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docs: architecture: clarify scrubbing

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Signed-off-by: Oluf Lorenzen <lorenzen@b1-systems.de>
Co-Authored-By: Jens Sandmann <25345569+B1Sandmann@users.noreply.github.com>
Co-Authored-By: Jens Sandmann <sandmann@b1-systems.de>
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Oluf Lorenzen 2020-01-16 16:33:19 +01:00 committed by Oluf Lorenzen
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doc/architecture.rst
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@ -370,13 +370,13 @@ ability to leverage this computing power leads to several major benefits:
OSDs`_ and `Heartbeats`_ for additional details.
#. **Data Scrubbing:** As part of maintaining data consistency and cleanliness,
Ceph OSD Daemons can scrub objects within placement groups. That is, Ceph
OSD Daemons can compare object metadata in one placement group with its
replicas in placement groups stored on other OSDs. Scrubbing (usually
performed daily) catches bugs or filesystem errors. Ceph OSD Daemons also
perform deeper scrubbing by comparing data in objects bit-for-bit. Deep
scrubbing (usually performed weekly) finds bad sectors on a drive that
weren't apparent in a light scrub. See `Data Scrubbing`_ for details on
Ceph OSD Daemons can scrub objects. That is, Ceph OSD Daemons can compare
their local objects metadata with its replicas stored on other OSDs. Scrubbing
happens on a per-Placement Group base. Scrubbing (usually performed daily)
catches mismatches in size and other metadata. Ceph OSD Daemons also perform deeper
scrubbing by comparing data in objects bit-for-bit with their checksums.
Deep scrubbing (usually performed weekly) finds bad sectors on a drive that
weren't apparent in a light scrub. See `Data Scrubbing`_ for details on
configuring scrubbing.
#. **Replication:** Like Ceph Clients, Ceph OSD Daemons use the CRUSH