[gentoo-server] mdadm: Cannot reliably determine size of array to create bitmap

[Karl Hiramoto]

Hi all

I have a 10 severs or so running SW raid..  After testing the 
write-intent bitmap for some time on one sver, i decided to use it on 
all of them.

http://gentoo-wiki.com/HOWTO_Gentoo_Install_on_Software_RAID#Write-intent_bitmap


On one sever i try and create the bitmap:

# mdadm --grow --bitmap=internal /dev/md1
mdadm: Cannot reliably determine size of array to create bitmap - sorry.

# cat /proc/mdstat
Personalities : [raid1] [raid5]
md1 : active raid5 sdb3[3] sda3[2] hdc3[1] hda3[0]
     1170198336 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU]

md0 : active raid1 sdb1[3] sda1[2] hdc1[1] hda1[0]
     136448 blocks [4/4] [UUUU]
     bitmap: 0/17 pages [0KB], 4KB chunk

#mdadm --version
mdadm - v2.5.5 - 23 October 2006



# mdadm -D /dev/md1
/dev/md1:
       Version : 00.90.03
 Creation Time : Thu Mar 16 18:54:48 2006
    Raid Level : raid5
    Array Size : 1170198336 (1115.99 GiB 1198.28 GB)
   Device Size : 390066112 (372.00 GiB 399.43 GB)
  Raid Devices : 4
 Total Devices : 4
Preferred Minor : 1
   Persistence : Superblock is persistent

   Update Time : Mon Nov 13 11:10:16 2006
         State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
 Spare Devices : 0

        Layout : left-symmetric
    Chunk Size : 64K

          UUID : 02044de5:04d26df9:92b0a01c:8df437c2
        Events : 0.16110610

   Number   Major   Minor   RaidDevice State
      0       3        3        0      active sync   /dev/hda3
      1      22        3        1      active sync   /dev/hdc3
      2       8        3        2      active sync   /dev/sda3
      3       8       19        3      active sync   /dev/sdb3



Anyone know why i get this error?

Thanks
--
karl
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