I think we found the choke point. The silver lining is that it isn't the T2000
or ZFS. We think it is the new SAN, an Hitachi AMS1000, which has 7200RPM SATA
disks with the cache turned off. This system has a very small cache, and when
we did turn it on for one of the replacement LUNs we saw a 10x improvement -
until the cache filled up about 1 minute later (was using zpool iostat). Oh
well.
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