<br><font size=2 face="sans-serif">
Site1
Site2</font><br><font size=2 face="sans-serif">
Server1 (quorum 1)
Server3 (quorum 2)</font><br><font size=2 face="sans-serif">
Server2
Server4</font><br><br><br><br><br><font size=2 face="sans-serif">
SiteX </font><br><font size=2 face="sans-serif">
Server5 (quorum 3)</font><br><br><br><br><br><font size=2 face="sans-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.</font><br><br><font size=2 face="sans-serif">You can further isolate failure by increasing
quorum (odd numbers).</font><br><br><font size=2 face="sans-serif">The way quorum works is: The majority
of the quorum nodes need to be up to survive an outage.</font><br><font size=2 face="sans-serif"> </font><br><font size=2 face="sans-serif">- With 3 quorum nodes you can have 1
quorum node failures and continue filesystem operations.</font><br><font size=2 face="sans-serif">- With 5 quorum nodes you can have 2
quorum node failures and continue filesystem operations.</font><br><font size=2 face="sans-serif">- With 7 quorum nodes you can have 3
quorum node failures and continue filesystem operations.</font><br><font size=2 face="sans-serif">- etc</font><br><br><font size=2 face="sans-serif">Please see </font><a href="http://www.ibm.com/support/knowledgecenter/en/STXKQY_4.2.0/ibmspectrumscale42_content.html?view=kc"><font size=2 color=blue face="sans-serif">http://www.ibm.com/support/knowledgecenter/en/STXKQY_4.2.0/ibmspectrumscale42_content.html?view=kc</font></a><font size=2 face="sans-serif">for more information about quorum and tiebreaker disks.</font><br><br><font size=3 color=#8f8f8f face="Arial"><b>Ken Hill</b></font><font size=2 face="Arial"><br>Technical Sales Specialist | Software Defined Solution Sales<br>IBM Systems</font><p><table width=776 style="border-collapse:collapse;"><tr height=8><td width=776 colspan=3 style="border-style:none none none none;border-color:#000000;border-width:0px 0px 0px 0px;padding:0px 0px;"><hr><tr height=8><td width=159 style="border-style:none none none none;border-color:#000000;border-width:0px 0px 0px 0px;padding:0px 0px;"><font size=1 color=#4181c0 face="Arial"><b>Phone:</b></font><font size=3 face="Arial"></font><font size=1 face="Arial">1-540-207-7270</font><font size=1 color=#4181c0 face="Arial"><b><br>E-mail:</b></font><font size=3 face="Arial"> </font><a href=mailto:kenh@us.ibm.com target=_blank><font size=1 color=#5f5f5f face="Arial"><u>kenh@us.ibm.com</u></font></a><td width=616 style="border-style:none none none none;border-color:#000000;border-width:0px 0px 0px 0px;padding:0px 0px;"><div align=right><a href="http://www.ibm.com/us-en/"><img src=cid:_4_C7567E88C75678D80074CD7E85257FF6 style="border:0px solid;"></a><font size=3>
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<br></font><font size=1 face="Arial"><br>2300 Dulles Station Blvd<br>Herndon, VA 20171-6133<br>United States</font></div><td width=6 valign=top style="border-style:none none none none;border-color:#000000;border-width:0px 0px 0px 0px;padding:0px 0px;"></table><br><br><br><br><br><br><font size=1 color=#5f5f5f face="sans-serif">From:
</font><font size=1 face="sans-serif">"Mark.Bush@siriuscom.com"
<Mark.Bush@siriuscom.com></font><br><font size=1 color=#5f5f5f face="sans-serif">To:
</font><font size=1 face="sans-serif">gpfsug main discussion
list <gpfsug-discuss@spectrumscale.org></font><br><font size=1 color=#5f5f5f face="sans-serif">Date:
</font><font size=1 face="sans-serif">07/20/2016 04:47 PM</font><br><font size=1 color=#5f5f5f face="sans-serif">Subject:
</font><font size=1 face="sans-serif">[gpfsug-discuss]
NDS in Two Site scenario</font><br><font size=1 color=#5f5f5f face="sans-serif">Sent by:
</font><font size=1 face="sans-serif">gpfsug-discuss-bounces@spectrumscale.org</font><br><hr noshade><br><br><br><font size=2 face="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.</font><br><font size=2 face="Calibri"> </font><br><font size=2 face="Calibri"> </font><br><font size=2 face="Calibri"> </font><br><font size=2 color=#002f80 face="Calibri">Mark R. Bush</font><font size=2 face="Calibri">| Solutions Architect<br>Mobile: 210.237.8415 | mark.bush@siriuscom.com<br>Sirius Computer Solutions | </font><a href=http://www.siriuscom.com/><font size=2 color=blue face="Calibri"><u>www.siriuscom.com</u></font></a><font size=2 face="Calibri"><br>10100 Reunion Place, Suite 500, San Antonio, TX 78216 </font><br><font size=3 face="Calibri"> </font><p><font size=1 face="Cambria">This message (including any attachments)
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