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...lib,space_cache) My question, what I believed will help to avoid this long flush : * Have some way to force this flush all in memory cache and then use the btrfs background process to flush to disk ... Security and recover aren''t a priority for now, because this is part of a database bulkload ...after finish , integrity will be desirable (not a obligation, since this is a test environment) For now, performance is the mainly requirement... A plus : root@jdivm06:/proc/sys/fs# cat /proc/sys/vm/dirty_ratio 50 root@jdivm06:/proc/sys/fs# cat /proc/sys/vm/dirty_background_ratio 10 Thanks C...