Adding some few extra details for clarity: We've attempted to reset the snap table during the first graceful recovery using: - cephfs-table-tool filesystem:0 reset session There has only been 1 active MDS for this filesystem. > We've sadly attempted to restore the root, which made the entire filesystem tree stray. - cephfs-data-scan --filesystem filesystem init This has been a stupid thing to try in retrospective. The initial crash has been caused due to increased load during scrubbing which brought the MDS to a halt. Issuing ceph mds fail caused the initial journal corruption which was mostly atime modifications and some non-critical data. Following a scrub and fix, everything seemed fine until the next time the MDS was switched, where the previous crash kept happening. -- Alex D. RedXen System & Infrastructure Administration https://redxen.eu/
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