Hi Grateful if someone could clarify some things about CephFS Scrubs: 1) Am I right that a command such as "ceph tell mds.cephfs:0 scrub start / recursive" only triggers a forward scrub (not a backward scrub)? 2) I couldn't find any reference to forward scrubs being done automatically and was wondering whether I should do them using cron? But then I saw an undated (but I think a little elderly) presentation by Greg Farnum that states that "forward scrub...runs continuously in the background". Is that still correct (for Quincy), and if so what controls the frequency? 3) Are backward scrubs always manual, using the 3 cephfs-data-scan phases? 4) Are regular backward scrubs recommended, or only if there is indication of a problem? (With due regard to the amount of time they may take...) Thanks for any advice. Regards, Chris