Raid1 mdadm: RAID1 error: mdadm: No super block found on ...

[Reinhard Sy]

Hi 

I have now set my RAID1 but if I use :

[root at muckla root]# mdadm -E /dev/md0
mdadm: No super block found on /dev/md0 (Expected magic a92b4efc, got
00000000)
[root at muckla root]# mdadm -E /dev/md1
mdadm: No super block found on /dev/md1 (Expected magic a92b4efc, got
00000000)
[root at muckla root]# mdadm -E /dev/md2
mdadm: No super block found on /dev/md2 (Expected magic a92b4efc, got
139d47d7)
[root at muckla root]# 

What does it mean ?. I think my raid running well.

Here the output of lsraid for md0:

[root at muckla root]# lsraid -a /dev/md0
[dev   9,   0] /dev/md0         1628B05F.8E582771.6BC25A99.B080AB1F
online
[dev   3,   1] /dev/hda1        1628B05F.8E582771.6BC25A99.B080AB1F good
[dev  22,   1] /dev/hdc1        1628B05F.8E582771.6BC25A99.B080AB1F good


If I do an query with mdadm I get :

[root at muckla root]# mdadm -Q --detail /dev/md0
/dev/md0:
        Version : 00.90.00
  Creation Time : Sun May  2 21:53:46 2004
     Raid Level : raid1
     Array Size : 4882624 (4.66 GiB 4.100 GB)
    Device Size : 4882624 (4.66 GiB 4.100 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Mon May  3 05:49:54 2004
          State : dirty, no-errors
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0


    Number   Major   Minor   RaidDevice State
       0       3        1        0      active sync   /dev/hda1
       1      22        1        1      active sync   /dev/hdc1
           UUID : 1628b05f:8e582771:6bc25a99:b080ab1f
         Events : 0.13
[root at muckla root]# 


Is the state dirty a problem ? I have nothing found in the man page of
mdadm.

Here some additional information about the disks.....

fdisk looks good I set the type to fd
[root at muckla root]# fdisk -l /dev/hda

Disk /dev/hda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot    Start       End    Blocks   Id  System
/dev/hda1             1       608   4883728+  fd  Linux raid autodetect
/dev/hda2           609      1094   3903795   fd  Linux raid autodetect
/dev/hda3          1095      9729  69360637+  fd  Linux raid autodetect
[root at muckla root]# fdisk -l /dev/hdc

Disk /dev/hdc: 80.0 GB, 80026361856 bytes
16 heads, 63 sectors/track, 155061 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes

   Device Boot    Start       End    Blocks   Id  System
/dev/hdc1             1      9688   4882720+  fd  Linux raid autodetect
/dev/hdc2          9689     17438   3906000   fd  Linux raid autodetect
/dev/hdc3         17439    155061  69361992   fd  Linux raid autodetect

Here my /etc/raidtab:

[root at muckla root]# cat /etc/raidtab 
raiddev /dev/md0
        raid-level      1
        nr-raid-disks   2
        nr-spare-disks  0
        chunk-size 4
        persistent-superblock   1
        device  /dev/hda1
        raid-disk       0
        device  /dev/hdc1
        raid-disk       1
raiddev /dev/md1
        raid-level      1
        nr-raid-disks   2
        nr-spare-disks  0
        chunk-size 4
        persistent-superblock   1
        device  /dev/hda2
        raid-disk       0
        device  /dev/hdc2
        raid-disk       1
raiddev /dev/md2
        raid-level      1
        nr-raid-disks   2
        nr-spare-disks  0
        chunk-size 4
        persistent-superblock   1
        device  /dev/hda3
        raid-disk       0
        device  /dev/hdc3
        raid-disk       1


Sorry a lot of questions.

Has anybody got the same problems or is it not a problem ?

BTW: I am running a smp kernel: Linux muckla 2.4.21-9.0.1.EL.um.3smp #1
SMP Thu Apr 22 12:46:27 JST 2004 i686 i686 i386 GNU/Linux

Is this the problem.


Thanks for any hint
Reinhard