<html><head><META http-equiv="Content-Type" content="text/html;charset=utf-8"></head><body><div id="content" contenteditable="true" spellcheck="true" autocorrect="true" autocapitalize="true" style="font-family: Helvetica;">The other 'Exception' is when a rule is used to convert a 1 way replicated file to 2 way, or when only one failure group is up due to HW problems. It that case the (re-replication) is done by whatever nodes are used for the rule or command-line, which may include an NSD server.<br><br>Daniel<br><br>IBM Spectrum Storage Software<br><a dir="ltr" href="tel:+44%207818%20522266" x-apple-data-detectors="true" x-apple-data-detectors-type="telephone" x-apple-data-detectors-result="0">+44 (0)7818 522266</a><br>Sent from my iPad using IBM Verse<br><br><br><hr>On 30 Aug 2016, 19:53:31, mimarsh2@vt.edu wrote:<br><br>From: mimarsh2@vt.edu<br>To: gpfsug-discuss@spectrumscale.org<br>Cc: <br>Date: 30 Aug 2016 19:53:31<br>Subject: Re: [gpfsug-discuss] Data Replication<br><br><div id="MaaS360PIMSDKOriginalMessageId"><div dir="ltr">Thanks. This confirms the numbers that I am seeing.<div><br></div><div>Brian</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Aug 30, 2016 at 2:50 PM, Laurence Horrocks-Barlow <span dir="ltr"><<a href="mailto:laurence@qsplace.co.uk" target="_blank">laurence@qsplace.co.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="purple">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).<br><br>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.<br><br>-- Lauz<br><br><div class="gmail_quote"><div><div class="h5">On 30 August 2016 17:03:38 CEST, Bryan Banister <<a href="mailto:bbanister@jumptrading.com" target="_blank">bbanister@jumptrading.com</a>> wrote:</div></div><blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div class="h5">
<div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">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).</span></p><p></p><p></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Cheers,</span></p><p></p><p></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">-Bryan</span></p><p></p><p></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"></span></p><p> </p><p></p><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:gpfsug-discuss-bounces@spectrumscale.org" target="_blank">gpfsug-discuss-bounces@<wbr>spectrumscale.org</a> [mailto:<a href="mailto:gpfsug-discuss-bounces@spectrumscale.org" target="_blank">gpfsug-discuss-<wbr>bounces@spectrumscale.org</a>]
<b>On Behalf Of </b>Brian Marshall<br><b>Sent:</b> Tuesday, August 30, 2016 9:59 AM<br><b>To:</b> gpfsug main discussion list<br><b>Subject:</b> [gpfsug-discuss] Data Replication</span></p><p></p><p></p><p class="MsoNormal"></p><p> </p><div><p class="MsoNormal">All,</p><p></p><div><p class="MsoNormal"></p><p> </p></div><div><p class="MsoNormal">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?</p><p></p></div><div><p class="MsoNormal"></p><p> </p></div><div><p class="MsoNormal">I couldn't find a place in the docs that talked about this specific point.</p><p></p></div><div><p class="MsoNormal"></p><p> </p></div><div><p class="MsoNormal">Thank you,</p><p></p></div><div><p class="MsoNormal">Brian Marshall</p><p></p></div></div></div><br><hr><font face="Arial" color="Gray" size="1"><br>Note: This email is for the confidential use of the named addressee(s) only and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you are hereby notified that any review, dissemination or copying of this
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