== sanity test 101b: check stride-io mode read-ahead =========================================================================== 02:55:53 (1789023353)
striped dir -i1 -c2 -H all_char  /mnt/lustre/d101b.sanity

1.829550s, 4.58507MB/s
Read-ahead success for size 8192

1.493597s, 5.61638MB/s
Read-ahead success for size 16384

1.851315s, 4.53116MB/s
Read-ahead success for size 32768

1.560814s, 5.37451MB/s
Read-ahead success for size 65536

1.315706s, 6.37575MB/s
Read-ahead success for size 131072

1.477005s, 5.67947MB/s
Read-ahead success for size 262144

1.246448s, 6.73001MB/s
Read-ahead success for size 524288

0.729357s, 11.5014MB/s
Read-ahead success for size 1048576