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/LUDOC-49 Lustre Documentation <p>The size of the MDT you need is proportional to the number of files you want to store and the number of stripes you anticipate using. Strips are not mentioned in the Manual in the section on calculating MTS size.</p> <p><a href="https://build.whamcloud.com/job/lustre-manual/lastSuccessfulBuild/artifact/lustre_manual.html#dbdoclet.50438256_87676" class="external-link" target="_blank" rel="nofollow noopener">https://build.whamcloud.com/job/lustre-manual/lastSuccessfulBuild/artifact/lustre_manual.html#dbdoclet.50438256_87676</a></p> <p>Cliff describes the situation thus:</p> <div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent"> <pre class="code-java">[3:00:02 PM CDT] Richard Henwood: What is an approximate maximum number of files that I can have <span class="code-keyword">if</span> my MDT is 450GB? The Manual says 2KB/inode which gives: 225 000 000. Does that sounds about right? [3:19:46 PM CDT] Cliff White: inode size depends on stripe count. If no striping, afaik could be 512bytes/inode [3:20:15 PM CDT] Cliff White: 2kb is somewhere arount 80 stripes, i think, ~4.5K is 160 stripes </pre> </div></div> LUDOC-49

MDT calculations don't include striping adjustments (Ch 5)

Improvement Minor Resolved Fixed Richard Henwood Richard Henwood QContent Mon, 19 Mar 2012 16:27:38 +0000 Mon, 26 Aug 2013 16:18:54 +0000 Mon, 26 Aug 2013 16:18:54 +0000 0 2 <p>Richard to get more information on this request.</p> <p>Removed obsolete note from section 5.2.1:<br/> Inode size depends on stripe count. Without any stripes an inode allocation of 512 bytes might be sufficient. As striping grows to ~80 stripes per file, the inode allocation is around 2KB. At 160 stripes, a rough estimate for inode allocation is 4.5KB</p> <p>Changes are ready for review at <a href="http://review.whamcloud.com/#/c/6847/" class="external-link" target="_blank" rel="nofollow noopener">http://review.whamcloud.com/#/c/6847/</a></p> <p>Changes merged</p> Related LUDOC-102 Business Value 18.0 Development Rank 1|hzvkzz: Rank (Obsolete) 7163