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    <div class="moz-cite-prefix">On 02/08/2016 09:57 PM, Simon
      Turcotte-Langevin wrote:<br>
    </div>
    <blockquote
      cite="mid:7d6bd9c471a8416682ae9afc17d53c74@MSR-MAIL-EXCH01.ubisoft.org"
      type="cite">
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      <div class="WordSection1">
        <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Good
            day to you Pranith,<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Once
            again, thank you for your time. Our use case does include a
            lot of small files and the read performances must not be
            impacted by a RELATIME-based solution. Even though this
            option could fix the RELATIME behavior on GlusterFS, it
            looks like the impact of the performance could be too great
            for us. Therefore, we will test the solution, but we will
            also consider alternative ways to detect usage of the files
            we serve.</span></p>
      </div>
    </blockquote>
    hi Simon,<br>
            Yeah it is a trade off :-/. What is the kind of workload you
    guys use? It would be nice to know what you guys(ubisoft) do in
    detail, even if it is a blog or something where you guys explain it
    in detail it would be fine. I remember you guys from gluster 3.4
    days (vaguely remember debugging root:root directory permission
    issues). What version are you guys using nowadays? How has been the
    experience? What are your pain points with gluster? This feedback
    helps in improving gluster. <br>
    <br>
    Thanks<br>
    Pranith<br>
    <br>
    <blockquote
      cite="mid:7d6bd9c471a8416682ae9afc17d53c74@MSR-MAIL-EXCH01.ubisoft.org"
      type="cite">
      <div class="WordSection1">
        <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Simon<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
        <div>
          <div style="border:none;border-top:solid #E1E1E1
            1.0pt;padding:3.0pt 0cm 0cm 0cm">
            <p class="MsoNormal"><b><span
                  style="color:windowtext;mso-fareast-language:FR-CA"
                  lang="EN-US">From:</span></b><span
                style="color:windowtext;mso-fareast-language:FR-CA"
                lang="EN-US"> Pranith Kumar Karampuri
                [<a class="moz-txt-link-freetext" href="mailto:pkarampu@redhat.com">mailto:pkarampu@redhat.com</a>]
                <br>
                <b>Sent:</b> 8 février 2016 00:26<br>
                <b>To:</b> Simon Turcotte-Langevin
                <a class="moz-txt-link-rfc2396E" href="mailto:simon.turcotte-langevin@ubisoft.com">&lt;simon.turcotte-langevin@ubisoft.com&gt;</a>;
                <a class="moz-txt-link-abbreviated" href="mailto:gluster-users@gluster.org">gluster-users@gluster.org</a><br>
                <b>Cc:</b> UPS_Development
                <a class="moz-txt-link-rfc2396E" href="mailto:UPS_Development@ubisoft.com">&lt;UPS_Development@ubisoft.com&gt;</a><br>
                <b>Subject:</b> Re: [Gluster-users] GlusterFS behaviour
                on stat syscall with relatime activated<o:p></o:p></span></p>
          </div>
        </div>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal" style="margin-bottom:12.0pt"><span
            style="font-size:12.0pt;mso-fareast-language:FR-CA"><o:p> </o:p></span></p>
        <div>
          <p class="MsoNormal">On 02/06/2016 12:19 AM, Simon
            Turcotte-Langevin wrote:<o:p></o:p></p>
        </div>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Good
              day to you Pranith,</span><o:p></o:p></p>
          <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Thank
              you for your answer, it was exactly this. However, we
              still have an issue with RELATIME on GlusterFS.</span><o:p></o:p></p>
          <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Stating
              the file does not modify atime anymore, with quick-read
              disabled, however cat-ing the file does not replicate the
              atime.</span><o:p></o:p></p>
        </blockquote>
        <p class="MsoNormal"><span
            style="font-size:12.0pt;font-family:&quot;Times New
            Roman&quot;,serif;mso-fareast-language:FR-CA">This is
            because of open-behind feature. Disable open-behind with:
            "gluster volume set &lt;volname&gt; open-behind off". I
            believe you will see the atime behavior you want to see with
            it. This will reduce the performance of small file reads
            (&lt; 64KB). Instead of one lookup over the network now it
            will do, lookup + open(This will be sent to both the replica
            bricks which updates atime) + read (Only one of the bricks).
