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<p class="MsoNormal"><a name="_MailEndCompose"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hello Christof,<o:p></o:p></span></a></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thank you very much for the explanation. You have point us in the right direction.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">Vriendelijke groet,<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">Jaap Jan Ouwehand</span></b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black"><br>
ICT Specialist (Storage & Linux)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">VUmc - ICT<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><img width="160" height="62" id="_x0000_i1026" src="cid:image001.gif@01D33D19.085FA900" alt="VUmc_logo_samen_kiezen_voor_beter"><o:p></o:p></span></p>
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</span></b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Van:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> gpfsug-discuss-bounces@spectrumscale.org [mailto:gpfsug-discuss-bounces@spectrumscale.org]
<b>Namens </b>Christof Schmitt<br>
<b>Verzonden:</b> maandag 2 oktober 2017 19:13<br>
<b>Aan:</b> gpfsug-discuss@spectrumscale.org<br>
<b>CC:</b> gpfsug-discuss@spectrumscale.org<br>
<b>Onderwerp:</b> Re: [gpfsug-discuss] number of SMBD processes<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif"">Hello,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif"">the short answer is that the "deadtime" parameter is not a supported parameter in Spectrum Scale.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif"">The longer answer is that setting "deadtime" likely does not solve any issue. "deadtime" was introduced in Samba mainly for older protocol versions. While it is implemented
independent of protocol versions, not the statement about "no open files" for a connection to be closed. Spectrum Scale only supports SMB versions 2 and 3. Basically everything there is based on an open file handle. Most SMB 2/3 clients open at least the root
directory of the export and register for change notifications there and the client then can wait for any time for changes. That is a valid case, and the open directory handle prevents the connection from being affected by any setting of the "deadtime" parameter.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif"">Clients that are no longer active and have not properly closed the connection are detected on the TCP level:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif""># mmsmb config list | grep sock<br>
socket options TCP_NODELAY SO_KEEPALIVE TCP_KEEPCNT=4 TCP_KEEPIDLE=240 TCP_KEEPINTVL=15<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif"">Every client that no longer responds for 5 minutes will have the connection dropped (240s + 4x15s).<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif"">On the other hand, if the SMB clients are still responding to TCP keep-alive packets, then the connection is considered valid. It might be interesting to look into the unwanted
connections and possibly capture a network trace or look into the client systems to better understand the situation.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif"">Regards,<o:p></o:p></span></p>
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</span><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">Christof Schmitt || IBM || Spectrum Scale Development || Tucson, AZ<br>
<a href="mailto:christof.schmitt@us.ibm.com">christof.schmitt@us.ibm.com</a> || +1-520-799-2469 (T/L: 321-2469)</span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
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<blockquote style="border:none;border-left:solid #AAAAAA 1.5pt;padding:0cm 0cm 0cm 4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt">
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif"">----- Original message -----<br>
From: "Ouwehand, JJ" <<a href="mailto:j.ouwehand@vumc.nl">j.ouwehand@vumc.nl</a>><br>
Sent by: <a href="mailto:gpfsug-discuss-bounces@spectrumscale.org">gpfsug-discuss-bounces@spectrumscale.org</a><br>
To: "<a href="mailto:gpfsug-discuss@spectrumscale.org">gpfsug-discuss@spectrumscale.org</a>" <<a href="mailto:gpfsug-discuss@spectrumscale.org">gpfsug-discuss@spectrumscale.org</a>><br>
Cc:<br>
Subject: [gpfsug-discuss] number of SMBD processes<br>
Date: Mon, Oct 2, 2017 6:35 AM<br>
<o:p></o:p></span></p>
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<p><span lang="EN-US" style="font-size:10.5pt;font-family:"Arial","sans-serif"">Hello,</span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p><span lang="EN-US" style="font-size:10.5pt;font-family:"Arial","sans-serif""> </span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p><span lang="EN-US" style="font-size:10.5pt;font-family:"Arial","sans-serif"">Since we use new “IBM Spectrum Scale SMB CES” nodes, we see that that the number of SMBD processes has increased significantly from ~ 4,000 to ~ 7,500. We also see that the SMBD
processes are not closed.</span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p><span lang="EN-US" style="font-size:10.5pt;font-family:"Arial","sans-serif""> </span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p><span lang="EN-US" style="font-size:10.5pt;font-family:"Arial","sans-serif"">This is likely because the Samba global-parameter “deadtime” is missing.</span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p><span lang="EN-US" style="font-size:10.5pt;font-family:"Arial","sans-serif""> </span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p><span lang="EN-US" style="font-size:10.5pt;font-family:"Arial","sans-serif"">------------</span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New""><a href="https://www.samba.org/samba/docs/using_samba/ch11.html">https://www.samba.org/samba/docs/using_samba/ch11.html</a></span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">This global option sets the number of minutes that Samba will wait for an inactive client before closing its session with the Samba server. A client is considered inactive when it has
no open files and no data is being sent from it. The default value for this option is 0, which means that Samba never closes any connection, regardless of how long they have been inactive. This can lead to unnecessary consumption of the server's resources
by inactive clients. We recommend that you override the default as follows:</span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New""> </span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">[global]</span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New""> deadtime = 10</span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p><span lang="EN-US" style="font-size:10.5pt;font-family:"Arial","sans-serif"">------------</span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p><span lang="EN-US" style="font-size:10.5pt;font-family:"Arial","sans-serif""> </span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p><span lang="EN-US" style="font-size:10.5pt;font-family:"Arial","sans-serif"">Is this Samba parameter “deadtime” supported by IBM?</span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p><span lang="EN-US" style="font-size:10.5pt;font-family:"Arial","sans-serif""> </span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p><span lang="EN-US" style="font-size:10.5pt;font-family:"Arial","sans-serif""> </span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p style="text-autospace:none"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">Kindly regards,</span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p style="text-autospace:none"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black"> </span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p style="text-autospace:none"><b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">Jaap Jan Ouwehand</span></b><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><br>
</span><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">ICT Specialist (Storage & Linux)</span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p style="text-autospace:none"><span lang="EN-US" style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">VUmc - ICT</span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p style="text-autospace:none"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black"> </span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p style="text-autospace:none"><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><img border="0" width="160" height="62" id="Afbeelding_x0020_1" src="cid:image001.gif@01D33D19.085FA900" alt="VUmc_logo_samen_kiezen_voor_beter"><o:p></o:p></span></p>
<p style="text-autospace:none"><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><br>
</span><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#1F497D"> </span><span style="font-size:10.5pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p><span style="font-size:10.5pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">_______________________________________________<br>
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