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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">This is where my confusion sits. So if I have two sites, and two NDS Nodes per site with 1 NSD (to keep it simple), do I just present the physical LUN in Site1 to Site1 NDS Nodes and physical
LUN in Site2 to Site2 NSD Nodes? Or is it that I present physical LUN in Site1 to all 4 NDS Nodes and the same at Site2? (Assuming SAN and not direct attached in this case). I know I’m being persistent but this for some reason confuses me.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Site1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">NSD Node1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"> ---NSD1 ---Physical LUN1 from SAN1
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">NSD Node2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Site2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">NSD Node3
<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;text-indent:.5in"><span style="font-size:11.0pt;font-family:Calibri">---NSD2 –Physical LUN2 from SAN2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">NSD Node4<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Or <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Site1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">NSD Node1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"> ----NSD1 –Physical LUN1 from SAN1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"> ----NSD2 –Physical LUN2 from SAN2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">NSD Node2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Site 2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">NSD Node3
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"> ---NSD2 – Physical LUN2 from SAN2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"> ---NSD1 --Physical LUN1 from SAN1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">NSD Node4<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Site 3<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Node5 Quorum<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-family:Calibri;color:black">From: </span>
</b><span style="font-family:Calibri;color:black"><gpfsug-discuss-bounces@spectrumscale.org> on behalf of Ken Hill <kenh@us.ibm.com><br>
<b>Reply-To: </b>gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><br>
<b>Date: </b>Wednesday, July 20, 2016 at 7:02 PM<br>
<b>To: </b>gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><br>
<b>Subject: </b>Re: [gpfsug-discuss] NDS in Two Site scenario<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"sans-serif","serif"">Yes - it is a cluster.</span><br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">The sites should NOT be further than a MAN - or Campus network. If you're looking to do this over a large distance - it would be best to choose another GPFS solution (Multi-Cluster, AFM, etc).</span><br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">Regards,</span><br>
<br>
<b><span style="font-family:Arial;color:#8F8F8F">Ken Hill</span></b><span style="font-size:10.0pt;font-family:Arial"><br>
Technical Sales Specialist | Software Defined Solution Sales<br>
IBM Systems</span> <o:p></o:p></p>
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<span style="font-size:7.5pt;font-family:Arial"><br>
2300 Dulles Station Blvd<br>
Herndon, VA 20171-6133<br>
United States</span><o:p></o:p></p>
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<span style="font-size:7.5pt;font-family:"sans-serif","serif";color:#5F5F5F">From: </span><span style="font-size:7.5pt;font-family:"sans-serif","serif"">"Mark.Bush@siriuscom.com" <Mark.Bush@siriuscom.com></span><br>
<span style="font-size:7.5pt;font-family:"sans-serif","serif";color:#5F5F5F">To: </span><span style="font-size:7.5pt;font-family:"sans-serif","serif"">gpfsug main discussion list <gpfsug-discuss@spectrumscale.org></span><br>
<span style="font-size:7.5pt;font-family:"sans-serif","serif";color:#5F5F5F">Date: </span><span style="font-size:7.5pt;font-family:"sans-serif","serif"">07/20/2016 07:33 PM</span><br>
<span style="font-size:7.5pt;font-family:"sans-serif","serif";color:#5F5F5F">Subject: </span><span style="font-size:7.5pt;font-family:"sans-serif","serif"">Re: [gpfsug-discuss] NDS in Two Site scenario</span><br>
<span style="font-size:7.5pt;font-family:"sans-serif","serif";color:#5F5F5F">Sent by: </span><span style="font-size:7.5pt;font-family:"sans-serif","serif"">gpfsug-discuss-bounces@spectrumscale.org</span><o:p></o:p></p>
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<span style="font-size:10.0pt;font-family:Calibri">So in this scenario Ken, can server3 see any disks in site1? </span><br>
