https://jira.whamcloud.com This file is an XML representation of an issue en-us 9.4.14 940014 05-12-2023 https://jira.whamcloud.com/browse/LU-11351 Lustre <p>When you set max_sectors_kb=0 as a persistent mount options it fails to mount</p> <p>You get this error:</p> <div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent"> <pre class="code-java"> [1474.604509] LDISKFS-fs (dm-1): Unrecognized mount option <span class="code-quote">"max_sectors_kb=0"</span> or missing value</pre> </div></div> <p>Passing it as a mount option works.</p> LU-11351

using max_sectors_kb=0 in persistent mount options doesn't work

Bug Minor Resolved Fixed Peter Jones Mahmoud Hanafi Fri, 7 Sep 2018 21:52:51 +0000 Thu, 27 Feb 2020 12:26:51 +0000 Thu, 27 Feb 2020 12:26:51 +0000 Lustre 2.10.5 0 5 <p>How are you setting <tt>max_sectors_kb=0</tt> as a persistent mount option? This option is parsed by <tt>mount.lustre</tt>, but it looks like it is being passed to ldiskfs, which doesn't understand it.</p> <p>Currently we are passing during mount</p> <p>mount -t lustre -o max_sectors_kb=0 ....</p> <p>This should work when set in persistent mount settings.</p> <p>Sorry, your answer still isn't clear to me. When you say "set in persistent mount settings" do you mean "set in <tt>/etc/fstab</tt>" or something else?</p> <p>Persistent ---&gt; setting the option via tunefs.lustre</p> <div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent"> <pre class="code-java"> tunefs.lustre --mountfsoptions=<span class="code-quote">"acl,errors=panic,user_xattr,max_sectors_kb=0"</span> </pre> </div></div> <p> </p> <p>The <tt>tunefs.lustre</tt> mount options are for the underlying filesystem. For Lustre mounts, you should add this option to <tt>/etc/fstab</tt>.</p> <p>If you run</p> <div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent"> <pre class="code-java"> mount -t lustre /dev/ostx /mnt/ost</pre> </div></div> <p>This will not use any of the default values stored using tunefs.lustre?</p> <p> </p> <p>Yes, it will. But these options are applied to the underlying filesystem mount inside the kernel. The options in /etc/fstab are parsed by <tt>mount.lustre</tt>, which applies this particular tunable in userspace. </p> <p>Please close this</p> Development Rank 1|i001zz: Rank (Obsolete) 9223372036854775807 Severity