Download your favorite Linux distribution at LQ ISO.
Go Back > Forums > Linux Forums > Linux - Software
User Name
Linux - Software This forum is for Software issues.
Having a problem installing a new program? Want to know which application is best for the job? Post your question in this forum.


  Search this Thread
Old 12-20-2014, 03:37 PM   #1
LQ Newbie
Registered: Jun 2013
Location: Copenhagen, Denmark
Posts: 3

Rep: Reputation: Disabled
MDADM array degraded after move to new server

I have upgraded my home server with some new goodies.

On my old server I had two 2TB mdadm raid1 arrays configured, which from my understanding should be more or less plug and play.

Well - for one of the arrays is was just that, the other however came up "clean, degraded" having dropped one of the disks.

/dev/md0 consists of /dev/sdb and /dev/sdc - /dev/sdb was dropped
/dev/md1 consists of /dev/sdd and /dev/sde - came up perfectly.

I've tried an assortment of assembling, and finally gave up, and resynced the array, but after a lenghty resync - the disk was dropped again after a reboot.

examine leads me to believe the superblock is dropped from sdb:

mdadm --examine /dev/sdb
   MBR Magic : aa55
Partition[0] :   3907029167 sectors at            1 (type ee)
mdadm --examine /dev/sdc:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 11837750:0da374a3:b3267bd8:6b692947
           Name : SERVER:0
  Creation Time : Sat Jul 20 11:54:11 2013
     Raid Level : raid1
   Raid Devices : 2

 Avail Dev Size : 3906767024 (1862.89 GiB 2000.26 GB)
     Array Size : 1953383360 (1862.89 GiB 2000.26 GB)
  Used Dev Size : 3906766720 (1862.89 GiB 2000.26 GB)
    Data Offset : 262144 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : 19f08135:67a62542:fd34a4d2:f82926d3

    Update Time : Sat Dec 20 22:24:50 2014
       Checksum : d8baeb43 - correct
         Events : 278

   Device Role : Active device 1
   Array State : .A ('A' == active, '.' == missing)

The old server ran Ubuntu 14.04, and the new is running Debian 7.7, but I doubt that is the reason for this.

Does anyone have any ideas about what has happened, and how I can get the array up and running again?
I am currently resyncing two new 4TB disks (in raid1), so when that is done I can move the data from /dev/md0 over there, and completely redo that array. But that would feel a bit like giving up, I'd much rather find a solution.


array, debian, mdadm, raid1

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
[SOLVED] mdadm clean, degraded rereader Linux - Server 3 10-15-2014 07:30 AM
[SOLVED] RAID 5 array not assembling all 3 devices on boot using MDADM, one is degraded. kirby9 Linux - Software 11 11-20-2010 10:32 AM
raid1 mdadm repair degraded array with used good hard drive catbird Linux - Hardware 7 07-09-2009 12:31 AM
mdadm: active, degraded ... what do I do? mesosphere Linux - General 7 06-09-2008 03:18 PM
Degraded raid1 array problem on slack 12.0.0 / mdadm slack-12.0.0 Slackware 5 10-12-2007 06:36 AM > Forums > Linux Forums > Linux - Software

All times are GMT -5. The time now is 03:04 AM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Open Source Consulting | Domain Registration