Alert rule: CephPGNotScrubbed

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Overview

One or more PGs haven’t been scrubbed recently. Scrubs check metadata integrity, protecting against bit-rot. They check that metadata is consistent across data replicas. When PGs miss their scrub interval, it may indicate that the scrub window is too small, or PGs weren’t in a clean state during the scrub window.

Steps for debugging

Initiate a scrub

$ ceph_cluster_ns=syn-rook-ceph-cluster
$ kubectl -n ${ceph_cluster_ns} exec -it deploy/rook-ceph-tools -- ceph health detail
$ kubectl -n ${ceph_cluster_ns} exec -it deploy/rook-ceph-tools -- ceph pg scrub <PG_ID_FROM_ALERT>

Upstream documentation

docs.ceph.com/en/latest/rados/operations/health-checks#pg-not-scrubbed