I had posted at the Sun forums, but it was recommended to me to try here as 
well.  For reference, please see 
http://forums.sun.com/thread.jspa?threadID=5351916&tstart=0.

In the process of a large SAN migration project we are moving many large 
volumes from the old SAN to the new. We are making use of the 'replace' 
function to replace the old volumes with similar or larger new volumes. This 
process is moving very slowly, sometimes as slow as only moving one percentage 
of data every 10 minutes. Is there any way to streamline this method? The 
system is Solaris 10 08/07. How much is dependent on the activity of the box? 
How about on the architecture of the box? The primary system in question at 
this point is a T2000 with 8GB of RAM and a 4-core CPU. This server has 6 4Gb 
fibre channel connections to our SAN environment. At times this server is quite 
busy because it is our backup server, but performance seems no better when 
backup operations have ceased their daily activities.

Our pools are only stripes. Would we expect better performance from a mirror or 
raidz pool? It is worrisome that if the environment were compromised by a 
failed disk that it could take so long to replace and correct the usual 
redundancies (if it was a mirror or raidz pool). 

I have previously applied the kernel change described here: 
http://blogs.digitar.com/jjww/?itemid=52

I just moved a 1TB volume which took approx. 27h.
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