== sanity test 101b: check stride-io mode read-ahead =========================================================================== 20:34:54 (1786408494)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

1.566024s, 5.35663MB/s
Read-ahead success for size 8192

1.998272s, 4.19793MB/s
Read-ahead success for size 16384

2.188688s, 3.83271MB/s
Read-ahead success for size 32768

1.911227s, 4.38912MB/s
Read-ahead success for size 65536

2.172556s, 3.86117MB/s
Read-ahead success for size 131072

1.615413s, 5.19286MB/s
Read-ahead success for size 262144

1.457182s, 5.75673MB/s
Read-ahead success for size 524288

1.252939s, 6.69514MB/s
Read-ahead success for size 1048576