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I have a running freenas zfs on raid-z1. For safety i though of increasing parity. Enough spare space is available.

Is it possible to upgrade a zfs raid-z1 to raid-z2 or raid-z3?

thx for your help

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No, this isn't possible. – ewwhite Mar 14 '14 at 19:47
up vote 4 down vote accepted

Unfortunately, no; you cannot re-shape a RAID-Z group to a different level of RAID-Z, you'd need to move the data elsewhere and add the disks to the pool with the desired level at the time of creation.

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in times of distributed filesystems and stuff like cassandra this is somehow a missing feature ... but as I read it may be implemented in future verions – Manuel Mar 14 '14 at 20:14

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