<span style="font-size:10.0pt;font-family:Calibri"> </span><br>
<b><span style="font-family:Calibri">From: </span></b><span style="font-family:Calibri"><gpfsug-discuss-bounces@spectrumscale.org> on behalf of Ken Hill <kenh@us.ibm.com><b><br>
Reply-To: </b>gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><b><br>
Date: </b>Wednesday, July 20, 2016 at 4:15 PM<b><br>
To: </b>gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><b><br>
Subject: </b>Re: [gpfsug-discuss] NDS in Two Site scenario</span><br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif""><br>
Site1 Site2<br>
Server1 (quorum 1) Server3 (quorum 2)<br>
Server2 Server4</span><br>
<br>
<br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif""><br>
SiteX <br>
Server5 (quorum 3)</span><br>
<br>
<br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif""><br>
You need to set up another site (or server) that is at least power isolated (if not completely infrastructure isolated) from Site1 or Site2. You would then set up a quorum node at that site | location. This insures you can still access your data even if one
of your sites go down.</span><br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif""><br>
You can further isolate failure by increasing quorum (odd numbers).</span><br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif""><br>
The way quorum works is: The majority of the quorum nodes need to be up to survive an outage.<br>
<br>
- With 3 quorum nodes you can have 1 quorum node failures and continue filesystem operations.<br>
- With 5 quorum nodes you can have 2 quorum node failures and continue filesystem operations.<br>
- With 7 quorum nodes you can have 3 quorum node failures and continue filesystem operations.<br>
- etc</span><br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif""><br>
Please see </span><a href="http://www.ibm.com/support/knowledgecenter/en/STXKQY_4.2.0/ibmspectrumscale42_content.html?view=kc"><span style="font-size:10.0pt;font-family:"sans-serif","serif"">http://www.ibm.com/support/knowledgecenter/en/STXKQY_4.2.0/ibmspectrumscale42_content.html?view=kc</span></a><span style="font-size:10.0pt;font-family:"sans-serif","serif"">for
more information about quorum and tiebreaker disks.</span><br>
<b><span style="font-family:Arial;color:#8F8F8F"><br>
Ken Hill</span></b><span style="font-size:10.0pt;font-family:Arial"><br>
Technical Sales Specialist | Software Defined Solution Sales<br>
IBM Systems</span> <o:p></o:p></p>
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E-mail:</span></b></span><span style="font-family:Arial"> </span><a href="mailto:kenh@us.ibm.com" target="_blank"><span style="font-size:7.5pt;font-family:Arial;color:#5F5F5F">kenh@us.ibm.com</span></a><o:p></o:p></p>
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<br>
2300 Dulles Station Blvd<br>
Herndon, VA 20171-6133<br>
United States</span><o:p></o:p></p>
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<span style="font-size:7.5pt;font-family:"sans-serif","serif";color:#5F5F5F"><br>
From: </span><span style="font-size:7.5pt;font-family:"sans-serif","serif"">"Mark.Bush@siriuscom.com" <Mark.Bush@siriuscom.com><span style="color:#5F5F5F"><br>
To: </span>gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><span style="color:#5F5F5F"><br>
Date: </span>07/20/2016 04:47 PM<span style="color:#5F5F5F"><br>
Subject: </span>[gpfsug-discuss] NDS in Two Site scenario<span style="color:#5F5F5F"><br>
Sent by: </span>gpfsug-discuss-bounces@spectrumscale.org</span><o:p></o:p></p>
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For some reason this concept is a round peg that doesn’t fit the square hole inside my brain. Can someone please explain the best practice to setting up two sites same cluster? I get that I would likely have two NDS nodes in site 1 and two NDS nodes in site
two. What I don’t understand are the failure scenarios and what would happen if I lose one or worse a whole site goes down. Do I solve this by having scale replication set to 2 for all my files? I mean a single site I think I get it’s when there are two
datacenters and I don’t want two clusters typically.</span><span style="font-size:10.0pt;font-family:MingLiU"><br>
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</span><span style="font-size:10.0pt;font-family:Calibri;color:#002F80"><br>
Mark R. Bush</span><span style="font-size:10.0pt;font-family:Calibri">| Solutions Architect<br>
Mobile: 210.237.8415 | mark.bush@siriuscom.com<br>
Sirius Computer Solutions | </span><a href="http://www.siriuscom.com/"><span style="font-size:10.0pt;font-family:Calibri">www.siriuscom.com</span></a><span style="font-size:10.0pt;font-family:Calibri"><br>
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