== sanity test 101b: check stride-io mode read-ahead =========================================================================== 02:54:16 (1786949656)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.902977s, 4.40815MB/s
Read-ahead success for size 8192

1.800474s, 4.65911MB/s
Read-ahead success for size 16384

2.206108s, 3.80245MB/s
Read-ahead success for size 32768

1.636979s, 5.12444MB/s
Read-ahead success for size 65536

1.509778s, 5.55619MB/s
Read-ahead success for size 131072

1.297256s, 6.46642MB/s
Read-ahead success for size 262144

1.203667s, 6.96921MB/s
Read-ahead success for size 524288

1.282693s, 6.53984MB/s
Read-ahead success for size 1048576