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<div>You'll only go as fast as your slowest piece.</div>
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<div>With that in mind, First figure out what sorts of bandwidth you can actually get across your chosen network type (per server). That will dictate how fast you want your storage to be. Benchmark it, make sure you can get the I/O over the wire that you
think you can for that one server.</div>
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<div>Next, find a disk system that can deliver that speed for you (you'll be able to get some of the info, but you'll want to benchmark that as well, with different RAID configurations, settings, etc.). You may want to overprovision storage speed, since you
probably won't be getting ideal throughput numbers.</div>
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<div>As to redundancy, there are a number of direct-attach systems that allow you to connect two servers to the same set of disks. You don't need (or really want) anything fancy like a SAN.</div>
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<div>Given the cost/performance ratios, you might also experiment with a few smaller OSTs made up of SSDs, or using something like flashcache on the MDT(s).</div>
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<div>-Ben Evans</div>
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<span style="font-weight:bold">From: </span>lustre-discuss <<a href="mailto:lustre-discuss-bounces@lists.lustre.org">lustre-discuss-bounces@lists.lustre.org</a>> on behalf of "<a href="mailto:jeevan.patnaik@wipro.com">jeevan.patnaik@wipro.com</a>" <<a href="mailto:jeevan.patnaik@wipro.com">jeevan.patnaik@wipro.com</a>><br>
<span style="font-weight:bold">Date: </span>Monday, March 14, 2016 at 8:36 AM<br>
<span style="font-weight:bold">To: </span>"<a href="mailto:lustre-discuss@lists.lustre.org">lustre-discuss@lists.lustre.org</a>" <<a href="mailto:lustre-discuss@lists.lustre.org">lustre-discuss@lists.lustre.org</a>><br>
<span style="font-weight:bold">Subject: </span>[lustre-discuss] Lustre failover configuration - Need help in selecting storage<br>
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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: 10pt; color: rgb(34, 36, 38);"><span style="mso-list:Ignore">·<span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: '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: 10pt; color: rgb(34, 36, 38);"><span style="mso-list:Ignore">·<span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: '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: 10pt; color: rgb(34, 36, 38);"><span style="mso-list:Ignore">·<span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: '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>
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<!--[if !supportLists]--><span style="font-size: 10pt; color: rgb(34, 36, 38);"><span style="mso-list:Ignore">·<span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: '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>
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<!--[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-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: '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-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: '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-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: '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-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: '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-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: '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-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: '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>
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<!--[if !supportLists]--><span style="font-size:10.0pt;font-family:Wingdings;color:#222426"><span style="mso-list:Ignore">è<span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: '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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