== sanity test 101b: check stride-io mode read-ahead =========================================================================== 21:28:51 (1781227731)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.706374s, 4.91604MB/s
Read-ahead success for size 8192

1.830559s, 4.58254MB/s
Read-ahead success for size 16384

1.727872s, 4.85488MB/s
Read-ahead success for size 32768

1.641304s, 5.11094MB/s
Read-ahead success for size 65536

1.221038s, 6.87006MB/s
Read-ahead success for size 131072

1.309616s, 6.4054MB/s
Read-ahead success for size 262144

1.495706s, 5.60846MB/s
Read-ahead success for size 524288

1.185553s, 7.07569MB/s
Read-ahead success for size 1048576