| Hi All, We recently experienced a failure with our 12.2.4 cluster running a CephFS instance that resulted in some data loss due to a seemingly problematic OSD blocking IO on its PGs. We restarted the (single active) mds daemon during this, which caused damage due to the journal not having the chance to flush back. We reset the journal, session table, and fs to bring the filesystem online. We then removed some directories/inodes that were causing the cluster to report damaged metadata (and were otherwise visibly broken by navigating the filesystem). With that, there are now some paths that seem to have been orphaned (which we expected). We did not run the ‘cephfs-data-scan’ tool [0] in the name of getting the system back online ASAP. Now that the filesystem is otherwise stable, can we initiate a scan_links operation with the mds active safely? [0] http://docs.ceph.com/docs/luminous/cephfs/disaster-recovery/#recovery-from-missing-metadata-objects Thanks much, Ryan Leimenstoll University of Maryland Institute for Advanced Computer Studies |
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