== sanity test 101b: check stride-io mode read-ahead =========================================================================== 06:37:32 (1786185452)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.428082s, 5.87404MB/s
Read-ahead success for size 8192

1.169689s, 7.17166MB/s
Read-ahead success for size 16384

1.635473s, 5.12916MB/s
Read-ahead success for size 32768

1.432799s, 5.8547MB/s
Read-ahead success for size 65536

1.026308s, 8.17358MB/s
Read-ahead success for size 131072

0.981128s, 8.54996MB/s
Read-ahead success for size 262144

1.091158s, 7.6878MB/s
Read-ahead success for size 524288

0.882554s, 9.50492MB/s
Read-ahead success for size 1048576