484[1]: 1539341832.963780 READ 0x115000 thru 0x11dfff (0x9000 bytes)
485[0]: 1539341832.965575 MAPWRITE 0x1da000 thru 0x1dc970 (0x2971 bytes)
486[0]: 1539341832.968063 WRITE 0x308000 thru 0x309fff (0x2000 bytes) HOLE
487[1]: 1539341832.970006 WRITE 0x667000 thru 0x673fff (0xd000 bytes) HOLE
488[0]: 1539341832.974224 WRITE 0x20a000 thru 0x216fff (0xd000 bytes)
489[0]: 1539341832.976560 READ 0x221000 thru 0x223fff (0x3000 bytes)
490[0]: 1539341832.978306 READ 0x221000 thru 0x222fff (0x2000 bytes)
491[0]: 1539341832.978789 MAPREAD 0x240000 thru 0x24c5a3 (0xc5a4 bytes)
492[1]: 1539341832.987425 READ 0x234000 thru 0x237fff (0x4000 bytes)
493[1]: 1539341832.990920 WRITE 0xb4000 thru 0xc1fff (0xe000 bytes)
Correct content saved for comparison
(maybe hexdump "/mnt/lustre/f16a.sanityn" vs "/mnt/lustre/f16a.sanityn.fsxgood")
sanityn test_16a: @@@@@@ FAIL: fsx with O_DIRECT failed.