What does vmstat look like ?
Also zpool iostat 1.
Do you have any disk based swap ?
One best practice we probably will be coming out with is to
configure at least physmem of swap with ZFS (at least as of
this release).
The partly hung system could be this :
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6429205
6429205 each zpool needs to monitor it's throughput and throttle heavy
writers
The fix state is "in-progress".
What throughput do you get for the full untar (untared size / elapse time) ?
-r
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