I was interested as well, so I ran this command:

I also was interested, and did mdadm -X /dev/md0, and this is my output...

mdadm -X /dev/md0
        Filename : /dev/md0
           Magic : 00000000
mdadm: invalid bitmap magic 0x0, the bitmap file appears to be corrupted
         Version : 0
mdadm: unknown bitmap version 0, either the bitmap file is corrupted or you
need to upgrade your tools



mdadm --version
mdadm - v3.0.3 - 22nd October 2009


uname -a
Linux file00bert.woodlea.org.uk 2.6.32.12-115.fc12.i686.PAE #1 SMP Fri Apr
30 20:14:08 UTC 2010 i686 i686 i386 GNU/Linux

cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] 
md0 : active raid6 sdh1[0] sda1[14] sdp1[13] sdg1[12] sdo1[11] sdf1[10]
sdk1[9] sdn1[8] sde1[7] sdj1[6] sdm1[5] sdd1[4] sdi1[3] sdl1[2] sdc1[1]
      6348985344 blocks super 1.2 level 6, 512k chunk, algorithm 2 [15/15]
[UUUUUUUUUUUUUUU]
      bitmap: 0/2 pages [0KB], 131072KB chunk

unused devices: <none>