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Scrub internals and diagnostics
===============================
Scrubbing Behavior Table
------------------------
+-------------------------------------------------+----------+-----------+---------------+----------------------+
| Flags | none | noscrub | nodeep_scrub | noscrub/nodeep_scrub |
+=================================================+==========+===========+===============+======================+
| Periodic tick | S | X | S | X |
+-------------------------------------------------+----------+-----------+---------------+----------------------+
| Periodic tick after osd_deep_scrub_interval | D | D | S | X |
+-------------------------------------------------+----------+-----------+---------------+----------------------+
| Initiated scrub | S | S | S | S |
+-------------------------------------------------+----------+-----------+---------------+----------------------+
| Initiated scrub after osd_deep_scrub_interval | D | D | S | S |
+-------------------------------------------------+----------+-----------+---------------+----------------------+
| Initiated deep scrub | D | D | D | D |
+-------------------------------------------------+----------+-----------+---------------+----------------------+
- X = Do nothing
- S = Do regular scrub
- D = Do deep scrub
State variables
---------------
- Periodic tick state is !must_scrub && !must_deep_scrub && !time_for_deep
- Periodic tick after osd_deep_scrub_interval state is !must_scrub && !must_deep_scrub && time_for_deep
- Initiated scrub state is must_scrub && !must_deep_scrub && !time_for_deep
- Initiated scrub after osd_deep_scrub_interval state is must scrub && !must_deep_scrub && time_for_deep
- Initiated deep scrub state is must_scrub && must_deep_scrub
Scrub Reservations
------------------
An OSD daemon command dumps total local and remote reservations::
ceph daemon osd.<id> dump_scrub_reservations
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