== sanity test 101b: check stride-io mode read-ahead =========================================================================== 02:03:36 (1785391416)
striped dir -i1 -c2 -H all_char  /mnt/lustre/d101b.sanity

1.778015s, 4.71796MB/s
Read-ahead success for size 8192

1.863426s, 4.50171MB/s
Read-ahead success for size 16384

3.154460s, 2.65928MB/s
Read-ahead success for size 32768

1.592749s, 5.26675MB/s
Read-ahead success for size 65536

2.324598s, 3.60863MB/s
Read-ahead success for size 131072

1.792946s, 4.67867MB/s
Read-ahead success for size 262144

1.226880s, 6.83735MB/s
Read-ahead success for size 524288

1.528296s, 5.48886MB/s
Read-ahead success for size 1048576