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From: Pieter Donche <Pieter.Donche@ua.ac.be>
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Subject: raid tool ZFS RAID-Z2 (RAID6)
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raidz is available for Freebsd through the file system format ZFS
and is similar to RAID-5.

Is that in FreeBSD 7.0 Production release?

But there is also RAID-Z2 which uses two forms of parity to achieve
results similar to RAID6: the ability to sustain up to two drive
failures without losing data..

Does Freebsd 7.0 production release also support raid-z2?