[gpfsug-discuss] Data Replication

[Laurence Horrocks-Barlow]

Its the client that does all the synchronous replication, this way the cluster is able to scale as the clients do the leg work (so to speak).

The somewhat "exception" is if a GPFS NSD server (or client with direct NSD) access uses a server bases protocol such as SMB, in this case the SMB server will do the replication as the SMB client doesn't know about GPFS or its replication; essentially the SMB server is the GPFS client.

-- Lauz

On 30 August 2016 17:03:38 CEST, Bryan Banister <bbanister at jumptrading.com> wrote:
>The NSD Client handles the replication and will, as you stated, write
>one copy to one NSD (using the primary server for this NSD) and one to
>a different NSD in a different GPFS failure group (using quite likely,
>but not necessarily, a different NSD server that is the primary server
>for this alternate NSD).
>Cheers,
>-Bryan
>
>From: gpfsug-discuss-bounces at spectrumscale.org
>[mailto:gpfsug-discuss-bounces at spectrumscale.org] On Behalf Of Brian
>Marshall
>Sent: Tuesday, August 30, 2016 9:59 AM
>To: gpfsug main discussion list
>Subject: [gpfsug-discuss] Data Replication
>
>All,
>
>If I setup a filesystem to have data replication of 2 (2 copies of
>data), does the data get replicated at the NSD Server or at the client?
>i.e. Does the client send 2 copies over the network or does the NSD
>Server get a single copy and then replicate on storage NSDs?
>
>I couldn't find a place in the docs that talked about this specific
>point.
>
>Thank you,
>Brian Marshall
>
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