cannot add device to partitioned raid6 array

[Florian D.]

hi list!

in short:
I created a partitioned raid6 array with 2 missing drives. Now, I want to add a device. It fails with:
flockmock ~ # mdadm -a /dev/md_d4 /dev/sdb2
mdadm: add new device failed for /dev/sdb2 as 4: Invalid argument

I think it is the same problem as in:
http://marc.info/?l=linux-raid&m=115316147716600&w=2



details:
kernel 2.6.20.4
mdadm-2.6.1
the raid6 array:

flockmock ~ # mdadm --detail /dev/md_d4
/dev/md_d4:
        Version : 00.90.03
  Creation Time : Sat Mar 31 19:48:58 2007
     Raid Level : raid6
     Array Size : 490030464 (467.33 GiB 501.79 GB)
  Used Dev Size : 245015232 (233.66 GiB 250.90 GB)
   Raid Devices : 4
  Total Devices : 2
Preferred Minor : 4
    Persistence : Superblock is persistent

    Update Time : Sat Mar 31 23:28:37 2007
          State : clean, degraded
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

     Chunk Size : 32K

           UUID : dfb5e536:2447b984:b7699fd8:8ba37cbf
         Events : 0.2972

    Number   Major   Minor   RaidDevice State
       0       8        2        0      active sync   /dev/sda2
       1       8       34        1      active sync   /dev/sdc2
       2       0        0        2      removed
       3       0        0        3      removed

the device, which I want to add:
flockmock ~ # mdadm -E /dev/sdb2
/dev/sdb2:
          Magic : a92b4efc
        Version : 00.90.00
           UUID : dfb5e536:2447b984:b7699fd8:8ba37cbf
  Creation Time : Sat Mar 31 19:48:58 2007
     Raid Level : raid6
  Used Dev Size : 245015232 (233.66 GiB 250.90 GB)
     Array Size : 490030464 (467.33 GiB 501.79 GB)
   Raid Devices : 4
  Total Devices : 2
Preferred Minor : 4

    Update Time : Sat Mar 31 23:29:23 2007
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 2
  Spare Devices : 0
       Checksum : 8aeeef56 - correct
         Events : 0.2974

     Chunk Size : 32K

      Number   Major   Minor   RaidDevice State
this     4       8       18       -1      spare   /dev/sdb2

   0     0       8        2        0      active sync   /dev/sda2
   1     1       8       34        1      active sync   /dev/sdc2
   2     2       0        0        2      faulty removed
   3     3       0        0        3      faulty removed

dmesg shows such error mesgs:
[  220.681135] md: sdb2 has invalid sb, not importing!
[  220.681186] md: md_import_device returned -22
[  220.681435] md: sdb2 has invalid sb, not importing!
[  220.681463] md: md_import_device returned -22

any idea how to resolve this? thanks,
florian

PS: please cc me in replies, thanks.
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