Gluster users - Apr 2017 - how to change a default option for all new volumes ?

Hi,
We see an issue when using a volume that has the default option  set
performance.write-behind so have been running

gluster volume set xxxx  performance.write-behind off

manually, how would I go about forcing all new volumes to have that set ? we are
trying to use heketi for dynamic volume provisioning but without being able to
set this flag automatically we still have a manual step.

Thanks

Steven
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