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-3015 Lustre <p>In this hunk from udmu_objs_count_estimate():</p> <div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent"> <pre class="code-java"> est_refdblocks = (refdbytes &gt;&gt; SPA_MAXBLOCKSHIFT) + (OSD_DNODE_EST_COUNT &lt;&lt; OSD_DNODE_EST_BLKSHIFT); est_usedobjs = usedobjs + OSD_DNODE_EST_COUNT; </pre> </div></div> <p>OSD_DNODE_EST_COUNT should be right-shifted, not left-shifted. This typo leads to a larger-than-actual dnode size estimation, which further causes overly conservative os_ffree (number of available objects) values, especially for MDTs.</p> LU-3015

A typo in udmu_objs_count_estimate() causing overly conservative os_ffree values

Bug Major Resolved Fixed Li Wei Li Wei Fri, 22 Mar 2013 07:27:43 +0000 Tue, 15 Oct 2013 23:55:43 +0000 Fri, 31 May 2013 21:10:41 +0000 Lustre 2.4.0 Lustre 2.4.1 Lustre 2.5.0 0 2 <p>Current os_ffree values for "empty" 1 GB ZFS-based MDT and OSTs:</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>[root@linux tests]# df -h Filesystem Size Used Avail Use% Mounted on [...] lustre-mdt1/mdt1 929M 3.0M 924M 1% /mnt/mds1 lustre-ost1/ost1 929M 1.3M 926M 1% /mnt/ost1 lustre-ost2/ost2 929M 1.3M 926M 1% /mnt/ost2 linux@tcp:/lustre 1.9G 2.5M 1.9G 1% /mnt/lustre [root@linux tests]# df -i Filesystem Inodes IUsed IFree IUse% Mounted on [...] lustre-mdt1/mdt1 7583 178 7405 3% /mnt/mds1 lustre-ost1/ost1 7631 212 7419 3% /mnt/ost1 lustre-ost2/ost2 7631 212 7419 3% /mnt/ost2 linux@tcp:/lustre 7583 178 7405 3% /mnt/lustre </pre> </div></div> <p>With the typo fixed:</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>[root@linux tests]# df -h Filesystem Size Used Avail Use% Mounted on [...] lustre-mdt1/mdt1 929M 2.9M 924M 1% /mnt/mds1 lustre-ost1/ost1 929M 1.3M 926M 1% /mnt/ost1 lustre-ost2/ost2 929M 1.3M 926M 1% /mnt/ost2 linux@tcp:/lustre 1.9G 2.5M 1.9G 1% /mnt/lustre [root@linux tests]# df -i Filesystem Inodes IUsed IFree IUse% Mounted on [...] lustre-mdt1/mdt1 161966 178 161788 1% /mnt/mds1 lustre-ost1/ost1 223825 212 223613 1% /mnt/ost1 lustre-ost2/ost2 223825 212 223613 1% /mnt/ost2 linux@tcp:/lustre 161966 178 161788 1% /mnt/lustre </pre> </div></div> <p><a href="http://review.whamcloud.com/5806" class="external-link" target="_blank" rel="nofollow noopener">http://review.whamcloud.com/5806</a></p> <p>Patch landed to master. Let me know if more patches are needed and I will reopen this ticket.</p> Development Rank 1|hzvlyf: Rank (Obsolete) 7336 Severity