You should look at your disk IO patterns which will likely lead you to find
unset IO queues in sd.conf. Look at this
http://blogs.sun.com/chrisg/entry/latency_bubble_in_your_io as a place to
start. The parameter you can try to set globally (bad idea) is done by doing
echo zfs_vdev_max_pending/W0t2 | mdb -kw. The old default value was 35, and the
new one is 10. On my LSI 9211-8i with 16 SATA disks, I found the ideal value to
be 2 for our workload.
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