Bluestore aio_nr?

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Hi,
     I just hit an OSD cannot start due to insufficient aio_nr.  Each
OSD is with a separate SSD partition as db.block
     Further checking showing 6144 AIO contexts were required per OSD,
 could anyone explain a little bit on where the 6144 aio contexts goes
to?

     It looks to me like the bdev_aio_max_queue_depth is default to
1024, but  how can we have 6 bdev to get 6144?

Xiaoxi
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