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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Hello Salvatore,<br>
<br>
as you wrote that you have about 700 clients, maybe also the tuning recommendations for large GPFS clusters are helpful for you. They are on the developerworks GPFS wiki:<br>
<br>
<a href="https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/General%20Parallel%20File%20System%20%28GPFS%29/page/Best%20Practices%20Network%20Tuning" target="_blank">https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/General%20Parallel%20File%20System%20%28GPFS%29/page/Best%20Practices%20Network%20Tuning</a><br>
<br>
<br>
To my experience especially "failureDetectionTime" and "minMissedPingTimeout" may help in case of expelled nodes.<br>
<br>
<br>
In case you use InfiniBand, for RDMA, there also is a "Best Practices RDMA Tuning" page:<br>
<br>
<a href="https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/General%20Parallel%20File%20System%20%28GPFS%29/page/Best%20Practices%20RDMA%20Tuning" target="_blank">https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/General%20Parallel%20File%20System%20%28GPFS%29/page/Best%20Practices%20RDMA%20Tuning</a><br>
<br>
<br>
<br>
Regards<br>
Birgit<br>
<br>
<div style="font-family: Times New Roman; color: #000000; font-size: 16px">
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<div style="direction: ltr;" id="divRpF534040"><font color="#000000" face="Tahoma" size="2"><b>From:</b> gpfsug-discuss-bounces@gpfsug.org [gpfsug-discuss-bounces@gpfsug.org] on behalf of Salvatore Di Nardo [sdinardo@ebi.ac.uk]<br>
<b>Sent:</b> Monday, July 13, 2015 3:29 PM<br>
<b>To:</b> Vic Cornell<br>
<b>Cc:</b> gpfsug main discussion list<br>
<b>Subject:</b> Re: [gpfsug-discuss] data interface and management infercace.<br>
</font><br>
</div>
<div></div>
<div><font size="-1">Hello Vic.<br>
We are currently draining our gpfs to do all the recabling to add a management network, but looking what the admin interface does ( man mmchnode ) it says something different:<br>
<br>
</font>
<blockquote>
<blockquote><big><font size="-1"><big><tt>--admin-interface={hostname | ip_address}</tt></big></font></big><br>
<big><font size="-1"><big><tt> Specifies the name of the node to be used by GPFS administration commands when communicating between nodes. The admin node name must be specified as an IP</tt></big></font></big><br>
<big><font size="-1"><big><tt> address or a hostname that is resolved by the host command to the desired IP address. If the keyword DEFAULT is specified, the admin interface for the</tt></big></font></big><br>
<big><font size="-1"><big><tt> node is set to be equal to the daemon interface for the node.</tt></big></font></big><br>
</blockquote>
</blockquote>
<big><font size="-1"><big><tt></tt></big></font></big><font size="-1"><br>
So, seems used only for commands propagation, hence have nothing to do with the node-to-node traffic. Infact the other interface description is:<br>
</font><big><font size="-1"><big><tt><br>
</tt></big></font></big>
<blockquote>
<blockquote><big><font size="-1"><big><tt> --daemon-interface={hostname | ip_address}</tt></big></font></big><br>
<big><font size="-1"><big><tt> Specifies the host name or IP address
</tt><tt><u><b>to be used by the GPFS daemons for node-to-node communication</b></u></tt><tt>. The host name or IP address must refer to the commu-</tt></big></font></big><br>
<big><font size="-1"><big><tt> nication adapter over which the GPFS daemons communicate. Alias interfaces are not allowed. Use the original address or a name that is resolved by the</tt></big></font></big><br>
<big><font size="-1"><big><tt> host command to that original address.</tt></big></font></big></blockquote>
</blockquote>
<big><font size="-1"></font></big><font size="-1"><br>
The "expired lease" issue and file locking mechanism a( most of our expells happens when 2 clients try to write in the same file) are exactly node-to node-comunication, so im wondering what's the point to separate the "admin network". I want to be sure to
plan the right changes before we do a so massive task. We are talking about adding a new interface on 700 clients, so the recabling work its not small.
