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<div class="moz-cite-prefix">Il 11/07/19 23:31, Timo Sirainen ha
scritto:<br>
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cite="mid:1C1E5910-EF2A-47CC-A38F-D9B5AC76398E@sirainen.com">
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On 11 Jul 2019, at 10.13, Alessio Cecchi via dovecot <<a
href="mailto:dovecot@dovecot.org" class=""
moz-do-not-send="true">dovecot@dovecot.org</a>> wrote:<br
class="">
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<p class="">Hi,</p>
<p class="">I'm running some Dovecot servers configured
with LVS + Director + Backend + NFS and version 2.2.36.3
(a7d78f5a2).<br class="">
</p>
<p class="">In the last days I see an increased number of
these error:</p>
<p class="">Error:
o_stream_send_istream(/nfs/mail/<a
href="http://company.com/info/Maildir/.Sent/tmp/1562771349.M255624P9151.pop01"
class="" moz-do-not-send="true">company.com/info/Maildir/.Sent/tmp/1562771349.M255624P9151.pop01</a>)
failed: Broken pipe</p>
<p class="">always with action "Disconnected in APPEND",
when users try to upload a message in Sent or Drafts.</p>
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<div>I think it simply means that Dovecot sees that the client
disconnected while it was APPENDing the mail. Although I don't
know why they would suddenly start now. And I especially don't
understand why the error is "Broken pipe". Dovecot uses it
internally when it closes input streams, so it's possibly
that, but why would isn't that happening elsewhere then.. Did
you upgrade your kernel recently? I guess it's also possible
that there is some bug in Dovecot, but I don't remember any
changes related to this for a long time.</div>
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<div>I guess it could actually be writing as well, because
"Broken pipe" is set also for closed output streams, so maybe
some failed NFS write could cause it (although it really
should have logged a different error in that case, so if that
was the reason this is a bug).</div>
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<div>Dovecot v2.3.x would log a different error depending on if
the problem was reading or writing, which would make this
clearer.</div>
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<p>Thanks Timo,</p>
<p>the operating system is CentOS 6 from years, and we doing regular
update every time available. And also the NFS storage is the same
from years.</p>
<p>The error is not starting to show now, I see it occasionally
since 2017 but after the last network upgrade (Firewall and
Switch) are coming more frequently. And only for Thunderbird and
sometimes Apple iOS Mail.</p>
<p>The error never occurred on old servers when we didn't have a
physical firewall, but we used iptables on individual servers, and
MTU on network interfaces ha MTU 9000, but many others components
was updated in the meantime.</p>
<p>We will upgrade to Dovecot 2.3 in the next months.<br>
</p>
<pre class="moz-signature" cols="72">--
Alessio Cecchi
Postmaster @ <a class="moz-txt-link-freetext" href="http://www.qboxmail.it">http://www.qboxmail.it</a>
<a class="moz-txt-link-freetext" href="https://www.linkedin.com/in/alessice">https://www.linkedin.com/in/alessice</a></pre>
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