ZFS in FreeBSD 8.0 has been deemed production-quality, and the experimental tag has been removed. It's also updated to ZFSv13.
We're using ZFSv6 on FreeBSD 7.2 without issues. We push between 200 and 300 MB/sec (write) through to our disks (granted, we have 24 SATA drives configured in 3 8-disk raidz2 vdevs).
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Freddie
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