<br>
<br>
<br>
Regards,<br>
Salvatore<br>
<br>
<br>
</font><br>
<div class="moz-cite-prefix">On 13/07/15 14:00, Vic Cornell wrote:<br>
</div>
<blockquote type="cite">Hi Salavatore,
<div class=""><br class="">
</div>
<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>Does your GSS have the facility for a 1GbE “management” network? If so I think that changing the “admin” node names of the cluster members to a set of IPs on the management network would
give you the split that you need.</div>
<div class=""><br class="">
</div>
<div class="">What about the clients? Can they also connect to a separate admin network?</div>
<div class=""><br class="">
</div>
<div class="">Remember that if you are using multi-cluster all of the nodes in both networks must share the same admin network.</div>
<div class="">
<div class="">
<div class=""><br class="">
</div>
</div>
</div>
<div class="">
<div class="" style="color:rgb(0,0,0); font-family:Helvetica; font-size:14px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span>Kind Regards,</span></div>
<div class="" style="color:rgb(0,0,0); font-family:Helvetica; font-size:14px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span><br class="">
</span></div>
<div class="" style="color:rgb(0,0,0); font-family:Helvetica; font-size:14px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span>Vic</span></div>
<span style="color:rgb(0,0,0); font-family:Helvetica; font-size:14px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px"><br class="Apple-interchange-newline">
</span><span></span></div>
<br class="">
<div>
<blockquote type="cite" class="">
<div class="">On 13 Jul 2015, at 13:31, Salvatore Di Nardo <<a href="mailto:sdinardo@ebi.ac.uk" class="" target="_blank">sdinardo@ebi.ac.uk</a>> wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div bgcolor="#FFFFFF" class=""><font class="" size="-1">Anyone? </font><br class="">
<br class="">
<div class="moz-cite-prefix">On 10/07/15 11:07, Salvatore Di Nardo wrote:<br class="">
</div>
<blockquote type="cite" class=""><font class="" size="-1">Hello guys.<br class="">
Quite a while ago i mentioned that we have a big expel issue on our gss ( first gen) and white a lot people suggested that the root cause could be that we use the same interface for all the traffic, and that we should split the data network from the admin
network. Finally we could plan a downtime and we are migrating the data out so, i can soon safelly play with the change, but looking what exactly i should to do i'm a bit puzzled. Our mmlscluster looks like this:<br class="">
<br class="">
</font>
<blockquote class="">
<blockquote class="">
<blockquote class=""><tt class=""><font class="" size="-1">GPFS cluster information</font></tt><tt class=""><br class="">
</tt><tt class=""><font class="" size="-1">========================</font></tt><tt class=""><br class="">
</tt><tt class=""><font class="" size="-1"> GPFS cluster name: <a href="http://GSS.ebi.ac.uk" class="" target="_blank">
GSS.ebi.ac.uk</a></font></tt><tt class=""><br class="">
</tt><tt class=""><font class="" size="-1"> GPFS cluster id: 17987981184946329605</font></tt><tt class=""><br class="">
</tt><tt class=""><font class="" size="-1"> GPFS UID domain: <a href="http://GSS.ebi.ac.uk" class="" target="_blank">
GSS.ebi.ac.uk</a></font></tt><tt class=""><br class="">
</tt><tt class=""><font class="" size="-1"> Remote shell command: /usr/bin/ssh</font></tt><tt class=""><br class="">
</tt><tt class=""><font class="" size="-1"> Remote file copy command: /usr/bin/scp</font></tt><tt class=""><br class="">
</tt><tt class=""><br class="">
</tt><tt class=""><font class="" size="-1">GPFS cluster configuration servers:</font></tt><tt class=""><br class="">
</tt><tt class=""><font class="" size="-1">-----------------------------------</font></tt><tt class=""><br class="">
</tt><tt class=""><font class="" size="-1"> Primary server: <a href="http://gss01a.ebi.ac.uk" class="" target="_blank">
gss01a.ebi.ac.uk</a></font></tt><tt class=""><br class="">
</tt><tt class=""><font class="" size="-1"> Secondary server: <a href="http://gss02b.ebi.ac.uk" class="" target="_blank">
gss02b.ebi.ac.uk</a></font></tt><tt class=""><br class="">
</tt><tt class=""><br class="">
</tt><tt class=""><font class="" size="-1"> Node Daemon node name IP address Admin node name Designation</font></tt><tt class=""><br class="">
