== sanity test 101b: check stride-io mode read-ahead =========================================================================== 11:10:32 (1786633832)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.748456s, 4.79772MB/s
Read-ahead success for size 8192

1.820662s, 4.60745MB/s
Read-ahead success for size 16384

1.943330s, 4.31662MB/s
Read-ahead success for size 32768

2.008916s, 4.17569MB/s
Read-ahead success for size 65536

1.589436s, 5.27773MB/s
Read-ahead success for size 131072

1.586984s, 5.28588MB/s
Read-ahead success for size 262144

1.463101s, 5.73344MB/s
Read-ahead success for size 524288

1.511104s, 5.55131MB/s
Read-ahead success for size 1048576