On Oct 24, 2006, at 3:23 PM, Frank Cusack wrote:
<http://blogs.sun.com/roch/entry/when_to_and_not_to> says a raid-z vdev has the read throughput of 1 drive for random reads. Compared to #drives for a stripe. That's pretty significant.
Okay, then if the person can stand to lose even more space, do zfs mirroring on each JBOD. Then we'd have a mirror of mirrors instead of a mirror of raidz's.
Remember, the OP wanted chassis-level redundancy as well as redundancy within the domain of each chassis. You can't do that now with ZFS unless you combine ZFS with SVM.
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