</tt><tt class=""><font class="" size="-1">-----------------------------------------------------------------------</font></tt><tt class=""><br class="">
</tt><tt class=""><font class="" size="-1"> 1 <a href="http://gss01a.ebi.ac.uk" class="" target="_blank">
gss01a.ebi.ac.uk</a> 10.7.28.2 <a href="http://gss01a.ebi.ac.uk" class="" target="_blank">
gss01a.ebi.ac.uk</a> quorum-manager</font></tt><tt class=""><br class="">
</tt><tt class=""><font class="" size="-1"> 2 <a href="http://gss01b.ebi.ac.uk" class="" target="_blank">
gss01b.ebi.ac.uk</a> 10.7.28.3 <a href="http://gss01b.ebi.ac.uk" class="" target="_blank">
gss01b.ebi.ac.uk</a> quorum-manager</font></tt><tt class=""><br class="">
</tt><tt class=""><font class="" size="-1"> 3 <a href="http://gss02a.ebi.ac.uk" class="" target="_blank">
gss02a.ebi.ac.uk</a> 10.7.28.67 <a href="http://gss02a.ebi.ac.uk" class="" target="_blank">
gss02a.ebi.ac.uk</a> quorum-manager</font></tt><tt class=""><br class="">
</tt><tt class=""><font class="" size="-1"> 4 <a href="http://gss02b.ebi.ac.uk" class="" target="_blank">
gss02b.ebi.ac.uk</a> 10.7.28.66 <a href="http://gss02b.ebi.ac.uk" class="" target="_blank">
gss02b.ebi.ac.uk</a> quorum-manager</font></tt><tt class=""><br class="">
</tt><tt class=""><font class="" size="-1"> 5 <a href="http://gss03a.ebi.ac.uk" class="" target="_blank">
gss03a.ebi.ac.uk</a> 10.7.28.34 <a href="http://gss03a.ebi.ac.uk" class="" target="_blank">
gss03a.ebi.ac.uk</a> quorum-manager</font></tt><tt class=""><br class="">
</tt><tt class=""><font class="" size="-1"> 6 <a href="http://gss03b.ebi.ac.uk" class="" target="_blank">
gss03b.ebi.ac.uk</a> 10.7.28.35 <a href="http://gss03b.ebi.ac.uk" class="" target="_blank">
gss03b.ebi.ac.uk</a> quorum-manager</font></tt><tt class=""><br class="">
</tt></blockquote>
</blockquote>
</blockquote>
<font class="" size="-1"><br class="">
It was my understanding that the "admin node" should use a different interface ( a 1g link copper should be fine), while the daemon node is where the data was passing , so should point to the bonded 10g interfaces. but when i read the mmchnode man page i start
to be quite confused. It says:<br class="">
<br class="">
</font><font class="" size="-1"><tt class=""> --daemon-interface={hostname | ip_address}</tt><tt class=""><br class="">
</tt><tt class=""> Specifies the host name or IP address
<u class=""><b class="">to be used by the GPFS daemons for node-to-node communication</b></u>. The host name or IP address must refer to the communication adapter over which the GPFS daemons communicate.
<br class="">
Alias interfaces are not allowed. Use the original address or a name that is resolved by the host command to that original address.</tt><tt class="">
</tt><tt class=""><br class="">
</tt><tt class=""> </tt><tt class=""><br class="">
</tt><tt class=""> --admin-interface={hostname | ip_address}</tt><tt class=""><br class="">
</tt><tt class=""> Specifies the name of the node to be used by GPFS administration commands when communicating between nodes. The admin node name must be specified as an IP address or a hostname that is resolved by the host command
<br class="">
to</tt><tt class=""> </tt><tt class="">the desired IP address. If the keyword DEFAULT is specified, the admin interface for the node is set to be equal to the daemon interface for the node.</tt><tt class=""><br class="">
</tt></font><font class="" size="-1"><br class="">
What exactly means "node-to node-communications" ? <br class="">
Means DATA or also the "lease renew", and the token communication between the clients to get/steal the locks to be able to manage concurrent write to thr same file?
<br class="">
Since we are getting expells ( especially when several clients contends the same file ) i assumed i have to split this type of packages from the data stream, but reading the documentation it looks to me that those internal comunication between nodes use the
daemon-interface wich i suppose are used also for the data. so HOW exactly i can split them?<br class="">
</font><font class="" size="-1"><br class="">
</font><font class="" size="-1"><br class="">
Thanks in advance,<br class="">
Salvatore<br class="">
</font><font class="" size="-1"><br class="">
</font><br class="">
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