== sanity test 101b: check stride-io mode read-ahead =========================================================================== 20:12:48 (1789431168)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.833386s, 4.57547MB/s
Read-ahead success for size 8192

1.117285s, 7.50803MB/s
Read-ahead success for size 16384

1.575769s, 5.3235MB/s
Read-ahead success for size 32768

1.594748s, 5.26015MB/s
Read-ahead success for size 65536

1.405387s, 5.9689MB/s
Read-ahead success for size 131072

1.112067s, 7.54326MB/s
Read-ahead success for size 262144

0.906965s, 9.2491MB/s
Read-ahead success for size 524288

1.266701s, 6.62241MB/s
Read-ahead success for size 1048576