            Let me know if you want any more information.<br>
            <br>
            Pranith<br>
            <br>
            <br>
            <o:p></o:p></span></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">If
              I touch manually the file, the atime (or utimes) is
              replicated correctly.</span><o:p></o:p></p>
          <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">So
              to sum it up:</span><o:p></o:p></p>
          <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoListParagraph"
            style="text-indent:-18.0pt;mso-list:l1 level1 lfo2"><!--[if !supportLists]--><span
              style="font-family:Symbol"><span style="mso-list:Ignore">·<span
                  style="font:7.0pt &quot;Times New Roman&quot;">        
                </span></span></span><!--[endif]--><span
              style="color:#1F497D" lang="EN-US">[node1] Touch –a file1
            </span><o:p></o:p></p>
          <p class="MsoListParagraph"
            style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l1
            level2 lfo2">
            <!--[if !supportLists]--><span
              style="font-family:&quot;Courier New&quot;"><span
                style="mso-list:Ignore">o<span style="font:7.0pt
                  &quot;Times New Roman&quot;">  
                </span></span></span><!--[endif]--><span
              style="font-family:Wingdings;color:#1F497D" lang="EN-US">à</span><span
              style="color:#1F497D" lang="EN-US"> Access time is right
              on [node1] [node2] and [node3]</span><o:p></o:p></p>
          <p class="MsoListParagraph"
            style="text-indent:-18.0pt;mso-list:l1 level1 lfo2"><!--[if !supportLists]--><span
              style="font-family:Symbol"><span style="mso-list:Ignore">·<span
                  style="font:7.0pt &quot;Times New Roman&quot;">        
                </span></span></span><!--[endif]--><span
              style="color:#1F497D" lang="EN-US">[node1] Cat file1
            </span><o:p></o:p></p>
          <p class="MsoListParagraph"
            style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l1
            level2 lfo2">
            <!--[if !supportLists]--><span
              style="font-family:&quot;Courier New&quot;"><span
                style="mso-list:Ignore">o<span style="font:7.0pt
                  &quot;Times New Roman&quot;">  
                </span></span></span><!--[endif]--><span
              style="font-family:Wingdings;color:#1F497D" lang="EN-US">à</span><span
              style="color:#1F497D" lang="EN-US"> Access time is right
              on [node1]</span><o:p></o:p></p>
          <p class="MsoListParagraph"
            style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l1
            level2 lfo2">
            <!--[if !supportLists]--><span
              style="font-family:&quot;Courier New&quot;"><span
                style="mso-list:Ignore">o<span style="font:7.0pt
                  &quot;Times New Roman&quot;">  
                </span></span></span><!--[endif]--><span
              style="font-family:Wingdings;color:#1F497D" lang="EN-US">à</span><span
              style="color:#1F497D" lang="EN-US"> Access time is wrong
              on [node2] and [node3]</span><o:p></o:p></p>
          <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Would
              you have any idea what is going on behind the curtain, and
              if there is any way to fix that behavior?</span><o:p></o:p></p>
          <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Thank
              you,</span><o:p></o:p></p>
          <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Simon</span><o:p></o:p></p>
          <p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"> </span><o:p></o:p></p>
          <div>
            <div style="border:none;border-top:solid #E1E1E1
              1.0pt;padding:3.0pt 0cm 0cm 0cm">
              <p class="MsoNormal"><b><span
                    style="color:windowtext;mso-fareast-language:FR-CA"
                    lang="EN-US">From:</span></b><span
                  style="color:windowtext;mso-fareast-language:FR-CA"
                  lang="EN-US"> Pranith Kumar Karampuri [<a
                    moz-do-not-send="true"
                    href="mailto:pkarampu@redhat.com">mailto:pkarampu@redhat.com</a>]
                  <br>
                  <b>Sent:</b> 5 février 2016 00:55<br>
                  <b>To:</b> Simon Turcotte-Langevin <a
                    moz-do-not-send="true"
                    href="mailto:simon.turcotte-langevin@ubisoft.com">
                    &lt;simon.turcotte-langevin@ubisoft.com&gt;</a>; <a
                    moz-do-not-send="true"
                    href="mailto:gluster-users@gluster.org">
                    gluster-users@gluster.org</a><br>
                  <b>Cc:</b> UPS_Development <a moz-do-not-send="true"
                    href="mailto:UPS_Development@ubisoft.com">&lt;UPS_Development@ubisoft.com&gt;</a><br>
                  <b>Subject:</b> Re: [Gluster-users] GlusterFS
                  behaviour on stat syscall with relatime activated</span><o:p></o:p></p>
            </div>
          </div>
          <p class="MsoNormal"> <o:p></o:p></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
              style="font-size:12.0pt;mso-fareast-language:FR-CA"> </span><o:p></o:p></p>
          <div>
            <p class="MsoNormal">On 02/03/2016 10:12 PM, Simon
              Turcotte-Langevin wrote:<o:p></o:p></p>
          </div>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <p class="MsoNormal"><span lang="EN-US">Hi, we have multiple
                clusters of GlusterFS which are mostly alike. The
                typical setup is as such:</span><o:p></o:p></p>
            <p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="text-indent:-18.0pt;mso-list:l0 level1 lfo4"><!--[if !supportLists]--><span
                style="mso-list:Ignore">-<span style="font:7.0pt
                  &quot;Times New Roman&quot;">         
                </span></span><!--[endif]--><span lang="EN-US">Cluster
                of 3 nodes</span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="text-indent:-18.0pt;mso-list:l0 level1 lfo4"><!--[if !supportLists]--><span
                style="mso-list:Ignore">-<span style="font:7.0pt
                  &quot;Times New Roman&quot;">         
