Hi all, Just a heads up: we're observing very long IO stalls (10s of seconds) on OSDs using bfq in the 4.18.0-348* kernel -- especially during deep-scrubbing, but we've seen on different clusters, both hdds and ssd OSDs. The stalls are often long enough for the OSD to suicide with a 180s stuck op. Earlier CentOS 8 kernels didn't have this issue. Switching to mq-deadline fixed it for us. Best Regards, Dan _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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