Some more insight:

I have the following zpools setup:
aaa_zvol: 2 250GB IDE in Raid0

storage raidZ1:
   1 500 GB IDE
   1 500 GB SATA
   /..../aaa_zvol/aaa_zvol (the zvol exported from the aaa_zvol pool)

When I run the array in a degraded mode, ie place one of the drives in the 
offline state, the kernel doesn't seem to spike. When I put the offline drive 
online and resliver, the 100% kernel usage appears when transferring from the 
network to the full operational array. 

I remove each of the drives in turn and tried this experiment, so it doesn't 
seem to be down to a specific drive/interface. 

I wonder if using a zvol as part of a raidz is an issue?

Also, cross-posting to ZFS list.
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