On Sat, Apr 15, 2017 at 7:19 PM, Gandalf Corvotempesta
<gandalf.corvotempe...@gmail.com> wrote:
> Il 15 apr 2017 5:48 PM, "John Spray" <jsp...@redhat.com> ha scritto:
>
> MDSs do not replicate to one another.  They write all metadata to a
> RADOS pool (i.e. to the OSDs), and when a failover happens, the new
> active MDS reads the metadata in.
>
>
> Is MDS atomic? A successful ack is sent only after data is properly wrote on
> radios pool or is wrote in background

Your client mount gives you POSIX semantics -- it obeys the normal
rules around fsync, etc.

John
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