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<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in">
<span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#222426">We need storage specifically for HPC Lustre failover setup, where it is must that two servers should share same block level storage to have failover configuration.<o:p></o:p></span></p>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in">
<span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#222426">With very limited knowledge on hardware, I have the below understanding:<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:6.0pt;margin-left:22.5pt;text-indent:-.25in;mso-list:l1 level1 lfo1">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol;color:#222426"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">        
</span></span></span><![endif]><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#222426">NAS can be used for shared storage, but there will be bottleneck for speed due to intermediate network.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:6.0pt;margin-left:22.5pt;text-indent:-.25in;mso-list:l1 level1 lfo1">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol;color:#222426"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">        
</span></span></span><![endif]><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#222426">SAN can be used, but it is costly to implement the solution and not really needed for Storage of 50-100TB.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:6.0pt;margin-left:22.5pt;text-indent:-.25in;mso-list:l1 level1 lfo1">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol;color:#222426"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">        
</span></span></span><![endif]><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#222426">If at all we find multiple iscsi ports to the storage enclosure, the storage can be used only by splitting i.e., works as two storage devices and the
 same storage can't be used by both the<br>
systems. (And one thing to remind here, in the lustre setup, both the servers would be only attached, but only one will be used (not sure, how it is possible, again need to check on this).<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:22.5pt;text-indent:-.25in;mso-list:l1 level1 lfo1">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol;color:#222426"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">        
</span></span></span><![endif]><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#222426">Having two virtual machines may be how we can do it. But, then, it is not really helpful for the purpose of failover, as the physical machine would be
 only one.<o:p></o:p></span></p>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in">
<span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#222426">But, while posting the question, I am thinking, maybe we can compromise on speed in NAS, if we try having one directly attached server (primary) and the other attached via network (failover),
 so we face slowness only when the primary stops working.<o:p></o:p></span></p>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in">
<span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#222426">As I posted the similar question on Server Fault:
<a href="http://serverfault.com/questions/763569/is-it-possible-to-have-a-directly-attached-shared-storage-accessed-at-block-lev">
http://serverfault.com/questions/763569/is-it-possible-to-have-a-directly-attached-shared-storage-accessed-at-block-lev</a>, I have got the following response:</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222426;border:none windowtext 1.0pt;padding:0in"><br>
<span class="comment-copy">“Have you actually attempted to set up a proof of concept, or at least looked through the</span><span class="apple-converted-space"> </span><span class="comment-copy"><a href="http://doc.lustre.org/lustre_manual.xhtml"><span style="color:#005999">documentation</span></a>?
 Lustre really doesn't care very much how you connect to the underlying storage, so you can do whatever gets you the bandwidth you need.”<o:p></o:p></span></span></p>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in">
<span class="comment-copy"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222426;border:none windowtext 1.0pt;padding:0in">So, is it true that we don’t need to worry about bandwidth of the storage server?<o:p></o:p></span></span></p>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in">
<span class="comment-copy"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222426;border:none windowtext 1.0pt;padding:0in">I mean, for example: the communication as I understood is as follows:<o:p></o:p></span></span></p>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;color:#222426"><span style="mso-list:Ignore">è<span style="font:7.0pt "Times New Roman""> 
</span></span></span></span><![endif]><span class="comment-copy"><span style="font-size:10.0pt;border:none windowtext 1.0pt;padding:0in">Client
</span></span><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;border:none windowtext 1.0pt;padding:0in">ß</span></span><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;border:none windowtext 1.0pt;padding:0in">à</span></span><span class="comment-copy"><span style="font-size:10.0pt;border:none windowtext 1.0pt;padding:0in">
 MGS (Ethernet)</span></span><span class="comment-copy"><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#222426"><o:p></o:p></span></span></p>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;color:#222426"><span style="mso-list:Ignore">è<span style="font:7.0pt "Times New Roman""> 
