== sanity test 101b: check stride-io mode read-ahead =========================================================================== 18:28:59 (1787783339)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.883404s, 4.45396MB/s
Read-ahead success for size 8192

1.889197s, 4.4403MB/s
Read-ahead success for size 16384

1.906874s, 4.39914MB/s
Read-ahead success for size 32768

1.427049s, 5.87829MB/s
Read-ahead success for size 65536

1.588994s, 5.27919MB/s
Read-ahead success for size 131072

2.235615s, 3.75226MB/s
Read-ahead success for size 262144

1.599923s, 5.24313MB/s
Read-ahead success for size 524288

1.271337s, 6.59826MB/s
Read-ahead success for size 1048576