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. -- This message posted from opensolaris.org