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-2029 Lustre <p>While messing around in cache control settings I noticed that I can no longer permanently set readcache_max_filesize with any of the known methods. In all cases I get errors:</p> <p><span class="error">&#91;root@mgs ~&#93;</span># lctl conf_param obdfilter.lustre-OST0003.readcache_max_filesize=1M<br/> error: conf_param: Cannot allocate memory</p> <p><span class="error">&#91;root@mgs ~&#93;</span># lctl conf_param lustre.obdfilter.readcache_max_filesize=1M<br/> Make sure cfg_device is set first.</p> <p>Per a tips and tricks discussion adilger gave at LUG2010 the recommended method was:</p> <p>&lt;fs&gt;.&lt;subsys&gt;.readcache_max_filesize however this no longer appears to work.</p> <p>Am I just doing this wrong or is this really a bug?</p> <p>-cf</p> LU-2029

Can no longer permanently set readcache_max_filesize

Bug Major Resolved Not a Bug Jian Yu Colin Faber [X] Tue, 25 Sep 2012 14:47:46 +0000 Fri, 28 Sep 2012 08:56:28 +0000 Fri, 28 Sep 2012 08:56:28 +0000 0 3 <p>Yujian </p> <p>could you please see if this can be reproduced? </p> <p>thanks</p> <p>Peter</p> <p>Hi Peter, it seems format change addresses this:</p> <p>lctl conf_param &lt;fs&gt;-OST&lt;NNNN&gt;.ost.readcache_max_filesize=NN</p> <p>So at this point this can be addressed as documentation issue.</p> <p>-cf</p> <p>Hello Colin,</p> <p>I just checked Lustre manual and found the following section described the format clearly:</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>13.8.3.2. Setting Permanent Parameters Use the lctl conf_param command to set permanent parameters. In general, the lctl conf_param command can be used to specify any parameter settable in a /proc/fs/lustre file, with its own OBD device. The lctl conf_param command uses this syntax (same as the mkfs.lustre and tunefs.lustre commands): &lt;obd|fsname&gt;.&lt;obdtype&gt;.&lt;proc_file_name&gt;=&lt;value&gt; Here are a few examples of lctl conf_param commands: $ mgs&gt; lctl conf_param testfs-MDT0000.sys.timeout=40 $ lctl conf_param testfs-MDT0000.mdt.identity_upcall=NONE $ lctl conf_param testfs.llite.max_read_ahead_mb=16 $ lctl conf_param testfs-MDT0000.lov.stripesize=2M $ lctl conf_param testfs-OST0000.osc.max_dirty_mb=29.15 $ lctl conf_param testfs-OST0000.ost.client_cache_seconds=15 $ lctl conf_param testfs.sys.timeout=40 Caution Parameters specified with the lctl conf_param command are set permanently in the file system's configuration file on the MGS. </pre> </div></div> <p>So, I think we can close this ticket.</p> Development Rank 1|hzv3vj: Rank (Obsolete) 4156 Severity