>sync=disabled
>        Synchronous requests are disabled.  File system transactions
>        only commit to stable storage on the next DMU transaction group
>        commit which can be many seconds.  This option will give the
>        highest performance.  However, it is very dangerous as ZFS
>        would be ignoring the synchronous transaction demands of
>        applications such as databases or NFS.  Administrators should
>        only use this when these risks are understood.

Is there a partialy order defined for all filesystem operations?

Specifically, will ZFS guarantee that when fsync()/O_DATA happens on a file,
that later transactions will not be in an earlier transaction group?
(Or is this already the case?)

Casper
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