== sanity test 101b: check stride-io mode read-ahead =========================================================================== 04:51:58 (1787388718)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

2.127067s, 3.94374MB/s
Read-ahead success for size 8192

1.810615s, 4.63302MB/s
Read-ahead success for size 16384

2.521697s, 3.32657MB/s
Read-ahead success for size 32768

1.952687s, 4.29593MB/s
Read-ahead success for size 65536

1.511448s, 5.55005MB/s
Read-ahead success for size 131072

1.303458s, 6.43566MB/s
Read-ahead success for size 262144

1.270380s, 6.60323MB/s
Read-ahead success for size 524288

0.992376s, 8.45305MB/s
Read-ahead success for size 1048576