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