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CD1

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    How protected is my data

    in Pre-Sales Support

    Posted

    28 minutes ago, Squid said:

    Yeah, it happens.  I have terrible luck with WD drives and have more than 1 drop dead.  Rebuild onto the replacement no problems.

     

    1 minute ago, Nepherim said:

    Yes. I'm replacing a WD drive right now that had failed. So far no issues, but recovery is underway.

    Thanks guys, I am starting to see a pattern with WD drives :D

    How protected is my data

    in Pre-Sales Support

    Posted

    2 hours ago, Nepherim said:

    A parity drive protects you against a single drive failure. If a drive fails, plug a new drive in, and the new drive will get rebuilt with the data that was on the failed drive.

    If the parity drive fails, then you plug a new drive in, and parity will be rebuilt. A parity drive is not a copy of any one drive. It represents what is stored across all drives, and thus allows any single drive to be lost and replaced.

    You can have multiple parity drive to protect against multiple concurrent drive failures.

     

    1 hour ago, Squid said:

    True.  Once of unRaid's best points.  If you're running say RAID-5 and 2 drives drop dead, then you've lost all of your files permanently.  If running unRaid (and a single parity) and you lose 2 drives at the same time, your worst case scenario is only losing a fraction of your files.

     

    I can never understand the mentality behind RAID that seems to think that it's better to lose everything than lose some in worst case scenarios.

    Thanks for the reply but has any one ever experienced a complete drive failure and if they had any issues recovering their data? 

    How protected is my data

    in Pre-Sales Support

    Posted

    Hello 

     

    I understand that unRaid is not a raid (as it is in the name) so how protected is my data encase of a drive failure?

     

    I know there is a parity drive but say a disk fails and can no longer be read even by removing it and plugging it into another computer will I still be able to recover the data that was lost from that drive?

     

    Also I have seen on the wiki that dual parity is not a copy of the first parity drive (like in raid 6) so what happens if one of the parity drive fails?   

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