software raid resyncing

[urgrue <urgrue@xxxxxxxxx>]

ive set up a software raid. md0 and md1 are RAID-0 (two identical SATA 
drives on each) and md2 is a RAID-1 consisting of md0 and md1. 
it works, but:
Personalities : [linear] [raid0] [raid1] [raid5] read_ahead 1024 sectors
md2 : active raid1 md1[1] md0[0]
      490223168 blocks [2/2] [UU]
      [========>............]  resync = 43.6% (213810348/490223168) 
finish=18185.0min speed=252K/sec
md1 : active raid0 sdd1[1] [dev 08:21][0]
      490223232 blocks 32k chunks
      md0 : active raid0 sdb1[1] [dev 08:01][0]
      490223232 blocks 32k chunks

and mdadm --detail /dev/md2  shows md2:
          State : dirty, resyncing
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0
 Rebuild Status : 43% complete

question 1: why is it dirty? i just set this up a few days ago. should 
i be concerned, is something faulty? the individual RAID-0 drives md0 
and md1 report nothing out of the ordinary.

question 2: why is it piddling along at 252K/sec? at this rate resync 
will take weeks.
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