== sanity test 101b: check stride-io mode read-ahead =========================================================================== 12:47:20 (1784047640)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.336214s, 6.27789MB/s
Read-ahead success for size 8192

1.863088s, 4.50253MB/s
Read-ahead success for size 16384

2.542078s, 3.2999MB/s
Read-ahead success for size 32768

2.275763s, 3.68606MB/s
Read-ahead success for size 65536

1.355600s, 6.18811MB/s
Read-ahead success for size 131072

1.850056s, 4.53425MB/s
Read-ahead success for size 262144

1.370219s, 6.12209MB/s
Read-ahead success for size 524288

1.656148s, 5.06513MB/s
Read-ahead success for size 1048576