== sanity test 101b: check stride-io mode read-ahead =========================================================================== 02:31:29 (1778653889)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

0.862989s, 9.72041MB/s
Read-ahead success for size 8192

0.975535s, 8.59898MB/s
Read-ahead success for size 16384

1.171014s, 7.16354MB/s
Read-ahead success for size 32768

1.012661s, 8.28373MB/s
Read-ahead success for size 65536

0.792074s, 10.5907MB/s
Read-ahead success for size 131072

0.701660s, 11.9554MB/s
Read-ahead success for size 262144

0.747811s, 11.2176MB/s
Read-ahead success for size 524288

0.593737s, 14.1285MB/s
Read-ahead success for size 1048576