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...;ve added memory; this was an improvement, but the incidents continued. The next step is to disable ZFS prefetch and test this under load. If that doesn''t help either, we''re down to ZFS bugs. Our incidents seem similar to the ones at UC Davis: http://vpiet.ucdavis.edu/docs/EmailReviewCmte.Report_Feb2008.pdf These were attributed to bug 6535160, but this one is fixed on our server with patch 127127-11. Bug 6535172, ``zil_sync causing long hold times on zl_lock'''', doesn''t have a patch yet: http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=653...