== sanity test 101b: check stride-io mode read-ahead =========================================================================== 01:37:02 (1787117822)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.766593s, 4.74847MB/s
Read-ahead success for size 8192

2.076617s, 4.03955MB/s
Read-ahead success for size 16384

2.504436s, 3.3495MB/s
Read-ahead success for size 32768

2.167514s, 3.87015MB/s
Read-ahead success for size 65536

1.860232s, 4.50944MB/s
Read-ahead success for size 131072

1.408658s, 5.95504MB/s
Read-ahead success for size 262144

1.383914s, 6.06151MB/s
Read-ahead success for size 524288

1.611363s, 5.20591MB/s
Read-ahead success for size 1048576