== sanity test 101b: check stride-io mode read-ahead =========================================================================== 15:22:11 (1786821731)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.893282s, 4.43072MB/s
Read-ahead success for size 8192

1.516786s, 5.53052MB/s
Read-ahead success for size 16384

1.510327s, 5.55417MB/s
Read-ahead success for size 32768

1.567300s, 5.35227MB/s
Read-ahead success for size 65536

1.417245s, 5.91895MB/s
Read-ahead success for size 131072

1.287582s, 6.51501MB/s
Read-ahead success for size 262144

1.036099s, 8.09634MB/s
Read-ahead success for size 524288

1.122302s, 7.47447MB/s
Read-ahead success for size 1048576