                </span></span><!--[endif]--><span lang="EN-US">Replication
                factor of 3</span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="text-indent:-18.0pt;mso-list:l0 level1 lfo4"><!--[if !supportLists]--><span
                style="mso-list:Ignore">-<span style="font:7.0pt
                  &quot;Times New Roman&quot;">         
                </span></span><!--[endif]--><span lang="EN-US">Each node
                has 1 brick, mounted on XFS with RELATIME and NODIRATIME</span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="text-indent:-18.0pt;mso-list:l0 level1 lfo4"><!--[if !supportLists]--><span
                style="mso-list:Ignore">-<span style="font:7.0pt
                  &quot;Times New Roman&quot;">         
                </span></span><!--[endif]--><span lang="EN-US">Each node
                has 8 disks in RAID 0 hardware</span><o:p></o:p></p>
            <p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
            <p class="MsoNormal"><span lang="EN-US">The main problem we
                are facing is that observation of the access time of a
                file on the volume will update the access time.</span><o:p></o:p></p>
            <p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
            <p class="MsoNormal"><span lang="EN-US">The steps to
                reproduce the problem are:</span><o:p></o:p></p>
            <p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="text-indent:-18.0pt;mso-list:l2 level1 lfo6"><!--[if !supportLists]--><span
                style="mso-list:Ignore">-<span style="font:7.0pt
                  &quot;Times New Roman&quot;">         
                </span></span><!--[endif]--><span lang="EN-US">Create a
                file (echo ‘some data’ &gt; /mnt/gv0/file)</span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="text-indent:-18.0pt;mso-list:l2 level1 lfo6"><!--[if !supportLists]--><span
                style="mso-list:Ignore">-<span style="font:7.0pt
                  &quot;Times New Roman&quot;">         
                </span></span><!--[endif]--><span lang="EN-US">Touch its
                mtime and atime to some past date (touch –d 19700101
                /mnt/gv0/file)</span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="text-indent:-18.0pt;mso-list:l2 level1 lfo6"><!--[if !supportLists]--><span
                style="mso-list:Ignore">-<span style="font:7.0pt
                  &quot;Times New Roman&quot;">         
                </span></span><!--[endif]--><span lang="EN-US">Touch its
                mtime to the current timestamp (touch –m /mnt/gv0/file)</span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="text-indent:-18.0pt;mso-list:l2 level1 lfo6"><!--[if !supportLists]--><span
                style="mso-list:Ignore">-<span style="font:7.0pt
                  &quot;Times New Roman&quot;">         
                </span></span><!--[endif]--><span lang="EN-US">Stat the
                file until atime is updated (stat /mnt/gv0/file)</span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2
              level2 lfo6">
              <!--[if !supportLists]--><span
                style="font-family:&quot;Courier New&quot;"><span
                  style="mso-list:Ignore">o<span style="font:7.0pt
                    &quot;Times New Roman&quot;">  
                  </span></span></span><!--[endif]--><span lang="EN-US">Sometimes
                it’s instant, sometimes it requires to execute the above
                command a couple of time</span><o:p></o:p></p>
          </blockquote>
          <p class="MsoNormal"><span style="font-size:12.0pt">atime
              changes on open call.<br>
              <br>
              Quick-read xlator opens the file and reads the content on
              'lookup' which gets triggered in stat. It does that to
              serve reads from memory to reduce number of network round
              trips for small files. Could you disable that xlator and
              try the experiment? On my machine the time didn't change
              after I disabled that feature using:<br>
              <br>
              "gluster volume set &lt;volname&gt; quick-read off"<br>
              <br>
              Pranith<br>
              <br>
              <br>
            </span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <p class="MsoListParagraph"><span lang="EN-US"> </span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0cm"><span
                lang="EN-US">On the IRC channel, I spoke to a developer
                (nickname ndevos) who said that it might be a getxattr()
                syscall that could be called when stat() is called on a
                replicated volume.</span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0cm"><span
                lang="EN-US"> </span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0cm"><span
                lang="EN-US">Anybody can reproduce this issue? Is it a
                bug, or is it working as intended? Is there any
                workaround?</span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0cm"><span
                lang="EN-US"> </span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0cm"><span
                lang="EN-US">Thank you,</span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0cm"><span
                lang="EN-US">Simon</span><o:p></o:p></p>
            <p class="MsoNormal"><span style="font-size:12.0pt"><br>
                <br>
                <br>
                <br>
              </span><o:p></o:p></p>
            <pre>_______________________________________________<o:p></o:p></pre>
            <pre>Gluster-users mailing list<o:p></o:p></pre>
            <pre><a moz-do-not-send="true" href="mailto:Gluster-users@gluster.org">Gluster-users@gluster.org</a><o:p></o:p></pre>
            <pre><a moz-do-not-send="true" href="http://www.gluster.org/mailman/listinfo/gluster-users">http://www.gluster.org/mailman/listinfo/gluster-users</a><o:p></o:p></pre>
          </blockquote>
          <p class="MsoNormal"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
        </blockquote>
        <p class="MsoNormal"><span
            style="font-size:12.0pt;font-family:&quot;Times New
            Roman&quot;,serif;mso-fareast-language:FR-CA"><o:p> </o:p></span></p>
      </div>
    </blockquote>
    <br>
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