== sanity test 101b: check stride-io mode read-ahead =========================================================================== 20:22:52 (1786753372)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

2.139255s, 3.92128MB/s
Read-ahead success for size 8192

1.651460s, 5.07951MB/s
Read-ahead success for size 16384

2.270087s, 3.69528MB/s
Read-ahead success for size 32768

2.074571s, 4.04354MB/s
Read-ahead success for size 65536

1.667597s, 5.03036MB/s
Read-ahead success for size 131072

1.439401s, 5.82785MB/s
Read-ahead success for size 262144

1.544662s, 5.43071MB/s
Read-ahead success for size 524288

1.106049s, 7.5843MB/s
Read-ahead success for size 1048576