Cody Yellan wrote:

I had a 4x500GB SATA2 array, md0.  I added one 500GB drive and
reshaping began at ~2500K/sec.  Changing
/proc/sys/dev/raid/speed_limit_m{in,ax} or
/sys/block/md0/md/sync_speed_m{in,ax} had no effect.  I shut down all
unnecessary services and the array is offline (not mounted).  I have
read that the throttling code is "fragile" (esp. with regard to
raid5) but does this make sense?  I will wait (in)patiently for it to
finish, but I do wonder why the configuration parameters have no
effect.  This is a dual quad 2GHz Xeon machine with 8GB of memory
running RHEL5.  Is this the maximum speed?
  

Something else going on, I do better than that adding drives on USB!

I don't have a clue what the issue is, and I don't see anything in your 
information which looks unusual.

-- 
Bill Davidsen [off-list ref]
  "Woe unto the statesman who makes war without a reason that will still
  be valid when the war is over..." Otto von Bismark