== sanity test 101b: check stride-io mode read-ahead =========================================================================== 22:05:34 (1788746734)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.226857s, 6.83748MB/s
Read-ahead success for size 8192

1.677417s, 5.00091MB/s
Read-ahead success for size 16384

1.486969s, 5.64141MB/s
Read-ahead success for size 32768

1.490936s, 5.6264MB/s
Read-ahead success for size 65536

1.269559s, 6.6075MB/s
Read-ahead success for size 131072

1.544823s, 5.43014MB/s
Read-ahead success for size 262144

1.094820s, 7.66209MB/s
Read-ahead success for size 524288

1.032390s, 8.12543MB/s
Read-ahead success for size 1048576