== sanity test 101b: check stride-io mode read-ahead =========================================================================== 18:49:35 (1787784575)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.980926s, 4.23469MB/s
Read-ahead success for size 8192

2.367624s, 3.54305MB/s
Read-ahead success for size 16384

2.889189s, 2.90345MB/s
Read-ahead success for size 32768

2.386924s, 3.5144MB/s
Read-ahead success for size 65536

2.005975s, 4.18181MB/s
Read-ahead success for size 131072

1.293598s, 6.48471MB/s
Read-ahead success for size 262144

1.270392s, 6.60317MB/s
Read-ahead success for size 524288

1.681579s, 4.98853MB/s
Read-ahead success for size 1048576