== sanity test 101b: check stride-io mode read-ahead =========================================================================== 11:43:06 (1780328586)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.593212s, 5.26522MB/s
Read-ahead success for size 8192

2.003417s, 4.18715MB/s
Read-ahead success for size 16384

2.335201s, 3.59224MB/s
Read-ahead success for size 32768

1.528321s, 5.48877MB/s
Read-ahead success for size 65536

1.390057s, 6.03472MB/s
Read-ahead success for size 131072

1.283849s, 6.53395MB/s
Read-ahead success for size 262144

1.046099s, 8.01894MB/s
Read-ahead success for size 524288

1.093213s, 7.67335MB/s
Read-ahead success for size 1048576