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zfs performance in 2009.06 has some very serious problems, particularly with zvols.

Do you have references and pointers? Is this going to hurt me when I put two non-storage servers live running 2009.06?

You can find a number of them on the opensolaris forums if you search on terms like 0906 iscsi, comstar 0906, etc... here's an example: http://opensolaris.org/jive/thread.jspa?threadID=104593&...

Our experience was that 0906 was utterly unusable if you're using comstar, with performance being mildly degraded for straight zfs usage.