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<div>By patchless, I mean that neither Lustre nor ZFS need to patch the Linux kernel in order to work. With ldiskfs, some patching of the kernel needs to happen, which is where you’re running into trouble.</div>
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<div>I’m not going to say that it will be pain-free, just that you’ll remove a potentially large pain point in your dev process.</div>
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<div>-Ben Evans</div>
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<span style="font-weight:bold">From: </span>"Smith, Stan" <<a href="mailto:stan.smith@intel.com">stan.smith@intel.com</a>><br>
<span style="font-weight:bold">Date: </span>Monday, November 2, 2015 at 3:46 PM<br>
<span style="font-weight:bold">To: </span>Ben Evans <<a href="mailto:bevans@cray.com">bevans@cray.com</a>>, Patrick Farrell <<a href="mailto:paf@cray.com">paf@cray.com</a>>, "<a href="mailto:lustre-devel@lists.lustre.org">lustre-devel@lists.lustre.org</a>"
<<a href="mailto:lustre-devel@lists.lustre.org">lustre-devel@lists.lustre.org</a>><br>
<span style="font-weight:bold">Subject: </span>RE: [lustre-devel] porting Lustre server to RHEL6.7 distro running a kernel.org linux-3.12.39<br>
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<p class="MsoNormal"><b>From:</b> lustre-devel [<a href="mailto:lustre-devel-bounces@lists.lustre.org">mailto:lustre-devel-bounces@lists.lustre.org</a>]
<b>On Behalf Of </b>Ben Evans<br>
<b>Sent:</b> Monday, November 2, 2015 11:26 AM<br>
<b>To:</b> Patrick Farrell <<a href="mailto:paf@cray.com">paf@cray.com</a>>; <a href="mailto:lustre-devel@lists.lustre.org">
lustre-devel@lists.lustre.org</a><br>
<b>Subject:</b> Re: [lustre-devel] porting Lustre server to RHEL6.7 distro running a kernel.org linux-3.12.39<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black">Using ZFS as a backing filesystem may be a simpler way to go here if you want to stay with kernel.org. The lustre server + ZFS is patchless, and if you’re writing a new LND, you probably don’t
care about the backing filesystem anyway.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D">You are 100% spot-on, at this juncture in the LND development, I don’t really care so much about the backing filesystem; whatever builds/works such that I can continue LND testing in the client/server environment.
I suspect a large step between LNet selftests and full-on LFS.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">It’s Monday after a time zone change, hence a small clarification on your statement ‘</span><span style="font-size:10.5pt;color:black">The lustre server + ZFS is patchless</span><span style="color:#1F497D">‘.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">By patchless you saying the lustre source kernel patches are not required when using ZFS? Just to be crystal-clear.
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D">Stan.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black">-Ben Evans<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-devel <<a href="mailto:lustre-devel-bounces@lists.lustre.org">lustre-devel-bounces@lists.lustre.org</a>> on behalf of Patrick Farrell <<a href="mailto:paf@cray.com">paf@cray.com</a>><br>
<b>Date: </b>Monday, November 2, 2015 at 3:13 PM<br>
<b>To: </b>"<a href="mailto:lustre-devel@lists.lustre.org">lustre-devel@lists.lustre.org</a>" <<a href="mailto:lustre-devel@lists.lustre.org">lustre-devel@lists.lustre.org</a>><br>
<b>Subject: </b>Re: [lustre-devel] porting Lustre server to RHEL6.7 distro running a kernel.org linux-3.12.39<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black">Stan,<br>
<br>
Why not work with the CentOS 7 kernel on the server anyway? Is something your LND needs not available? CentOS 7 is freely available and isn't far off in terms of kernel version from 3.12.<br>
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You may be hard pressed to get useful advice on changing the ldiskfs patch series, that has the potential to be a pretty big job.<br>
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Regards,<br>
- Patrick Farrell<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black">On 11/02/2015 01:05 PM, Smith, Stan wrote:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Hello,</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> I’m currently unable to search the lustre-devel archives + 1<sup>st</sup> post to this list.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Having read lustre documentation I find only references to building lustre server for stock ‘distro’ kernels.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Does someone have suggestions on how to patch ldiskfs for a kernel.org kernel…..specifically weeding out RHEL/SLES/* distro FS enhancements from a kernel.org base?</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">I have written a Reliable Datagram LND which passes the LNet selftests (client lustre build) now entering the world of lustre server building.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Patching the kernel.org kernel for lustre server was fairly straightforward, creating the patch series for ldiskfs is another story.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Thanks,</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Stan.</span><span style="color:black"><o:p></o:p></span></p>
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<o:p></o:p></span></p>
<pre><span style="color:black">_______________________________________________<o:p></o:p></span></pre>
<pre><span style="color:black">lustre-devel mailing list<o:p></o:p></span></pre>
<pre><span style="color:black"><a href="mailto:lustre-devel@lists.lustre.org">lustre-devel@lists.lustre.org</a><a href="http://lists.lustre.org/listinfo.cgi/lustre-devel-lustre.org">http://lists.lustre.org/listinfo.cgi/lustre-devel-lustre.org</a><o:p></o:p></span></pre>
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