Re: mdadm can't start RAID0 volume after power failure

["Philippe Gramoullé" <philippe.gramoulle@mmania.com>]

Hello Andy,

On Fri, 17 Dec 2004 12:44:20 EST
AndyLiebman@aol.com wrote:

  | Looking at your mdadm.conf file, and at the results of your mdadm -QE --scan, 
  | I can see that the UUID numbers are different. Which UUID numbers do you get 
  | when you run mdadm -E /dev/sd{e,f,g,h,i,j,k}1?


  |  I tried to follow the web page  link in your post and I couldn't get to it.

The link is ok and works.

  |  Are you trying to start your array with the wrong UUID number by chance? 

Indeed !! starting it with the detected UUID allowed me to start it:

# mdadm -v -A /dev/md0 --uuid=3c1ad678:d3a7a1ed:1112143d:68b4e569
mdadm: looking for devices for /dev/md0
mdadm: /dev/sdk1 is identified as a member of /dev/md0, slot 6.
mdadm: /dev/sdj1 is identified as a member of /dev/md0, slot 5.
mdadm: /dev/sdi1 is identified as a member of /dev/md0, slot 4.
mdadm: /dev/sdh1 is identified as a member of /dev/md0, slot 3.
mdadm: /dev/sdg1 is identified as a member of /dev/md0, slot 2.
mdadm: /dev/sdf1 is identified as a member of /dev/md0, slot 1.
mdadm: /dev/sde1 is identified as a member of /dev/md0, slot 0.
mdadm: added /dev/sdf1 to /dev/md0 as 1
mdadm: added /dev/sdg1 to /dev/md0 as 2
mdadm: added /dev/sdh1 to /dev/md0 as 3
mdadm: added /dev/sdi1 to /dev/md0 as 4
mdadm: added /dev/sdj1 to /dev/md0 as 5
mdadm: added /dev/sdk1 to /dev/md0 as 6
mdadm: added /dev/sde1 to /dev/md0 as 0
mdadm: /dev/md0 has been started with 7 drives.

and it mounted fine ! 

Still, this is the first time that such a thing happens to me. What could be the reason that UUID would be changed ?

Thanks much,

Philippe

  | 
  | Regards, 
  | Andy Liebman
  | 
  | ># cat /etc/mdadm/mdadm.conf
  | >
  | >DEVICE /dev/sd[efghijk]1
  | >ARRAY /dev/md0 level=raid0 num-devices=7 
  | >UUID=46c66ef8:8acf2810:48adb2d3:85b04900
  | >
  | 
  | >Still, every # mdadm -E /dev/sd[efghijk]1 looks ok, output can be found 
  | here: >http://philou.org/mdadm.log
  | >mdadm.conf is here : http://philou.org/mdadm.conf
  | >
  | ># mdadm -QE --scan
  | >ARRAY /dev/md0 level=raid0 num-devices=7 
  | >UUID=3c1ad678:d3a7a1ed:1112143d:68b4e569
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