Gluster users - Sep 2014 - Mirroring in GlusterFS

Hello.

I'm wondering, how is the actual mirroring done in Gluster? Is client
responsible for creating two copies of data? If yes, does it perform two
writes in parallel (to two bricks) or in sequential manner?

Or, maybe, it is server's responsibility - to make a copy from each write
request?

 

Thank you for your opinions.

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On Wed, Sep 17, 2014 at 03:25:49PM +0300, Sergei wrote:
> Hello.
> 
> I'm wondering, how is the actual mirroring done in Gluster? Is client
> responsible for creating two copies of data? If yes, does it perform two
> writes in parallel (to two bricks) or in sequential manner?
This is correct, the mirroring (we call it "replication") is done on
the
client-side. One write by an application/user will result in multiple
parallel writes to the bricks.
> Or, maybe, it is server's responsibility - to make a copy from each
write
> request?
No, it is not. In case of mounting a Gluster volume over NFS, the
NFS-server acts as a GlusterFS-client. Here, the NFS-server is
responsible for the replication (not the NFS-client).

Niels