Hi, Recent tests on my test rack with 20G IB(iboip, 64k mtu, default CUBIC, CFQ, LSI SAS 2108 w/ wb cache) interconnect shows a quite fantastic performance - on both reads and writes Ceph completely utilizing all disk bandwidth as high as 0.9 of theoretical limit of sum of all bandwidths bearing in mind replication level. The only thing that may bring down overall performance is a O_SYNC|O_DIRECT writes which will be issued by almost every database server in the default setup. Assuming that the database config may be untouchable and somehow I can build very reliable hardware setup which `ll never fail on power, should ceph have an option to ignore these flags? May be there is another real-world cases for including such or I am very wrong even thinking on fool client application in this way.
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