<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Windows-1252">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:Courier;
panose-1:2 0 5 0 0 0 0 0 0 0;}
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
font-size:12.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
pre
{mso-style-priority:99;
mso-style-link:"HTML Preformatted Char";
margin:0in;
font-size:10.0pt;
font-family:"Courier New",serif;}
span.HTMLPreformattedChar
{mso-style-name:"HTML Preformatted Char";
mso-style-priority:99;
mso-style-link:"HTML Preformatted";
font-family:"Courier New",serif;}
span.EmailStyle22
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style>
</head>
<body lang="EN-US" link="blue" vlink="purple" style="word-wrap:break-word">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt">Im not sure why lnetctl import wouldnt correctly set discovery. Might be a bug. You can try setting the kernel module parameter to disable discovery:<br>
<br>
options lnet lnet_peer_discovery_disabled=1<br>
<br>
This obviously requires LNet to be reloaded.<br>
<br>
I would not recommend toggling discovery via the CLI as there are some bugs with correctly dealing with the fallout of that (peers going from MR enabled to MR disabled).<br>
<br>
Chris Horn<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">lustre-discuss <lustre-discuss-bounces@lists.lustre.org> on behalf of Riccardo Veraldi <riccardo.veraldi@cnaf.infn.it><br>
<b>Date: </b>Monday, September 13, 2021 at 5:25 PM<br>
<b>To: </b>Vicker, Darby J. (JSC-EG111)[Jacobs Technology, Inc.] <darby.vicker-1@nasa.gov>, lustre-discuss@lists.lustre.org <lustre-discuss@lists.lustre.org><br>
<b>Subject: </b>Re: [lustre-discuss] Disabling multi-rail dynamic discovery<o:p></o:p></span></p>
</div>
<p>I supposed you removed the /etc/modprobe.d/lustre.conf completely.<o:p></o:p></p>
<p>I only have the lnet service enabled at startup, I do not start any lustre3 service, but I am running lustre 2.12.0 sorry not 2.14<o:p></o:p></p>
<p>so something might be different.<o:p></o:p></p>
<p>Did you start over with a clean configuration ?<o:p></o:p></p>
<p>Did you reboot your system to make sure it picks up the new config ? At least for me sometimes the lnet module does not unload correctly.<o:p></o:p></p>
<p>Also I have to mention in my setup I did disable discovery also on the OSSes not only client side.<o:p></o:p></p>
<p>Generally it is not advisable to disable Multi-rail unless you have backward compatibility issues with older lustre peers.<o:p></o:p></p>
<p>But disabling discovery will also disable Multi-rail.<o:p></o:p></p>
<p>You can try with <o:p></o:p></p>
<p>lenetctl set discovery 0<o:p></o:p></p>
<p>as you already did,<o:p></o:p></p>
<p>then you do<o:p></o:p></p>
<p>lnetctl -b export > /etc/lnet.conf<o:p></o:p></p>
<p>check discovery is set to 0 in the file and if not edit it and set it to 0.<o:p></o:p></p>
<p>reboot and see if things changes.<o:p></o:p></p>
<p>If anyway you did not define any tcp interface in lnet.conf you should not see any tcp peers.<o:p></o:p></p>
<p><o:p> </o:p></p>
<div>
<p class="MsoNormal">On 9/13/21 2:59 PM, Vicker, Darby J. (JSC-EG111)[Jacobs Technology, Inc.] wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span style="font-size:11.0pt">Thanks Rick. I removed my lnet modprobe options and adapted my lnet.conf file to:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier"># cat /etc/lnet.conf
</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier">ip2nets:</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier">- net-spec: o2ib1</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier"> interfaces:</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier"> 0: ib0</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier">global:</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier"> discovery: 0</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier">#</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Now "lnetctl export" doesn't have any reference to NIDs on the other networks, so that's good. However, I'm still seeing some values that concern me:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier"># lnetctl export | grep -e Multi -e discover | sort -u</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier"> discovery: 1</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier"> Multi-Rail: True</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier">#</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Any idea why discovery is still 1 if I'm specifying that to 0 in the lnet.conf file? I'm a little concerned that with Multi-Rail still True and discovery on, the client could still find its way back to the
TCP route. </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="color:black">From: </span></b><span style="color:black">Riccardo Veraldi
<a href="mailto:riccardo.veraldi@cnaf.infn.it"><riccardo.veraldi@cnaf.infn.it></a><br>
<b>Date: </b>Monday, September 13, 2021 at 3:16 PM<br>
<b>To: </b>"Vicker, Darby J. (JSC-EG111)[Jacobs Technology, Inc.]" <a href="mailto:darby.vicker-1@nasa.gov"><darby.vicker-1@nasa.gov></a>, <a href="mailto:lustre-discuss@lists.lustre.org">"lustre-discuss@lists.lustre.org"</a>
<a href="mailto:lustre-discuss@lists.lustre.org"><lustre-discuss@lists.lustre.org></a><br>
