Why a lot of pgs are degraded after host(+osd) restarted?

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Hi all,

While I am testing host failover, there are a lot of degraded pg after
host(+osd) is up. In spite that it takes a short time to restart, I don't
understand why pg should check all objects related to the failed host(+osd).
I'd like to know how to prevent to become degraded pg when osd restart.

FYI. degraded pg means "active+undersized+degraded+remapped+backfilling" pg
state
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