[gpfsug-discuss] Data Replication

[Brian Marshall]

Thanks.   This confirms the numbers that I am seeing.

Brian

On Tue, Aug 30, 2016 at 2:50 PM, Laurence Horrocks-Barlow <
laurence at qsplace.co.uk> wrote:

> 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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