Cloning RAID 1 drive to RAID 0

I have a server with its OS drive (2 138gb drives) setup as RAID 1. I have a spare drive (currently doing nothing) that is 278gb that I want to use as my safeguard i.e. I have acronis and I want to clone the OS drive to this 278gb drive.

At the moment the 278gb drive is RAID 0. If I clone the OS drive to the 278gb RAID 0 drive what is likely to happen? Will it simply rebuild as RAID 1? If it has cloned incorrectly will it wipe out my second RAID 1 drive?

Ideally I want to clone the drive input the new one (the 278gb) and work straight away to alleviate downtime.

Any advice appreciated.
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  1. A single drive (the 278GB) cannot be a RAID by itself. A raid 0 array requires atleat 2 drives so i assume that that is a Raid 0 of two 138GB drives
    If i understand correctly, there are 4 physical drives (138 gb each). 2 are mirrored (RAID 1) and the other two are stripped (RAID 0).
    I believe you cannot mirror a Raid1 array on a Raid 0 array. From what you are trying to do, i assume that you are trying to ensure maximun data secutiry.

    Your best bet would be to create a raid 1 array with 4 drives. That means that all 4 drives contain the same data and the system can work with 3 of the 4 drives failing.
    I dont see the point of mirroring a mirrored array (nor the benefits of that).
    If you managed to mirror it on the RAID 0 Then there are 3 copy of the data and a maximum capasity of 138gb (which is that of the smallest drive). Therefor 138gb are lost. If you create a RAID 1 array across 4 drives then you have 4 copies of the same data and the same maximum capacity.
  2. Thanks for your reply. I didnt really give enough info.

    This is my setup.

    OS Drive is 2 138gb drives - RAID 1
    Data Drive is 2 278gb drives - RAID 1

    Spare drive is 278gb that apparently is RAID 0 judging by the screen dump below

    What would you recommend on this? Add the spare drive to the OS RAID 1? A hot spare?
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