<b>Subject: </b>[EXTERNAL] Re: [lustre-discuss] Disabling multi-rail dynamic discovery</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
</div>
<p>I would use configuration on /etc/lnet.conf and I would not use anymore the older style configuration in
<o:p></o:p></p>
<p><span style="font-family:Courier">/etc/modprobe.d/lustre.conf </span><o:p></o:p></p>
<p class="MsoNormal">for example in my /etc/lnet.conf configuration I have: <o:p>
</o:p></p>
<p><b><span style="font-family:Courier">ip2nets:<br>
- net-spec: o2ib<br>
interfaces:<br>
0: ib0<br>
- net-spec: tcp<br>
interfaces:<br>
0: enp24s0f0<br>
global:<br>
discovery: 0</span></b><o:p></o:p></p>
<p>As I disabled the auto discovery.<o:p></o:p></p>
<p>Regarding ko2ib you can just use /etc/modprobe.d/ko2iblnd.conf<o:p></o:p></p>
<p>Mine looks like this:<o:p></o:p></p>
<p><b><span style="font-family:"Courier New",serif">options ko2iblnd peer_credits=128 peer_credits_hiw=64 credits=1024 ntx=2048 map_on_demand=256 fmr_pool_size=2048 fmr_flush_trigger=512 fmr_cache=1 conns_per_peer=4</span></b><o:p></o:p></p>
<p>Hope it helps.<o:p></o:p></p>
<p>Rick<o:p></o:p></p>
<p> <o:p></o:p></p>
<div>
<p class="MsoNormal">On 9/13/21 1:53 PM, Vicker, Darby J. (JSC-EG111)[Jacobs Technology, Inc.] via lustre-discuss wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span style="font-size:11.0pt">Hello,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I would like to know how to turn off auto discovery of peers on a client. This seems like it should be straight forward but we can't get it to work. Please fill me in on what I'm missing.
</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">We recently upgraded our servers to 2.14. Our servers are multi-homed (1 tcp network and 2 separate IB networks) but we want them to be single rail. On one of our clusters we are still using the 2.12.6 client
and it uses one of the IB networks for lustre. The modprobe file from one of the client nodes:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier"># cat /etc/modprobe.d/lustre.conf
</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier">options lnet networks=o2ib1(ib0)</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier">options ko2iblnd map_on_demand=32</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier">#</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">The client does have a route to the TCP network. This is intended to allow jobs on the compute nodes to access licenese servers, not for any serious I/O. We recently discovered that due to some instability
in the IB fabric, the client was trying to fail over to tcp:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif"># dmesg | grep Lustre</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">[ 250.205912] Lustre: Lustre: Build Version: 2.12.6</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">[ 255.886086] Lustre: Mounted scratch-client</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">[ 287.247547] Lustre: 3472:0:(client.c:2146:ptlrpc_expire_one_request()) @@@ Request sent has timed out for sent delay: [sent 1630699139/real 0] req@ffff98deb9358480 x1709911947878336/t0(0)
o9-><a href="mailto:hpfs-fsl-OST0001-osc-ffff9880cfb80000@192.52.98.33@tcp:28/4">hpfs-fsl-OST0001-osc-ffff9880cfb80000@192.52.98.33@tcp:28/4</a> lens 224/224 e 0 to 1 dl 1630699145 ref 2 fl Rpc:XN/0/ffffffff rc 0/-1</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">[ 739.832744] Lustre: 3526:0:(client.c:2146:ptlrpc_expire_one_request()) @@@ Request sent has timed out for sent delay: [sent 1630699591/real 0] req@ffff98deb935da00 x1709911947883520/t0(0)
o400-><a href="mailto:scratch-MDT0000-mdc-ffff98b0f1fc0800@192.52.98.31@tcp:12/10">scratch-MDT0000-mdc-ffff98b0f1fc0800@192.52.98.31@tcp:12/10</a> lens 224/224 e 0 to 1 dl 1630699598 ref 2 fl Rpc:XN/0/ffffffff rc 0/-1</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">[ 739.832755] Lustre: 3526:0:(client.c:2146:ptlrpc_expire_one_request()) Skipped 5 previous similar messages</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">[ 739.832762] LustreError: 166-1: MGC10.150.100.30@o2ib1: Connection to MGS (at 192.52.98.30@tcp) was lost; in progress operations using this service will fail</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">[ 739.832769] Lustre: hpfs-fsl-MDT0000-mdc-ffff9880cfb80000: Connection to hpfs-fsl-MDT0000 (at 192.52.98.30@tcp) was lost; in progress operations using this service will wait
for recovery to complete</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">[ 1090.978619] LustreError: 167-0: scratch-MDT0000-mdc-ffff98b0f1fc0800: This client was evicted by scratch-MDT0000; in progress operations using this service will fail.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I'm pretty sure this is due to the auto discovery. Again, from a client:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<pre style="margin-left:.5in"># lnetctl export | grep -e Multi -e discover | sort -u<o:p></o:p></pre>
<pre style="margin-left:.5in"> discovery: 0<o:p></o:p></pre>
<pre style="margin-left:.5in"> Multi-Rail: True<o:p></o:p></pre>
<pre style="margin-left:.5in"># <o:p></o:p></pre>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">We want to restrict lustre to only the IB NID but its not clear exactly how to do that.
