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<div class="moz-cite-prefix">On 27.01.2016 10:36, <a class="moz-txt-link-abbreviated" href="mailto:jeevan.patnaik@wipro.com">
jeevan.patnaik@wipro.com</a> wrote:<br>
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<div class="WordSection1"><span style="font-size:12.0pt;color:black">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 class="MsoListParagraph"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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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>
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<p class="MsoListParagraph"><span style="font-size:12.0pt;color:black">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></p>
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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>
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<p class="MsoListParagraph"><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoListParagraph"><span style="font-size:12.0pt;color:black">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.<o:p></o:p></span></p>
<p class="MsoListParagraph"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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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>
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