== sanity test 101b: check stride-io mode read-ahead =========================================================================== 16:10:59 (1781208659)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.109418s, 7.56127MB/s
Read-ahead success for size 8192

0.852380s, 9.84139MB/s
Read-ahead success for size 16384

1.103858s, 7.59935MB/s
Read-ahead success for size 32768

0.841643s, 9.96694MB/s
Read-ahead success for size 65536

0.766716s, 10.941MB/s
Read-ahead success for size 131072

0.761846s, 11.0109MB/s
Read-ahead success for size 262144

0.633530s, 13.2411MB/s
Read-ahead success for size 524288

0.549788s, 15.2579MB/s
Read-ahead success for size 1048576