== sanity test 101b: check stride-io mode read-ahead =========================================================================== 05:07:24 (1789117644)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

2.310052s, 3.63135MB/s
Read-ahead success for size 8192

2.614023s, 3.20908MB/s
Read-ahead success for size 16384

2.573666s, 3.2594MB/s
Read-ahead success for size 32768

2.029257s, 4.13383MB/s
Read-ahead success for size 65536

2.863788s, 2.9292MB/s
Read-ahead success for size 131072

1.844157s, 4.54875MB/s
Read-ahead success for size 262144

1.846333s, 4.54339MB/s
Read-ahead success for size 524288

1.583066s, 5.29896MB/s
Read-ahead success for size 1048576