On Sunday May 13, [EMAIL PROTECTED] wrote:
> 
> 
> Hello all,
> 
> I just set up a new raid 5 array of 4 750G disks and am having a strange
> experience where /proc/mdstat is showing that one device is missing from the
> array.  The output from a "--detail" shows that there is some unnamed device
> that has been removed from the array and I don't understand why or how to fix
> it.  Can someone please shed some light?

A raid5 is always created with one missing device and one spare.  This
is because recovery onto a spare is faster than resync of a brand new
array.

The real problem here is that recovery has not started.
If you 
  mdadm -S /dev/md2
  mdadm -A /dev/md2 /dev/sd[def]
  mdadm /dev/md2 -a /dev/sdg
it will start recovery.

This bug was fixed in mdadm-2.5.2

NeilBrown
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