== sanity test 101b: check stride-io mode read-ahead =========================================================================== 09:13:18 (1787836398)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.269562s, 6.60748MB/s
Read-ahead success for size 8192

1.546139s, 5.42552MB/s
Read-ahead success for size 16384

1.309748s, 6.40475MB/s
Read-ahead success for size 32768

1.430760s, 5.86304MB/s
Read-ahead success for size 65536

1.523995s, 5.50435MB/s
Read-ahead success for size 131072

1.398980s, 5.99623MB/s
Read-ahead success for size 262144

1.080658s, 7.7625MB/s
Read-ahead success for size 524288

1.083025s, 7.74553MB/s
Read-ahead success for size 1048576