</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt">Here is one attempt:<br>
<br>
<br>
</span><span style="font-size:11.0pt;font-family:Courier">[root@r1i1n18 lnet]# service lustre3 stop</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier">Shutting down lustre mounts
</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier">Lustre modules successfully unloaded</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier">[root@r1i1n18 lnet]# lsmod | grep lnet</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier">[root@r1i1n18 lnet]# cat /etc/lnet.conf
</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier">global:</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier"> discovery: 0</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier">[root@r1i1n18 lnet]# service lustre3 start</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier">Mounting /ephemeral... done.</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier">Mounting /nobackup... done.</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier">[root@r1i1n18 lnet]# lnetctl export | grep -e Multi -e discover | sort -u</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier"> discovery: 1</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier"> Multi-Rail: True</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:Courier">[root@r1i1n18 lnet]#</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">And a similar attempt (same lnet.conf file), but trying to turn off the discovery before doing the mounts:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<pre style="margin-left:.5in">[root@r1i1n18 lnet]# service lustre3 stop<o:p></o:p></pre>
<pre style="margin-left:.5in">Shutting down lustre mounts <o:p></o:p></pre>
<pre style="margin-left:.5in">Lustre modules successfully unloaded<o:p></o:p></pre>
<pre style="margin-left:.5in">[root@r1i1n18 lnet]# modprobe lnet<o:p></o:p></pre>
<pre style="margin-left:.5in">[root@r1i1n18 lnet]# lnetctl set discovery 0<o:p></o:p></pre>
<pre style="margin-left:.5in">[root@r1i1n18 lnet]# service lustre3 start<o:p></o:p></pre>
<pre style="margin-left:.5in">Mounting /ephemeral... done.<o:p></o:p></pre>
<pre style="margin-left:.5in">Mounting /nobackup... done.<o:p></o:p></pre>
<pre style="margin-left:.5in">[root@r1i1n18 lnet]# lnetctl export | grep -e Multi -e discover | sort -u<o:p></o:p></pre>
<pre style="margin-left:.5in"> discovery: 0<o:p></o:p></pre>
<pre style="margin-left:.5in"> Multi-Rail: True<o:p></o:p></pre>
<pre style="margin-left:.5in">[root@r1i1n18 lnet]# <o:p></o:p></pre>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">If someone can point me in the right direction, I'd appreciate it.
</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Thanks,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Darby</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><br>
<br>
<br>
</span><o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>lustre-discuss mailing list<o:p></o:p></pre>
<pre><a href="mailto:lustre-discuss@lists.lustre.org">lustre-discuss@lists.lustre.org</a><o:p></o:p></pre>
<pre><a href="https://gcc02.safelinks.protection.outlook.com/?url=http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org&data=04|01|darby.vicker-1@nasa.gov|b2a81e07db45418e29df08d976fbbebd|7005d45845be48ae8140d43da96dd17b|0|0|637671645889714604|Unknown|TWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0=|3000&sdata=oRqJx/cdY29ppvvulneydVZZY/rm1vD8EddtDofafgk=&reserved=0">http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org</a><o:p></o:p></pre>
</blockquote>
</blockquote>
</div>
</body>
</html>