Converting RAID5 -> RAID6

Hi,

I have a server that I have upgraded from RAID1 to RAID5 and want to add 
a device to convert it to RAID6.

To do this I removed /dev/sdb2 from /dev/md0 (was on dev/sda2 & 
/dev/sdb2), partitioned, created /dev/md1 and used LVM to move the data 
over. I have then allowed it to rebuild and added /dev/sda3 to /dev/md1.

but I keep getting this error:

root@server:~# mdadm --grow /dev/md1 --level=6 --raid-devices=4 
--backup-file=/root/md1.backup
mdadm: metadata format 00.90 unknown, ignored.
mdadm: /dev/md1: Cannot reshape array without increasing size (yet).

Can anyone tell why?

Regards,
Roger

root@server:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] 
[raid4] [raid10]
md1 : active raid5 sda3[3](S) sdc3[1] sdd3[2] sdb3[0]
       3906525056 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU]

unused devices: <none>
root@server:~# mdadm --detail /dev/md1
mdadm: metadata format 00.90 unknown, ignored.
/dev/md1:
         Version : 00.90
   Creation Time : Sun Oct  2 15:34:44 2011
      Raid Level : raid5
      Array Size : 3906525056 (3725.55 GiB 4000.28 GB)
   Used Dev Size : 1953262528 (1862.78 GiB 2000.14 GB)
    Raid Devices : 3
   Total Devices : 4
Preferred Minor : 1
     Persistence : Superblock is persistent

     Update Time : Tue Oct  4 12:40:12 2011
           State : clean
  Active Devices : 3
Working Devices : 4
  Failed Devices : 0
   Spare Devices : 1

          Layout : left-symmetric
      Chunk Size : 64K

            UUID : e3014b69:92684343:b34c445f:7ce90c42
          Events : 0.16484

     Number   Major   Minor   RaidDevice State
        0       8       19        0      active sync   /dev/sdb3
        1       8       35        1      active sync   /dev/sdc3
        2       8       51        2      active sync   /dev/sdd3

        3       8        3        -      spare   /dev/sda3

root@server:~# parted /dev/sda
GNU Parted 2.2
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) p
Model: ATA ST32000641AS (scsi)
Disk /dev/sda: 2000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start   End     Size    File system  Name  Flags
  1      17.4kB  1018kB  1001kB                     bios_grub
  2      1018kB  257MB   256MB   ext2
  3      258MB   2000GB  2000GB                     raid

(parted) select /dev/sdb
Using /dev/sdb
(parted) p
Model: ATA ST32000641AS (scsi)
Disk /dev/sdb: 2000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start   End     Size    File system  Name  Flags
  1      17.4kB  1018kB  1001kB                     bios_grub
  2      1018kB  257MB   256MB   ext2
  3      258MB   2000GB  2000GB                     raid

(parted) quit


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