== sanity test 101b: check stride-io mode read-ahead =========================================================================== 18:22:19 (1786746139)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

2.743548s, 3.05758MB/s
Read-ahead success for size 8192

2.307684s, 3.63508MB/s
Read-ahead success for size 16384

1.414358s, 5.93104MB/s
Read-ahead success for size 32768

2.032993s, 4.12624MB/s
Read-ahead success for size 65536

2.088639s, 4.0163MB/s
Read-ahead success for size 131072

1.779129s, 4.71501MB/s
Read-ahead success for size 262144

1.361117s, 6.16303MB/s
Read-ahead success for size 524288

1.688368s, 4.96847MB/s
Read-ahead success for size 1048576