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 -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html