On Thu, 12 May 2011 19:59:01 -0500 "Leslie Rhorer" [off-list ref]
wrote:

I read through the man page for mdadm a couple of times and did not spot how
to do this.  I currently have a RAID array that I need to upgrade from 1T
drives to 3T drives.  To accomplish this, I intend to create a larger array,
but with fewer spindles, and then rsync the contents of the old array to the
new.  Once I am done, I then want to stop the old array (/dev/md0) and start
up the new array under /dev/md0.  Do I have to stop the array and then
re-create it with all the same parameters, except the device target?

For v0.90:  --update=super-minor
For v1.x    --update=name

NeilBrown