</span></span></span></span><![endif]><span class="comment-copy"><span style="font-size:10.0pt;border:none windowtext 1.0pt;padding:0in">MGS
</span></span><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;border:none windowtext 1.0pt;padding:0in">ß</span></span><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;border:none windowtext 1.0pt;padding:0in">à</span></span><span class="comment-copy"><span style="font-size:10.0pt;border:none windowtext 1.0pt;padding:0in">
 MGT (Direct/ISCSI) </span></span><span class="comment-copy"><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#222426"><o:p></o:p></span></span></p>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;color:#222426"><span style="mso-list:Ignore">è<span style="font:7.0pt "Times New Roman""> 
</span></span></span></span><![endif]><span class="comment-copy"><span style="font-size:10.0pt;border:none windowtext 1.0pt;padding:0in">MGS
</span></span><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;border:none windowtext 1.0pt;padding:0in">ß</span></span><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;border:none windowtext 1.0pt;padding:0in">à</span></span><span class="comment-copy"><span style="font-size:10.0pt;border:none windowtext 1.0pt;padding:0in">
 MDS (Ethernet/Internal Communication)</span></span><span class="comment-copy"><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#222426"><o:p></o:p></span></span></p>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;color:#222426"><span style="mso-list:Ignore">è<span style="font:7.0pt "Times New Roman""> 
</span></span></span></span><![endif]><span class="comment-copy"><span style="font-size:10.0pt;border:none windowtext 1.0pt;padding:0in">MDS
</span></span><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;border:none windowtext 1.0pt;padding:0in">ß</span></span><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;border:none windowtext 1.0pt;padding:0in">à</span></span><span class="comment-copy"><span style="font-size:10.0pt;border:none windowtext 1.0pt;padding:0in">
 MDT (Direct/ISCSI/Ethernet)</span></span><span class="comment-copy"><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#222426"><o:p></o:p></span></span></p>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;color:#222426"><span style="mso-list:Ignore">è<span style="font:7.0pt "Times New Roman""> 
</span></span></span></span><![endif]><span class="comment-copy"><span style="font-size:10.0pt;border:none windowtext 1.0pt;padding:0in">MDS
</span></span><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;border:none windowtext 1.0pt;padding:0in">ß</span></span><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;border:none windowtext 1.0pt;padding:0in">à</span></span><span class="comment-copy"><span style="font-size:10.0pt;border:none windowtext 1.0pt;padding:0in">
 OSS (Ethernet)</span></span><span class="comment-copy"><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#222426"><o:p></o:p></span></span></p>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;color:#222426"><span style="mso-list:Ignore">è<span style="font:7.0pt "Times New Roman""> 
</span></span></span></span><![endif]><span class="comment-copy"><span style="font-size:10.0pt;border:none windowtext 1.0pt;padding:0in">OSS
</span></span><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;border:none windowtext 1.0pt;padding:0in">ß</span></span><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;border:none windowtext 1.0pt;padding:0in">à</span></span><span class="comment-copy"><span style="font-size:10.0pt;border:none windowtext 1.0pt;padding:0in">
 OST (Direct/ISCSI/Ethernet) </span></span><span class="comment-copy"><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#222426"><o:p></o:p></span></span></p>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Wingdings;color:#222426"><span style="mso-list:Ignore">è<span style="font:7.0pt "Times New Roman""> 
</span></span></span><![endif]><span class="comment-copy"><span style="font-size:10.0pt;border:none windowtext 1.0pt;padding:0in">OST
</span></span><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;border:none windowtext 1.0pt;padding:0in">ß</span></span><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;border:none windowtext 1.0pt;padding:0in">à</span></span><span class="comment-copy"><span style="font-size:10.0pt;border:none windowtext 1.0pt;padding:0in">
 Client (Ethernet) </span></span><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#222426"><o:p></o:p></span></p>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in">
<span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#222426">Does it mean that, the performance won’t be affected at any stage, if iscsi is replaced by Ethernet or by using limited bandwidth?
<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;color:#2E74B5">Thanks and Regards,<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="color:#C45911">Jeevan Patnaik B</span></b><b><span style="color:#2E74B5">
</span></b><span style="color:#2E74B5">| </span><span style="color:#BF8F00">Project Engineer</span><span style="color:#2E74B5">
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#002060">Nokia IT - HEE Platform</span><span style="color:#2E74B5"> |
</span><span style="color:#2F5496">WIPRO Technologies - Hyderabad</span><span style="color:#2E74B5"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#7F7F7F">Mob: +91-9000607181</span><span style="color:#2E74B5">
</span><span style="color:#7F7F7F">| Off: +91-4030970347.</span><span style="color:black">
</span><span style="color:#2E74B5"><o:p></o:p></span></p>
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