Hi All, I have a galera cluster running on openstack with data on ceph volumes capped at 1500 iops for read and write ( 3000 total ). I can?t understand why with fio I can reach 1500 iops without IOwait and MySQL can reach only 150 iops both read or writes showing 30% of IOwait. I tried with fio 64k block size and various io depth ( 1.2.4.8.16?.128) and I can?t reproduce the problem. Anyone can tell me where I?m wrong? Thank you Regards Matteo
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