David - Zfs performance variations over nfs

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Hi Allan and Benedict,

I'm new to the world of zfs and have been experimenting with zfs and have found that NFS and Rsync is extremely slow. taking 5 minutes to copy 300 m/b over a gigabit link. Looking at the free bsd documentation it advises setting sync=disabled on the pool dataset. This makes the Rsync finish in 30 seconds writing to a new directory so that it is sending all the files agian and not skipping ones that already exist on the destination. Is utilizing this parameter dangerous if both the server, networking, and workstation is on ups's incase of a power outage. Is there something that I'm missing?

Cheers,
David
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