Raid-5 Rebuild Problem

Discussion in 'Mac Accessories' started by M-Idiot, Feb 3, 2013.

  1. macrumors newbie

    Jan 8, 2013
    Hello, have a Q regarding Raid-5 rebuild times.
    I have a Lacie 4Big 12T running in Raid 5. Recently the powersupply broke down, forcing the harddisk to shut down abruptly. Now that i replaced the powersupply, the Raid will not boot but its apparently rebuilding the Raid (According to the manual that is. There is no indication of a failed drive, its just rebuilding the Raid). Its doing this for 4 subsequent days now. I have no access to any of the drives, the raid does NOT show up in finder.
    Is this normal behaviour? does it more than 4 days to rebuild a 4 x 3 TB Raid 5? Thank you for your advice,
  2. macrumors 68040

    Aug 9, 2009
    Portland, OR
    That seems like a long time. I would let it go for a few more days... but be ready to just reformat the array and restore from backup... assuming of course that you have been backing up.

  3. brand, Feb 3, 2013
    Last edited: Feb 3, 2013

    macrumors 601


    Oct 3, 2006
    Why would you not contact Lacie about this? When data is concerned you should handle it as expeditiously and directly as possible. Contact Lacie.
  4. macrumors 68040

    Aug 9, 2009
    Portland, OR
  5. macrumors member

    Jul 18, 2012

    I recommend you call us ASAP if the device has not returned to a working status. The rebuild time is usually not that long but it can be if the RAID was nearly full - especially 12TB. Hardware rebuilds scan each sector of each drive and rebuild from the parity on a RAID 5 and with that large of a unit it might take several days. Still, I would call us and start thinking about a backup solution - RAID is not a replacement for proper backups.

    503.844.4500 /

    ~mn, LaCie

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