== sanity test 101b: check stride-io mode read-ahead =========================================================================== 06:42:08 (1787740928)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.425046s, 5.88655MB/s
Read-ahead success for size 8192

1.834862s, 4.57179MB/s
Read-ahead success for size 16384

1.835598s, 4.56996MB/s
Read-ahead success for size 32768

1.536355s, 5.46007MB/s
Read-ahead success for size 65536

1.389939s, 6.03523MB/s
Read-ahead success for size 131072

1.268934s, 6.61075MB/s
Read-ahead success for size 262144

1.332973s, 6.29316MB/s
Read-ahead success for size 524288

1.050627s, 7.98438MB/s
Read-ahead success for size 1048576