Need Help Fixing OS Raid 1

Comments

• tetech OG

  January 2023 edited January 2023

  If you're not comfortable doing it, you should hire a tech.
  @skorupion was looking for work?
• AuroraZero ModeratorHosting Provider

  January 2023

  If I had time I would rebuild it for him. Just a little bit in my plate for now. @skorupion should be able to handle it. If he isn't able or something comes up feel free to PM and we will see if we can sort it

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• Radi Hosting ProviderOG

  January 2023 edited January 2023

  Steps to replace a broken disk in software RAID array.

  Mark the disk as failed:
  mdadm --manage /dev/md0 --fail /dev/sdb1

  Verify:
  cat /proc/mdstat

  Example output:
  Personalities : [linear] [multipath] [raid0] [raid1] [raid5] [raid4] [raid6] [raid10]
  md0 : active raid1 sda1[0] sdb1 [2] (F)
  976773168 blocks [2/1] [U_]

  md1 : active raid1 sda2[0] sdb2[1]
  976773168 blocks [2/2] [UU]

  Remove disk from array:
  mdadm --manage /dev/md0 --remove /dev/sdb1

  P.S. You need to do the step 2 for each array, respectively replacing the partitions.

  Replace disk on machine.

  Copy partition table from the healthy disk to the replaced one.
  sfdisk -d /dev/sda | sfdisk /dev/sdb

  Add the replaced disk back to the array:
  mdadm --manage /dev/md0 --add /dev/sdb1

  P.S. You need to do the step 5 for each array, respectively replacing the partitions.

  Verify with:
  /sbin/mdadm --detail /dev/md0
  or again:
  cat /proc/mdstat

  Thanked by (4)ariq01 ehab bdl Not_Oles

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• Falzo Senpai

  January 2023

  First step should be taking a full backup of all data while it's still accessible. If the remaining disk dies during rebuild you'll be f*cked. Any sysadmin taking on such jobs should clarify on the risks before and whose liability that is. Just saying. 😉

  Thanked by (7)SeederKun bdl AuroraZero skorous Not_Oles tenji AlwaysSkint
• AuroraZero ModeratorHosting Provider

  January 2023

  @skorupion did this get sorted or what? I want to drop it off my radar and move on.

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• skorupion Services Provider

  January 2023

  @AuroraZero said:
  @skorupion did this get sorted or what? I want to drop it off my radar and move on.

  Yeah fixed itself, and was resynchronizing.

  Thanked by (2)AuroraZero AlwaysSkint

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• AuroraZero ModeratorHosting Provider

  January 2023

  @skorupion said:

  @AuroraZero said:
  @skorupion did this get sorted or what? I want to drop it off my radar and move on.

  Yeah fixed itself, and was resynchronizing.

  Ok 👍 off to do some writing.

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