== sanity test 101b: check stride-io mode read-ahead =========================================================================== 23:02:33 (1787367753)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.642150s, 5.10831MB/s
Read-ahead success for size 8192

2.072705s, 4.04718MB/s
Read-ahead success for size 16384

2.120396s, 3.95615MB/s
Read-ahead success for size 32768

1.511672s, 5.54922MB/s
Read-ahead success for size 65536

1.123410s, 7.46709MB/s
Read-ahead success for size 131072

1.124855s, 7.4575MB/s
Read-ahead success for size 262144

1.039041s, 8.07341MB/s
Read-ahead success for size 524288

1.214137s, 6.90911MB/s
Read-ahead success for size 1048576