Absolutely not. Please don't do this. None of the CephFS disaster recovery tooling in any way plays nicely with a live filesystem.
I haven't looked at these docs in a while, are they not crystal clear about all these operations being offline and in every way dangerous? :/
-Greg
On Mon, May 7, 2018 at 12:50 PM Ryan Leimenstoll <rleimens@xxxxxxxxxxxxxx> wrote:
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-objectsThanks much,Ryan LeimenstollUniversity of Maryland Institute for Advanced Computer Studies
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