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