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Pascal,
<div>Thanks for taking the time to update the wiki, every contribution helps. </div>
<div><br>
</div>
<div>Note that the need for patches kernels for project quotas will also go</div>
<div>away with newer kernels, but Red Hat just couldn't make that feature work</div>
<div>with the RHEL7 kernel without breaking the ABI. <br>
<br>
<div dir="ltr">Cheers, Andreas</div>
<div dir="ltr"><br>
<blockquote type="cite">On Jun 2, 2020, at 06:51, Pascal Suter <pascal.suter@dalco.ch> wrote:<br>
<br>
</blockquote>
</div>
<blockquote type="cite">
<div dir="ltr">
<p>Hi George <br>
</p>
<p>that used to be the case until before 2.10.1, but since 2.10.1 even ldiskfs does not require a patch anymore. I have actually updated from a patched 2.10.3 to 2.12.4 patchless and i am using ldiskfs for my MDTs and ZFS for the OSTs</p>
<p>but i think i just found out why there are still both versions being packed.. while i was looking for a link to quote regarding ldiskfs now working without a patch, i actually found the announcement of 2.10.1 at
<a class="moz-txt-link-freetext" href="http://lustre.org/lustre-2-10-1-released/">
http://lustre.org/lustre-2-10-1-released/</a> which states <br>
</p>
<p> "Patchless server build for ldiskfs is now routinely provided. Note that the patched kernel version must still be used to make use of project quotas"</p>
<p>And here is the document that my question was based upon: <br>
</p>
<p><a class="moz-txt-link-freetext" href="http://wiki.lustre.org/Installing_the_Lustre_Software">http://wiki.lustre.org/Installing_the_Lustre_Software</a></p>
<p>it states: <br>
</p>
<p>"Note: With the release of Lustre version 2.10.1, it is possible to use patchless kernels for Lustre servers running LDISKFS. The patchless LDISKFS server distribution does not include a Linux kernel. Instead, patchless servers will use the kernel distributed
with the operating system." <br>
</p>
<p>and here is a LUDOC issue regarding documenting this in the official lustre documentation:
<br>
</p>
<p><a class="moz-txt-link-freetext" href="https://jira.whamcloud.com/browse/LUDOC-435">https://jira.whamcloud.com/browse/LUDOC-435</a></p>
<p>(amazing what you can find once you know what to look for ;)) <br>
</p>
<p>i have applied for a lustre.org wiki account to add this missing piece of information which should help people to choose better if they want to use the patched or patchless kernel. luckily i'm not using the project quota feature ;)
<br>
</p>
<p>cheers</p>
<p>Pascal <br>
</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 6/2/20 1:50 PM, George Melikov wrote:<br>
</div>
<blockquote type="cite" cite="mid:73541591098503@mail.yandex.ru">
<div>IIRC "patchless server" can only serve ZFS based backends.<br>
So, it you really need ldiskfs - you're stuck with patched kernel for now.</div>
<div> </div>
<div>27.05.2020, 18:41, "Pascal Suter" <a class="moz-txt-link-rfc2396E" href="mailto:pascal.suter@dalco.ch">
<pascal.suter@dalco.ch></a>:</div>
<blockquote>
<p>Hi all<br>
<br>
i am currently upgrading a lustre 2.10.3 to 2.12.4 on CentOS 7.7 and I<br>
am unsure if I should use the patchless or patched server version. what<br>
is the advantage of still using the patched server version over using<br>
the patchless variant? From an linux sysadmin point of view I prefer to<br>
use an unpatched kernel and it would seem unnecessary to still maintain<br>
a patched variant if they both worked the same in the end.<br>
<br>
regards<br>
<br>
Pascal<br>
<br>
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</blockquote>
<div> </div>
<div> </div>
<div style="color:#000000;font:12px
'noteworthy-light';text-transform:none;white-space:normal">
<span style="font-family:'noteworthy-light'">____________________________________</span><br>
Sincerely,<br>
George Melikov</div>
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