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<div class="moz-cite-prefix">On 07/03/2014 07:35 AM, Pranith Kumar
Karampuri wrote:<br>
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<div class="moz-cite-prefix">On 07/01/2014 12:58 PM, COCHE
Sébastien wrote:<br>
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<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Does
it mean that if I use gluster FUSE driver or NFS client,
fcntl locks are manages and no data corruption could
happen ?</span></p>
</div>
</blockquote>
Yes.<br>
</blockquote>
To be more precise, Yes, if applications take appropriate locks.<br>
<br>
Pranith<br>
<blockquote cite="mid:53B4BA60.4040701@redhat.com" type="cite"> <br>
Pranith<br>
<blockquote
cite="mid:1F5F942CDD72D840988906E4FE5B9BC27E1CE8@INFWPMES02.joinmyit.dom"
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>
<div>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D;mso-fareast-language:FR;layout-grid-mode:line">Sébastien
Coché,</span></b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D;mso-fareast-language:FR;layout-grid-mode:line"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-top:6.0pt"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:FR">Architecte
Infrastructure</span><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D;mso-fareast-language:FR;layout-grid-mode:line">
(DIP)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D;mso-fareast-language:FR;layout-grid-mode:line">SIGMA
Informatique – </span><u><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue;mso-fareast-language:FR;layout-grid-mode:line"><a
moz-do-not-send="true" href="http://www.sigma.fr/">www.sigma.fr</a><o:p></o:p></span></u></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:FR">8
rue Newton – CS 84533 – 44245 LA CHAPELLE SUR ERDRE
CEDEX<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-line-height-alt:0pt"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D;mso-fareast-language:FR;layout-grid-mode:line">Tél :
</span><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:FR">(+33)
2.53.48.92.57</span><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D;mso-fareast-language:FR;layout-grid-mode:line">
– Mob : 06 22 25 03 74</span><span
style="font-size:9.0pt;font-family:"Arial","sans-serif";mso-fareast-language:FR"><o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:FR">De :</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:FR">
Pranith Kumar Karampuri [<a moz-do-not-send="true"
class="moz-txt-link-freetext"
href="mailto:pkarampu@redhat.com">mailto:pkarampu@redhat.com</a>]
<br>
<b>Envoyé :</b> lundi 30 juin 2014 18:08<br>
<b>À :</b> COCHE Sébastien<br>
<b>Cc :</b> <a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:gluster-users@gluster.org">gluster-users@gluster.org</a><br>
<b>Objet :</b> Re: [Gluster-users] Concurrent writes
management.<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">On 06/30/2014 09:26 PM, COCHE Sébastien
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">Thank you for your response.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"
lang="EN-US">I understand that the file exist only one
time on the volume. But it can be accessed in write, by
many nodes (clients) at the same time.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"
lang="EN-US">What’s happen in those case ?</span><o:p></o:p></p>
</blockquote>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";mso-fareast-language:FR">Nothing
bad will happen to the filesystem. But the file may not be
meaningful if the applications writing to it don't
synchronize overlapping concurrent writes with fcntl
locks.<br>
<br>
Pranith <br>
<br>
<o:p></o:p></span></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"> </span><o:p></o:p></p>
<div>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D;mso-fareast-language:FR;layout-grid-mode:line">Sébastien
Coché,</span></b><o:p></o:p></p>
<p class="MsoNormal" style="margin-top:6.0pt"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:FR">Architecte
Infrastructure</span><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D;mso-fareast-language:FR;layout-grid-mode:line">
(DIP)</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D;mso-fareast-language:FR;layout-grid-mode:line">SIGMA
Informatique – </span><u><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue;mso-fareast-language:FR;layout-grid-mode:line"><a
moz-do-not-send="true" href="http://www.sigma.fr/">www.sigma.fr</a></span></u><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:FR">8
rue Newton – CS 84533 – 44245 LA CHAPELLE SUR ERDRE
CEDEX</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-line-height-alt:0pt"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D;mso-fareast-language:FR;layout-grid-mode:line">Tél :
</span><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:FR">(+33)
2.53.48.92.57</span><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D;mso-fareast-language:FR;layout-grid-mode:line">
– Mob : 06 22 25 03 74</span><o:p></o:p></p>
</div>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:FR">De :</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:FR">
Pranith Kumar Karampuri [<a moz-do-not-send="true"
href="mailto:pkarampu@redhat.com">mailto:pkarampu@redhat.com</a>]
<br>
<b>Envoyé :</b> lundi 30 juin 2014 17:49<br>
<b>À :</b> COCHE Sébastien; <a moz-do-not-send="true"
href="mailto:gluster-users@gluster.org">gluster-users@gluster.org</a><br>
<b>Objet :</b> Re: [Gluster-users] Concurrent writes
management.</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<div>
<p class="MsoNormal">On 06/30/2014 07:49 PM, COCHE Sébastien
wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span lang="EN-US">Hello</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">I have a question
regarding concurrent write.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">How are manage those
writes ? Is there a risk of data corruption ?</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Is there a lock
mechanism, against corruption ? If yes, how it work ?</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">I already had a look
to forum and documents but I did not found a deep dive
explanation.</span><o:p></o:p></p>
</blockquote>
<p class="MsoNormal"><span style="font-size:12.0pt">For plain
distribute volumes there exists only one file in the
volume with the data. All the operations on the file
happen just like they happen on normal filesystem. For
replicated/distributed replicated volumes there are
internal locks taken by replication feature to avoid any
in-consistencies.<br>
Please check <a moz-do-not-send="true"
href="https://github.com/gluster/glusterfs/blob/master/doc/features/afr-v1.md">https://github.com/gluster/glusterfs/blob/master/doc/features/afr-v1.md</a>
to know more about it.<br>
<br>
Pranith<br>
<br>
<br>
</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">Thank for your
feedback</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Sorry for my poor
english ;-)</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal">Sebastien<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://supercolony.gluster.org/mailman/listinfo/gluster-users">http://supercolony.gluster.org/mailman/listinfo/gluster-users</a><o:p></o:p></pre>
<p class="MsoNormal"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";mso-fareast-language:FR"><o:p> </o:p></span></p>
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