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-9960 Lustre <p>While performing Rolling downgrade testing for bfs from master to 2.10, I am unable to import the zpool.</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>[root@onyx-78 ~]# zpool import lustre-mdt1 [ 939.565075] SPL: using hostid 0x61303230 This pool uses the following feature(s) not supported by this system: org.zfsonlinux:userobj_accounting (User/Group object accounting.) All unsupported features are only required for writing to the pool. The pool can be imported using '-o readonly=on'. cannot import 'lustre-mdt1': unsupported version or feature </pre> </div></div> <p>Steps Followed:</p> <p>1. Started with all clients and servers with 2.10 build 5 and build the Lustre File system<br/> 2. Upgraded OSS to master re-mounted and ran sanity.sh<br/> 3. Upgraded MDS to master , remounted and ran sanity.sh<br/> 4. Upgraded Clients to master, remounted and ran sanity.sh<br/> 5. Downgraded Clients to 2.10. remounted and ran sanity.sh<br/> 6. Downgraded MDS to 2.10, while importing zpools the above message appears and I am unable to import zpools.</p> master, 3631 zfs 0.7.1<br/> 2.10, build 5 zfs 0.6.5.9<br/> ZFS LU-9960

Rolling downgrade master to 2.10 - unable to import zpools

Bug Critical Resolved Fixed Nathaniel Clark Saurabh Tandan Fri, 8 Sep 2017 15:41:33 +0000 Sun, 15 Apr 2018 00:13:02 +0000 Thu, 21 Sep 2017 12:11:11 +0000 Lustre 2.10.0 Lustre 2.10.1 Lustre 2.11.0 Lustre 2.10.1 Lustre 2.11.0 0 8 <p>Nathaniel</p> <p>Can you please advise on this one?</p> <p>Thanks</p> <p>Peter</p> <p>This is pretty clearly the fault of the <a href="https://review.whamcloud.com/15294" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/15294</a> patch, which is enabling user quota automatically at mount time:</p> <div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent"> <pre class="code-java"><span class="code-keyword">static</span> inline bool osd_dmu_userobj_accounting_available(struct osd_device *osd) { <span class="code-keyword">if</span> (unlikely(dmu_objset_userobjspace_upgradable(osd-&gt;od_os))) dmu_objset_userobjspace_upgrade(osd-&gt;od_os); <span class="code-keyword">return</span> dmu_objset_userobjspace_present(osd-&gt;od_os); } </pre> </div></div> <p>This should instead just print a message at mount time like <tt>dnode accounting feature missing, run "zfs/zpool ..." to enable (prevents downgrade to ZFS &lt; 0.7)</tt> or similar, and leave it up to the administrator to enable this feature. It should be up to them to enable this feature.</p> <p>For our own testing, we should automatically enable this feature for newly-formatted ZFS datasets in libmount_utils_zfs.c.<br/> In theory, the check in <tt>sanity-quota.sh test_7e</tt> should be changed from a ZFS version check to a check of the feature is enabled on the pool, but if we always format new ZFS pools with this feature then we should be OK.</p> <p>I think this also needs to be included into Lustre 2.10.1 if at all possible, to avoid causing problems for users upgrading their system to use ZFS 0.7.</p> <p>Looking at zpool-features(5):</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre> userobj_accounting GUID org.zfsonlinux:userobj_accounting READ-ONLY COMPATIBLE yes DEPENDENCIES extensible_dataset This feature allows administrators to account the object usage information by user and group. This feature becomes active as soon as it is enabled and will never return to being enabled. Each filesystem will be upgraded automatically when remounted, or when new files are created under that filesystem. The upgrade can also be started manually on filesystems by running `zfs set version=current &lt;pool/fs&gt;`. The upgrade process runs in the background and may take a while to complete for filesystems containing a large number of files. </pre> </div></div> <p>It implies that as soon as the old filesystem is mounted, the feature will be enabled and then the pool can't be downgraded. I'll test this.</p> <p>It doesn't auto-upgrade; So I'll work up a patch in the vein Andreas recommended.</p> <p>Nathaniel Clark (nathaniel.l.clark@intel.com) uploaded a new patch: <a href="https://review.whamcloud.com/28924" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/28924</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-9960" title="Rolling downgrade master to 2.10 - unable to import zpools" class="issue-link" data-issue-key="LU-9960"><del>LU-9960</del></a> osd-zfs: don't auto-upgrade quota<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: 1<br/> Commit: 20b43b86686696e02d5a8f549b412b8496a71e13</p> <p>Minh Diep (minh.diep@intel.com) uploaded a new patch: <a href="https://review.whamcloud.com/28954" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/28954</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-9960" title="Rolling downgrade master to 2.10 - unable to import zpools" class="issue-link" data-issue-key="LU-9960"><del>LU-9960</del></a> osd-zfs: don't auto-upgrade quota<br/> Project: fs/lustre-release<br/> Branch: b2_10<br/> Current Patch Set: 1<br/> Commit: 22060779e670119293db38941ee318e747efc0fa</p> <p>John L. Hammond (john.hammond@intel.com) merged in patch <a href="https://review.whamcloud.com/28954/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/28954/</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-9960" title="Rolling downgrade master to 2.10 - unable to import zpools" class="issue-link" data-issue-key="LU-9960"><del>LU-9960</del></a> osd-zfs: don't auto-upgrade quota<br/> Project: fs/lustre-release<br/> Branch: b2_10<br/> Current Patch Set: <br/> Commit: c62476e202d7bd31e959b9682292319d20dd4dce</p> <p>Oleg Drokin (oleg.drokin@intel.com) merged in patch <a href="https://review.whamcloud.com/28924/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/28924/</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-9960" title="Rolling downgrade master to 2.10 - unable to import zpools" class="issue-link" data-issue-key="LU-9960"><del>LU-9960</del></a> osd-zfs: don't auto-upgrade quota<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: <br/> Commit: bb6ed7dcde71b3878402f1ad4c2d88bc8edd8557</p> <p>Landed for 2.11</p> Related LU-7991 LU-10016 Development Rank 1|hzzjun: Rank (Obsolete) 9223372036854775807 Severity