[Bug 665405] Re: Bad sector on disk failing mdadm RAID array and marking all disks as spares.

Launchpad Bug Tracker 665405 at bugs.launchpad.net
Sun Mar 12 22:00:19 UTC 2017


Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: mdadm (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/665405

Title:
  Bad sector on disk failing mdadm RAID array and marking all disks as
  spares.

Status in mdadm package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: mdadm

  Description:	Ubuntu 10.04.1 LTS
  Release:	10.04
  64bit
  mdadm - v2.6.7.1 - 15th October 2008

  I have a failing hard drive that is in a 3 disk RAID 5 software array.
  I am using mdadm to create/manage the array. When a sector goes bad on
  the disk it freezes Ubuntu. Upon restart the array becomes degraded
  and says that there is not enough devices to start the array. If I
  boot to a live CD and install mdadm and check the status of the array.
  It has all 3 drives marked as spare drives.

  The following is how I correct the problem. While still login to the
  live CD I run a badblocks scan (badblocks -nsv) on the failing drive.
  At this point I believe that the drive sees the bad block and marks it
  as such. I then shutdown and remove the failing drive's SATA cable.
  Then I boot back into the live CD install mdadm and force assemble the
  array. I then shut back down and reconnect the failing drive's SATA
  cable. The array boots degraded then I re-add the failing drive back
  into the array to get rebuilt.

  
  What i expected to happen is that Ubuntu marks the sector or drive as failed and does not freeze. If it just marks it as failed then i can run a badblocks scan on the drive and the drive can remap the bad sector. At which point I can re-add the drive back to the array all while Ubuntu is still up and running

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