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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Thanks Ben and Malcolm,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Yes, now I have an idea what to do. I thought multiport DAS that could share a single storage on two servers is hard to find. Also, if there is any cost concern, we can still use one directly attached
Primary node and Network attached Failover node.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><i><span lang="EN-US" style="color:#2E74B5">--<o:p></o:p></span></i></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#2E74B5">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#2E74B5">Jeevan.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Cowe, Malcolm J [mailto:malcolm.j.cowe@intel.com]
<br>
<b>Sent:</b> 15 March 2016 01:58<br>
<b>To:</b> Jeevan Behara Patnaik (GIS) <jeevan.patnaik@wipro.com>; lustre-discuss@lists.lustre.org<br>
<b>Subject:</b> RE: [lustre-discuss] Lustre failover configuration - Need help in selecting storage<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-GB">Why not use a multi-ported direct attached storage (DAS) enclosure? Performance is retained and configuration is straightforward. There are a number of such enclosures available from a range of vendors, many of whom have
solutions that have been qualified with Lustre.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#0071C5">Malcolm Cowe<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Arial",sans-serif">High Performance Data Division<o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:8.0pt;font-family:"Arial",sans-serif">Intel Corporation</span></b><span lang="EN-US" style="font-size:8.0pt;font-family:"Arial",sans-serif"> |
<span style="color:#0071C5"><a href="http://www.intel.com">www.intel.com</a></span><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#2E74B5"><o:p> </o:p></span></p>
</div>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Ben Evans [mailto:bevans@cray.com]
<br>
<b>Sent:</b> 14 March 2016 19:15<br>
<b>To:</b> Jeevan Behara Patnaik (GIS) <jeevan.patnaik@wipro.com>; lustre-discuss@lists.lustre.org<br>
<b>Subject:</b> Re: [lustre-discuss] Lustre failover configuration - Need help in selecting storage<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><span style="font-size:10.5pt;color:black">You'll only go as fast as your slowest piece.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black"><o:p> </o:p></span></p>
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<div>
<p class="MsoNormal"><span style="font-size:10.5pt;color:black">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.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.5pt;color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.5pt;color:black">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.<o:p></o:p></span></p>
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<div>
<p class="MsoNormal"><span style="font-size:10.5pt;color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.5pt;color:black">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.<o:p></o:p></span></p>
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<div>
<p class="MsoNormal"><span style="font-size:10.5pt;color:black"><o:p> </o:p></span></p>
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<div>
<p class="MsoNormal"><span style="font-size:10.5pt;color:black">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).<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black"><o:p> </o:p></span></p>
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<div>
<p class="MsoNormal"><span style="font-size:10.5pt;color:black">-Ben Evans<o:p></o:p></span></p>
</div>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="color:black">From: </span></b><span style="color:black">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>
<b>Date: </b>Monday, March 14, 2016 at 8:36 AM<br>
<b>To: </b>"<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>
<b>Subject: </b>[lustre-discuss] Lustre failover configuration - Need help in selecting storage<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.5pt;color:black"><o:p> </o:p></span></p>
</div>
<div>
<div>
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="background:white;border-collapse:collapse">
<tbody>
<tr>
<td width="16" valign="top" style="width:12.25pt;padding:0cm 11.25pt 0cm 0cm"></td>
<td width="1621" valign="top" style="width:1215.5pt;padding:0cm 0cm 0cm 0cm">
<p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:0cm">
<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.</span><o:p></o:p></p>
<p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:0cm">
<span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#222426">With very limited knowledge on hardware, I have the below understanding:</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:6.0pt;margin-left:22.5pt;text-indent:-18.0pt;mso-list:l1 level1 lfo2">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol"><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.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:6.0pt;margin-left:22.5pt;text-indent:-18.0pt;mso-list:l1 level1 lfo2">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol"><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.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:6.0pt;margin-left:22.5pt;text-indent:-18.0pt;mso-list:l1 level1 lfo2">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol"><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).</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:22.5pt;text-indent:-18.0pt;mso-list:l1 level1 lfo2">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol"><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.</span><o:p></o:p></p>
<p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:0cm">
<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.</span><o:p></o:p></p>
<p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:0cm">
<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:0cm"><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.”</span></span><o:p></o:p></p>
<p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:0cm">
<span class="comment-copy"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222426;border:none windowtext 1.0pt;padding:0cm">So, is it true that we don’t need to worry about bandwidth of the storage server?</span></span><o:p></o:p></p>
<p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:0cm">
<span class="comment-copy"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222426;border:none windowtext 1.0pt;padding:0cm">I mean, for example: the communication as I understood is as follows:</span></span><o:p></o:p></p>
<p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo4">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Wingdings"><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:0cm">Client
</span></span><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;border:none windowtext 1.0pt;padding:0cm">ßà</span></span><span class="comment-copy"><span style="font-size:10.0pt;border:none windowtext 1.0pt;padding:0cm"> MGS (Ethernet)</span></span><o:p></o:p></p>
<p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo4">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Wingdings"><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:0cm">MGS
</span></span><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;border:none windowtext 1.0pt;padding:0cm">ßà</span></span><span class="comment-copy"><span style="font-size:10.0pt;border:none windowtext 1.0pt;padding:0cm"> MGT (Direct/ISCSI)
</span></span><o:p></o:p></p>
<p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo4">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Wingdings"><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:0cm">MGS
</span></span><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;border:none windowtext 1.0pt;padding:0cm">ßà</span></span><span class="comment-copy"><span style="font-size:10.0pt;border:none windowtext 1.0pt;padding:0cm"> MDS (Ethernet/Internal
Communication)</span></span><o:p></o:p></p>
<p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo4">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Wingdings"><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:0cm">MDS
</span></span><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;border:none windowtext 1.0pt;padding:0cm">ßà</span></span><span class="comment-copy"><span style="font-size:10.0pt;border:none windowtext 1.0pt;padding:0cm"> MDT (Direct/ISCSI/Ethernet)</span></span><o:p></o:p></p>
<p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo4">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Wingdings"><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:0cm">MDS
</span></span><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;border:none windowtext 1.0pt;padding:0cm">ßà</span></span><span class="comment-copy"><span style="font-size:10.0pt;border:none windowtext 1.0pt;padding:0cm"> OSS (Ethernet)</span></span><o:p></o:p></p>
<p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo4">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Wingdings"><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:0cm">OSS
</span></span><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;border:none windowtext 1.0pt;padding:0cm">ßà</span></span><span class="comment-copy"><span style="font-size:10.0pt;border:none windowtext 1.0pt;padding:0cm"> OST (Direct/ISCSI/Ethernet)
</span></span><o:p></o:p></p>
<p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo4">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Wingdings"><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:0cm">OST
</span></span><span class="comment-copy"><span style="font-size:10.0pt;font-family:Wingdings;border:none windowtext 1.0pt;padding:0cm">ßà</span></span><span class="comment-copy"><span style="font-size:10.0pt;border:none windowtext 1.0pt;padding:0cm"> Client
(Ethernet) </span></span><o:p></o:p></p>
<p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:0cm">
<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?
</span><o:p></o:p></p>
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<td width="1621" valign="top" style="width:1215.5pt;padding:0cm 0cm 0cm 0cm">
<p style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:0cm">
<span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#222426"> </span><o:p></o:p></p>
</td>
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<p class="MsoNormal"><b><span lang="EN-US" style="color:#C45911">Jeevan Patnaik B</span></b><span lang="EN-US" style="color:#2E74B5">|
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