== sanity test 101b: check stride-io mode read-ahead =========================================================================== 19:28:51 (1781220531)
striped dir -i1 -c2 -H crush  /mnt/lustre/d101b.sanity

2.013289s, 4.16662MB/s
Read-ahead success for size 8192

2.192420s, 3.82619MB/s
Read-ahead success for size 16384

2.595389s, 3.23212MB/s
Read-ahead success for size 32768

2.411970s, 3.47791MB/s
Read-ahead success for size 65536

1.698189s, 4.93974MB/s
Read-ahead success for size 131072

1.543199s, 5.43586MB/s
Read-ahead success for size 262144

1.335057s, 6.28333MB/s
Read-ahead success for size 524288

1.511523s, 5.54977MB/s
Read-ahead success for size 1048576