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<p class="MsoNormal"><span style="color:black">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">Now, it cleared my confusion. So, we really should go for having storage as separate, we will fix with this option.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">And besides, I have completely ignored ZFS till now. Can I go for ZFS instead of ldiskfs? What’s the main difference I can find?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><i><span style="color:#2E74B5">--<o:p></o:p></span></i></p>
<p class="MsoNormal"><span style="color:#2E74B5">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#2E74B5">Jeevan.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="color:windowtext">From:</span></b><span style="color:windowtext"> lustre-discuss [mailto:lustre-discuss-bounces@lists.lustre.org]
<b>On Behalf Of </b>Oliver Mangold<br>
<b>Sent:</b> Wednesday, January 27, 2016 3:25 PM<br>
<b>To:</b> lustre-discuss@lists.lustre.org<br>
<b>Subject:</b> Re: [lustre-discuss] How to configure OST and OSS on separate nodes<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On 27.01.2016 10:36, <a href="mailto:jeevan.patnaik@wipro.com">
jeevan.patnaik@wipro.com</a> wrote:<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif">But my question is: Can I use OST on client and OSS on separate server (if it is possible to run OST and OSS on separate servers)
<o:p></o:p></span></p>
<p class="MsoListParagraph"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif">I don't understand what you mean. OSS is just a name for the machine which runs one or multiple OSTs. So by definition OSTs always run on OSSes.<br>
<br>
<o:p></o:p></span></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoListParagraph"><span style="font-size:12.0pt">The reason for this is we have tens of servers with internal hard disk of 4T each which we want to use it for OSTs, but all these servers are also should be clients (they are the grid execution hosts).</span><o:p></o:p></p>
</blockquote>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif">Sounds like a bad idea to me to do that. Beside the mentioned memory pressure problems, you also don't have a failover configuration for the OSTs, which is strongly recommended.
Otherwise one downed server will stall all or most of your active jobs.<br>
<br>
<o:p></o:p></span></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoListParagraph"><span style="font-size:12.0pt">So, I am thinking of having separate OSSs and use the servers itself as OSTs. Also, do we need to install lustre kernel in all those OSTs? Because, all these servers are running with kernel 2.6.32-573.12.1.el6.x86_64,
which the standard lustre packages won’t be supporting. So, we need to roll back to 32-504_lustre kernel and again we need to work on setting yum repos, installing packages, resolving dependencies required for our tools..it’s really a lot of work.</span><o:p></o:p></p>
<p class="MsoListParagraph"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif">The last I know is, you need a patched kernel when using ldiskfs as the backing filesystem, but you can use a patchless kernel with ZFS.<br>
<br>
<o:p></o:p></span></p>
<pre><o:p> </o:p></pre>
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