Re: missing superblock on RAID5

[rob <rob@fantinibakery.com>]

that does look strange.  But I've been using software raid for just a 
couple weeks, so don't know a lot about it.

here is same command on our computer. i have only 2 devices.  looks like 
something is up with yours.  do you have another md device you can check 
the command on? 



root@fbc5:~ #  mdadm --detail /dev/md0
/dev/md0:
       Version : 00.90.00
 Creation Time : Tue Sep 30 15:22:45 2003
    Raid Level : raid1
    Array Size : 8337600 (7.95 GiB 8.54 GB)
   Device Size : 8337600 (7.95 GiB 8.54 GB)
  Raid Devices : 2
 Total Devices : 2
Preferred Minor : 0
   Persistence : Superblock is persistent

   Update Time : Fri Oct 10 08:37:34 2003
         State : dirty, no-errors
Active Devices : 2
Working Devices : 2
Failed Devices : 0
 Spare Devices : 0


   Number   Major   Minor   RaidDevice State
      0       8        6        0      active sync   
/dev/scsi/host0/bus0/target1/lun0/part6
      1       8       22        1      active sync   
/dev/scsi/host0/bus0/target3/lun0/part6
          UUID : 131c021d:7bc1e937:1bea7923:d7eed283
        Events : 0.54



Victor wrote:

> Now that you mention it I remember to have read somewhere that suberblocks
> are written at the end of _partitions_ and not arrays.
>
> Thanks for enlighten me :)
>
> Maybe another stupid question:
> # mdadm --detail /dev/md0
> /dev/md0:
>        Version : 00.90.00
>  Creation Time : Sun May 18 14:19:37 2003
>     Raid Level : raid5
>     Array Size : 241254336 (230.08 GiB 247.04 GB)
>    Device Size : 80418112 (76.69 GiB 82.35 GB)
>   Raid Devices : 4
>  Total Devices : 5
> Preferred Minor : 0
>    Persistence : Superblock is persistent
>
>    Update Time : Wed Oct  8 23:53:50 2003
>          State : dirty, no-errors
> Active Devices : 4
> Working Devices : 4
> Failed Devices : 1
>  Spare Devices : 0
>
>         Layout : left-symmetric
>     Chunk Size : 64K
>
>    Number   Major   Minor   RaidDevice State
>       0       3       65        0      active sync
> /dev/ide/host0/bus0/target1/lun0/part1
>       1      22        1        1      active sync
> /dev/ide/host0/bus1/target0/lun0/part1
>       2      33        1        2      active sync
> /dev/ide/host2/bus0/target0/lun0/part1
>       3      34        1        3      active sync
> /dev/ide/host2/bus1/target0/lun0/part1
>           UUID : d8e2995c:dac28dbb:042eb748:bad0f5d6
>         Events : 0.52
>
>
> It says (or at least I think it says) that this array has 5 devices of which
> one is faulty. That's not true, it consists only out of 4 devices.
>
> Victor
>  

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