IIRC, one of the big bugs in b134 is in ZFS dedup and it causes data loss. You might check the archives.

On 07/22/10 14:41, Giovanni Tirloni wrote:
On Thu, Jul 22, 2010 at 5:23 PM, Stephan Ferraro<step...@ferraro.net>  wrote:
I would like to upgrade at my hosting service Hetzner on snv134 the zpool to be 
able to use the dedup functions.
But unfortunately Hetzner uses an old rescue system (snv111b). Is there a 
possibility to mount ZFS partitions from snv111b if zpool is upgraded to latest 
version of snv134?
The practical answer is probably no.

You could try to backport the current code to b111. I don't think it's
worth the effort since later builds seem more polished.

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