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BadBrad's avatar
BadBrad
Aspirant
May 10, 2013

Readynas Duo file corruption question

I assume the Duo (V1 and v2) both use Raid 1 for mirror the drives. My question is does the Duo provide any protection where a file on one drive becomes corrupt but not on the other drive? I Know there are striped RAID configurations for more drive the provide redundancy, but I do not know if a mirror set on the duo provide that kind of file level protection.

A related question is, if it is the case that the Duo does not provide any protection against isolated corrupt files, than what does the duo serve up when a file is requested and the file is corrupted on one drive but not the other?

--Brad

1 Reply

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  • StephenB's avatar
    StephenB
    Guru - Experienced User
    Normally the RAID redundancy kicks in when a read fails. RAID doesn't help if the two corresponding sectors can both be read, but do not match. The system has no way to tell which is correct (and of course they might both be wrong).

    What is returned in that case depends on the RAID implementation. I suspect the first drive wins in the case of the Duo, but am not sure.

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