NAS540 Volume down ...need help

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  Mijzelf Posts: 3,074  Guru Member

  

  June 2019

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  News from the nas. With
  mdadm --create....
  the nas didn´t start a recovery. The Partition sdb1..3 were los.

  Recovery? The idea is to rebuild a degraded md2. If that is done, and the filesystem is OK, you can let the firmware add the 4th disk.
  

  The whole idea of a 4 disk raid5 is that it can also run with 3 disks.
  

  Leave sdb until you can see your data.
  

  
  

  fdisk says, bad partition table backup at sdb and work with primary table...

  The disk has a GUID partition table, which is supposed to have a 2nd copy at the end of the disk.
  

  
  

  
  

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