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doc/architecture: edit "Data Scrubbing"

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Edit the "Data Scrubbing" listitem in the list of benefits conferred by
the use by OSDs of the aggregate power of the cluster, in the section
"Smart Daemons Enable Hyperscale" in doc/architecture.rst.

Co-authored-by: Anthony D'Atri <anthony.datri@gmail.com>
Signed-off-by: Zac Dover <zac.dover@proton.me>
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Zac Dover 2023-09-29 04:40:08 +10:00
parent 6d8679ebcd
commit d7b991646f
1 changed files with 9 additions and 9 deletions
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doc/architecture.rst
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@ -420,15 +420,15 @@ the greater cluster provides several benefits:
lightweight processes. See `Monitoring OSDs`_ and `Heartbeats`_ for
additional details.
#. **Data Scrubbing:** As part of maintaining data consistency and cleanliness,
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.
#. **Data Scrubbing:** To maintain data consistency, Ceph OSD Daemons scrub
RADOS objects. Ceph OSD Daemons compare the metadata of their own local
objects against the metadata of the replicas of those objects, which are
stored on other OSDs. Scrubbing occurs on a per-Placement-Group basis, finds
mismatches in object size and finds metadata mismatches, and is usually
performed daily. Ceph OSD Daemons perform deeper scrubbing by comparing the
data in objects, bit-for-bit, against their checksums. Deep scrubbing finds
bad sectors on drives that are not detectable with light scrubs. See `Data
Scrubbing`_ for details on configuring scrubbing.
#. **Replication:** Like Ceph Clients, Ceph OSD Daemons use the CRUSH
algorithm, but the Ceph OSD Daemon uses it to compute where replicas of