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Hardware Thread, RAID 1 - Daft Question in Technical; Hi folks, If I remove one of the two disks from a RAID 1 setup, can it be read in ...
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    Gongalong's Avatar
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    Question RAID 1 - Daft Question

    Hi folks,

    If I remove one of the two disks from a RAID 1 setup, can it be read in another system or will it only work connected to the controller?

    Could you view a RAID 1 setup as backed up in a sense? i.e. two complete sets of data on two separate disks.

    TIA

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    Gongalong's Avatar
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    Actually this answers the latter question at least: Why is raid 1 not a substitute for a backup - NAS-RAID-Technologies - Storage

    I suppose the question really is what you are trying to achieve from backup, and in most situations RAID 1 isn't going to cut it.

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    A lot of it depends on how the controller does it. I know you can read some RAID1s in linux, as it's the type of drive format it uses won't work in Windows. (Example my NAS uses XFS format)

    Steve

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    Gongalong (25th February 2013)

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    Michael's Avatar
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    You could certainly read it as a slave drive in another system.

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    Gongalong (25th February 2013)

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    Quote Originally Posted by Gongalong View Post
    If I remove one of the two disks from a RAID 1 setup, can it be read in another system or will it only work connected to the controller?
    On a Linux software MD RAID array? Yes, easily. For a hardware RAID controller, I'm guessing you'd need an identical controller in the second machine.

    Could you view a RAID 1 setup as backed up in a sense?
    It's not ideal, there are better ways of going about it. What, exactly, are you trying to accomplish?

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    Gongalong's Avatar
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    Purely just whether you could view it as backup if one of the drives failed. I appreciate it offers little else in the way of backup.

    (More a theoretical situation than put into practice.)

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    Quote Originally Posted by Gongalong View Post
    Purely just whether you could view it as backup if one of the drives failed.
    Since RAID isn't classed as a backup even when all drives in the array are working, I would say no.

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    I'd agree with the above, RAID offers redundancy (excluding RAID 0) in the short-term to keep a system live. RAID arrays no matter how big can and do fail. Backups are still critical, including the System State to restore a DC for example.

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