== sanity test 101b: check stride-io mode read-ahead =========================================================================== 06:44:20 (1789123460)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.842546s, 4.55273MB/s
Read-ahead success for size 8192

1.763117s, 4.75783MB/s
Read-ahead success for size 16384

1.746940s, 4.80189MB/s
Read-ahead success for size 32768

1.414071s, 5.93224MB/s
Read-ahead success for size 65536

1.257060s, 6.6732MB/s
Read-ahead success for size 131072

1.051157s, 7.98036MB/s
Read-ahead success for size 262144

1.175150s, 7.13833MB/s
Read-ahead success for size 524288

1.112213s, 7.54227MB/s
Read-ahead success for size 1048576