Need Advice: Recovering from a failed Raid

Discussion in 'Mac Basics and Help' started by bimmeracer3, Apr 3, 2018.

  1. bimmeracer3, Apr 3, 2018
    Last edited: Apr 3, 2018

    bimmeracer3 macrumors newbie


    Dec 11, 2017
    I am looking for some advice on how I can recover files from a partially failed raid. I have a 2 bay Guardian Maximus running Raid-0 and one of the hard drives or drivers have failed due to a power surge.
    The Raid will mount and I was able to recover 70% of the data using Carbon Copy Cloner, but I am not able to recover the rest.

    When mounted I get the following error:
    macOS can’t repair the disk “Photo Storage Raid 1 - MAXimus”.

    You can still open or copy files on the disk, but you can’t save changes to files on the disk. Back up the disk and reformat it as soon as you can.

    Also, I had a backup of the raid, but somehow that failed also.

    Can anyone give me any advice or recommended software that might help me with this issue?

  2. 960design macrumors 68030

    Apr 17, 2012
    Destin, FL
    Never run RAID-0 on important data. RAID-0 is for speed only, typically caching server.
    Run the best RAID you can afford:
    RAID-1 ( mirroring )
    RAID-10 ( mirroring and redundancy )

    Stop accessing the drive.
    DDRescue the drive.
    Try recovery software such as foremost or PhotoRec with duplicated drive.

    Good luck.
  3. HDFan macrumors 65816

    Jun 30, 2007
  4. Ebenezum macrumors 6502a

    Mar 31, 2015
    I agree with 960design, you should stop using the drive(s) immediately!

    And you should never use recovery software on the original drive, DDRescue might be able to clone it. Then work on the clone, Data Rescue might be able to recover the data.

    If the data is very important you might want to consider contacting professional data recovery company.

    Also you might want to make more backups, one isn't enough if the information is important...
  5. warp9 macrumors member


    Jun 8, 2017
    +1 on ditching RAID0. The speed just isn't worth it. If you really need the speed, get a four bay and run RAID10.
  6. winglet69 macrumors member


    Jul 6, 2010
    London, UK
    And if you really want the redundancy get a five bay and run RAID6. From the volume title "Photo Storage Raid 1 - MAXimus" of the OP it would seem that data integrity is far more important than performance and perhaps there was a misunderstanding of different RAID levels. Best of luck, hope you can recover the files.

    (Synology DS1511+ 3TB x5 in R6)

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