • Answer

    The way to get both performance and redundancy is to use 4 drives total (2 of these Lacie 2big units). Each unit is setup as RAID-0 and then the two units are tied together using RAID-1 for redundancy. This gives you a total of 6TB usable disk space (out of 12TB total). All 4 drives should be the same size and kind. Alas, redundancy does not come cheaply...

    With 1 unit (2 drives) you have 3 options with Mac OS RAID:
    1. RAID-0 (double performance, no redundancy),
    2. RAID-1 (redundancy with no performance improvement)
    3. JBOD (connect 2 or more drives together as 1 volume without having to worry about using similar drives - this option only provides for larger total volume size and does not stripe the drives and provides no performance or redundancy, however, a failure on a drive is limited to that drive only).

    If you have a multiple of 2 drives you can combine redundancy with performance by implementing a RAID-10 array.

  • The 2big has 2 drives inside. If you use Disk Utility to split the array into two separate volumes (ie two separate drives) the benefit of striping is lost, and the performance will be cut in half.

  • You 'can' access each disk as a separate disk or mirror them or stripe them. If you want performance go with striping, if you want data security mirror them.

    You could probably treat them as separate drives and then use TimeMachine to backup from the first to the second but mirroring provides better fault tolerance - i.e. lose and drive and it keeps going.

    The best performance option would be to get this device - stripe the disks (it's how mine shipped anyway) and use an separate 2Tb or 3Tb drive and TimeMachine to backup to.