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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">So in this scenario Ken, can server3 see any disks in site1?
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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 4:15 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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<span style="font-size:10.0pt;font-family:"sans-serif","serif""> Site1 Site2</span><br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif""> Server1 (quorum 1) Server3 (quorum 2)</span><br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif""> Server2 Server4</span><br>
<br>
<br>
<br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif""> SiteX
</span><br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif""> Server5 (quorum 3)</span><br>
<br>
<br>
<br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">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>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">You can further isolate failure by increasing quorum (odd numbers).</span><br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">The way quorum works is: The majority of the quorum nodes need to be up to survive an outage.</span><br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif""> </span><br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">- With 3 quorum nodes you can have 1 quorum node failures and continue filesystem operations.</span><br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">- With 5 quorum nodes you can have 2 quorum node failures and continue filesystem operations.</span><br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">- With 7 quorum nodes you can have 3 quorum node failures and continue filesystem operations.</span><br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">- etc</span><br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">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>
<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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<p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:Arial;color:#4181C0">Phone:</span></b><span style="font-size:7.5pt;font-family:Arial">1-540-207-7270<b><span style="color:#4181C0"><br>
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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<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 04:47 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"">[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">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><br>
<span style="font-size:10.0pt;font-family:Calibri"> </span><br>
<span style="font-size:10.0pt;font-family:Calibri"> </span><br>
<span style="font-size:10.0pt;font-family:Calibri"> </span><br>
<span style="font-size:10.0pt;font-family:Calibri;color:#002F80">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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