<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=utf-8">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@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;}
@font-face
{font-family:Consolas;
panose-1:2 11 6 9 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
pre
{mso-style-priority:99;
mso-style-link:"HTML Preformatted Char";
margin:0in;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";}
p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
{mso-style-priority:34;
margin-top:0in;
margin-right:0in;
margin-bottom:0in;
margin-left:.5in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
p.msonormal0, li.msonormal0, div.msonormal0
{mso-style-name:msonormal;
mso-margin-top-alt:auto;
margin-right:0in;
mso-margin-bottom-alt:auto;
margin-left:0in;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
span.HTMLPreformattedChar
{mso-style-name:"HTML Preformatted Char";
mso-style-priority:99;
mso-style-link:"HTML Preformatted";
font-family:Consolas;}
span.EmailStyle20
{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">
<div class="WordSection1">
<p class="MsoNormal">Hi, Raj.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">You wrote:<o:p></o:p></p>
<p class="MsoNormal">> I am will be very keen to test PFL in a mix env of 2.7 and 2.11 clients. If anybody has tested this, please let me know.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">As I think you are aware, 2.7 clients are not PFL capable.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The Lustre operations manual states, “Using PFL files requires both the client and server to understand the PFL file layout, which isn't available for Lustre 2.9 and earlier. And it will not prevent older clients from accessing non-PFL
files in the filesystem.” (<a href="http://doc.lustre.org/lustre_manual.xhtml#pfl">http://doc.lustre.org/lustre_manual.xhtml#pfl</a>)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">It'd probably be clearer if it told you exactly what to expect if you attempt to access a PFL file from an old client. I don’t know what errno you’d get exactly, but you should get something sane like ENOTSUP.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">-Cory<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<div>
<p class="MsoNormal">-- <o:p></o:p></p>
</div>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal" style="margin-left:.5in">On 8/31/19, 1:05 PM, "lustre-discuss on behalf of Raj" <<a href="mailto:lustre-discuss-bounces@lists.lustre.org">lustre-discuss-bounces@lists.lustre.org</a> on behalf of
<a href="mailto:rajgautam@gmail.com">rajgautam@gmail.com</a>> wrote:<o:p></o:p></p>
</div>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
</div>
<p class="MsoNormal" style="margin-left:.5in">Kirill <o:p></o:p></p>
<div>
<p class="MsoNormal" style="margin-left:.5in">We are running 2.11.x clients on 2.5.x servers (Neo 2.0) in TDS environment and haven’t seen any issues yet. Plan is to put it in production in a month or so.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in">We also have 2.11.x servers(Neo 3.1-022). I am will be very keen to test PFL in a mix env of 2.7 and 2.11 clients. If anybody has tested this, please let me know.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><br>
Thanks<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in">-Raj<br>
On Friday, August 30, 2019, Leonardo Saavedra <<a href="mailto:lsaavedr@nrao.edu">lsaavedr@nrao.edu</a>> wrote:<o:p></o:p></p>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<p class="MsoNormal" style="margin-left:.5in">On 8/29/19 5:00 PM, Kirill Lozinskiy wrote:<br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<p class="MsoNormal" style="margin-left:.5in">Hey Lustre fans!<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in">Is there anyone out there running Lustre server version 2.5.x with a Lustre client version 2.11.x? I'm curious if you are running this combination and whether or not you saw and gains or losses when you went to
the newer Lustre client. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in">We were running Lustre 2.7 client before and just recently went to 2.11. I'm trying to get a better understanding as to how common it is to have the version drift between the server and the client, as well as any
positive or negative experiences. <o:p></o:p></p>
</div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
</div>
</blockquote>
<p class="MsoNormal" style="margin-left:.5in">it works, no problem at all, in your client's logs you'll see a message like:<br>
<br>
---<br>
[60010.976717] Lustre: Lustre: Build Version: 2.10.4<br>
[60011.029258] LNet: Added LNI 10.64.102.152@tcp [8/256/0/180]<br>
[60011.029297] LNet: Accept secure, port 988<br>
[60011.042970] Lustre: Server MGS version (2.5.5.0) is much older than client. Consider upgrading server (2.10.4)<br>
---<br>
<br>
<br>
<br>
<o:p></o:p></p>
<pre style="margin-left:.5in">--<o:p></o:p></pre>
<pre style="margin-left:.5in">Leo Saavedra<o:p></o:p></pre>
<pre style="margin-left:.5in">National Radio Astronomy Observatory<o:p></o:p></pre>
<pre style="margin-left:.5in"><a href="http://www.nrao.edu" target="_blank">www.nrao.edu</a><o:p></o:p></pre>
<pre style="margin-left:.5in">+1-575-8357033<o:p></o:p></pre>
</div>
</blockquote>
</div>
</div>
</body>
</html>