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mirror_zfs/module/zfs
Alexander Motin f72fd378c8 Defer async destroys on pool import
We've observed a number of cases when pool import stuck for many
minutes due to large async destroy trying to load DDT or BRT from
HDD pool.  While proper destroy dosage is a separate problem,
lets give import process a chance to complete before that at all.
It may be not enough if there is a lot of ZIL to replay, but that
is harder to cover, since those are in separate syscalls.

Code investigation shown that we already have this mechanism used
for scrub/resilver, so this patch converts SCAN_IMPORT_WAIT_TXGS
into a tunable and applies it to async destroys also.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes #18033
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